Benjamin S. Williams

University of California at Los Angeles (UCLA) Professor

Department of Electrical and Computer Engineering UCLA HSSEAS Samueli Fellow

California NanoSystems Institute (CNSI)

68-117 Engineering IV Bldg. bswilliams@ucla.edu

420 Westwood Plaza Phone: (310) 825-6961

Box 951594 www.ee.ucla.edu/benjamin-williams/

Los Angeles, CA 90095-1594 www.seas.ucla.edu/~bwilliam

Education Massachusetts Institute of Technology Cambridge, MA

Ph.D. in Electrical Engineering and Computer Science, September 2003.

Thesis: Terahertz quantum cascade lasers.

Massachusetts Institute of Technology Cambridge, MA

M. S. in Electrical Engineering and Computer Science, May 1998.

Thesis: GaAs/AlGaAs Mid-Infrared Quantum Cascade Lasers.

Haverford College Haverford, PA

B. S. with high honors in Physics, May 1996.

Thesis: Mixing of a passive scalar in two-dimensional turbulence.

Research Quantum cascade lasers for the terahertz and mid-infrared

Interests Development of terahertz QCLs for higher temperature operation, lower frequencies, higher efficiencies,

improved beam pattern and spectral purity. Development of mid-IR QCLs for high-power and high wall-

plug efficiencies. Terahertz science, imaging, chemical and biological sensing, and detection.

Sub-wavelength terahertz plasmonics and metamaterials: active metamaterials and metasurfaces, sub-

wavelength metal terahertz waveguides and antennas, distributed feedback structures, structured metallic

surfaces, photonic/ plasmonic crystals, metamaterial lasers, terahertz reflectarrays, 2D material

plasmonics.

Low-dimensional nanostructures for optoelectronic applications: quantum wells, semiconductor

intersubband and intersub-level transport and physics in quantum wells and dots, semiconductor

heterostructure nanowires, quantum wires and dots, nano-lasers, inter-sublevel physics.

Career Professor, UCLA, Department of Electrical and Computer Engineering 2019-present

History Associate Professor, UCLA, Department of Electrical Engineering 2013-2019

Assistant Professor, UCLA, Department of Electrical Engineering 2007-2013

Postdoctoral Associate, MIT, Research Laboratory of Electronics October 2003-October 2006

Advisor: Qing Hu

Research Assistant (Ph.D.), MIT, Dept. EECS August 1998-August 2003

Advisor: Qing Hu

Awards Presidential Early Career Award for Scientists and Engineers (PECASE) 2016

MTT THz Science and Technology Best Paper Award 2013

NSF CAREER Award (2012)

DARPA Young Faculty Award (2008)

UCLA Henry Samueli School of Engineering and Applied Science Fellow

Air Force MURI Fellowship (2000-2003)

American Physical Society (APS) Apker Award for undergraduate thesis (1996)

Professional Societies: IEEE (Senior Member), APS (Member), OSA (Member), SPIE (Member)

Benjamin S. Williams, UCLA CV

- 2 -

Student Awards Luyao Xu – UCLA EE Department Distinguished PhD Dissertation Award in Physical & Wave Electronics (2016-

2017)

Luyao Xu – UCLA Dissertation Year Fellowship 2016/2017

Luyao Xu – Best Student Presentation Award at VECSEL conference, SPIE Photonics West 2016

Luyao Xu – 2015 SPIE Optics and Photonics Education Scholarship

Luyao Xu – 2013 PhD Preliminary Exam Excellent Performance Award (Rank 1st) and Fellowship

Amir Ali Tavallaee – UCLA EE Department Distinguished PhD Dissertation Award in Physical & Wave

Electronics (2012-2013)

Amir Ali Tavallaee – 2007 PhD Preliminary Exam Excellent Performance Award (Rank 1st) and Fellowship

Teaching

EE2H – Physics for Electrical Engineers (Honors, lower division undergrad)

EE101A – Engineering Electrodynamics (upper division undergrad)

EE170C – Photodetectors and Solar Cells (upper division undergrad, created course)

EE172 – Introduction to Lasers and Quantum Electronics (upper division undergrad)

EE270 – Applied Quantum Mechanics (Grad-level)

University and Departmental Service

Chair, Faculty Recruitment Committee, UCLA Department of Electrical and Computer Engineering, July 2018-

present.

Chair, Faculty Executive Committee (FEC) for Henry Samueli School of Engineering and Applied Science, July

2015-June 2017.

Area Director of Physical and Wave Electronics within Electrical Engineering Department (Fall 2014 – June 2017);

coordinated faculty recruitment, graduate student prelim exams, area curriculum, course assignments, student

advising, MS project approvals.

Member HSSEAS Honors and Awards Committee. May 2015.

Member, Faculty Executive Committee (FEC) for Henry Samueli School of Engineering and Applied Science, July

2014-June 2015.

EE Departmental Committees: Courses and Curriculum Committee (2014-2017), Recruitment Committee (2014-

2017), Staff Relations Committee (2014-2015), Admissions Committee (2008, 2009, 2010, 2011).

Faculty advisor to Eta Kappa Nu (IEEE-HKN) chapter at UCLA (Undergraduate Electrical Engineering Honor

Society). (Fall 2013-present).

Created and managed departmental website to coordinate and encourage undergraduate research.

Editorial and Review Service

Associate Editor, IEEE Journal of Quantum Electronics, 2014-2019.

Associate Editor, IEEE Transactions on Terahertz Science and Technology, 2017-present.

Guest Editor, Special issue on Quantum Cascade Lasers, Optics Express, February 2015.

Conference Service

Conference Organization

Chair and Organizer, ITQW 2019 (Infrared Terahertz Quantum Workshop, previously known as Intersubband

Transitions in Quantum Wells), Ojai, CA, September 15-20, 2019. www.itqw2019.com

Co-chair for International Quantum Cascade Lasers School & Workshop 2014, September 2014, Italy.

Organizing committee for Intersubband Transitions in Quantum Wells 2013, September 2013, Bolton Landing, NY.

Workshop chair and organizer for IEEE Photonics Society (formerly LEOS) Semiconductor Laser Workshop, San

Jose, CA May 2010.

Benjamin S. Williams, UCLA CV

- 3 -

Workshop session organizer/chair “Quantum cascade lasers” at IEEE/LEOS Semiconductor Laser Workshop,

Baltimore, MD, June 2009.

Workshop session organizer/chair “Quantum cascade and non-diode lasers” at IEEE/LEOS Semiconductor Laser

Workshop, Long Beach, CA, May 2006.

Technical Program Committees

Member, Technical Program Subcommittee on Semiconductor Lasers, Conference on Lasers and Electro-Optics.

San Jose, CA, 2020 (CLEO 2020).

Member, Technical Program Subcommittee on Terahertz Sources and Applications, Conference on Lasers and

Electro-Optics/Europe and the European Quantum Electronics Conference, June 2019, Munich Germany

(CLEO/Europe-EQEC 2019)

Member, Technical Program Committee, 26th IEEE International Semiconductor Laser Conference (ISLC 2018),

Santa Fe, NM 2018.

Member, Program Committee, International Quantum Cascade Laser School and Workshop 2016 (IQCLSW 2016)

Cambridge, UK 2016

Member, Program Committee, International Conference on Infrared, Millimeter, and Terahertz Waves 2016

(IRMMW-THZ 2016), Copenhagen Denmark September 2016.

Member, Technical Program Subcommittee on Semiconductor Lasers, Conference on Lasers and Electro-Optics.

San Jose, CA, 2013, 2014, 2015 (CLEO 2013, CLEO 2014, CLEO 2015).

Member, Program committee for International Quantum Cascade Lasers School & Workshop (IQCLSW 2012),

September 2-6, 2012, Vienna Austria.

Member, Program committee for Intersubband Transitions in Quantum Wells (ITQW 2011), September 2011,

Sardinia Italy.

Member, Program committee for International Quantum Cascade Lasers School & Workshop (IQCLSW 2010),

August 30-Sept. 3 2010, Florence Italy.

Member, Program committee for International Semiconductor Laser Conference (ISLC 2010) 2010, Kyoto Japan

September 26-30, 2010.

Member, Program committee for Intersubband Transitions in Quantum Wells Conference (ITQW 2009), Montreal,

Canada, September 2009.

Member, Semiconductor Lasers Technical Subcommittee for LEOS Annual meeting 2007-2009,

(Orlando, FL, October 2007, Newport Beach, CA, October 2008, Belek-Antalya, Turkey, October 2009).

Member, Program Committee for OSA topical meeting Optical Terahertz Science and Technology (OTST 2007),

Orlando, FL, March 2007.

Patents

U.S. Patent No. 7,158,545, "Terahertz Lasers and Amplifiers Based on Resonant Optical Phonon Scattering to

Achieve Population Inversion," by Qing Hu and Benjamin S. Williams.

U.S. Patent No. 9,728,930, "Quantum cascade external cavity laser with metasurfaces," Benjamin S. Williams,

Luyao Xu, Daguan Chen.

Patent Application: “Inhomogeneous focusing and broadband metasurface quantum-cascade lasers”

(WO2018067837A1), Benjamin S. Williams, Luyao Xu, Christopher Curwen.

Provisional Patent Application: “Grating-based quantum-cascade vertical external cavity lasers in the terahertz and

mid-infrared”. Benjamin S. Williams, Christopher Curwen. U.S. Provisional Patent Application No.: 62/692,192.

Technical Press Coverage

Phys.org. Research team develops technique to control laser polarization electronically, with no moving parts, April

20, https://phys.org/news/2017-04-team-technique-laser-polarization-electronically.html

Benjamin S. Williams, UCLA CV

- 4 -

“Bright Future for Lasers,” Katherine Kornei, UCLA Engineer Magazine, http://engineering.ucla.edu/future-for-

lasers/ . Story picked up by Phys.org: http://phys.org/news/2016-11-bright-future-lasers.html .

Highlight in SPIE Photonics West 2016 LASE talks sampler “Amplifying metasurface mirrors for THz-QC lasers”

http://spie.org/about-spie/press-room/spie-photonics-west-2016-news-and-photos/lase-talks-sampler-spie-photonics-

west-2016

Physics Today, “Search and Discovery: A quantum cascade laser gets a geometric makeover”. Mark Wilson,

February 2016, vol. 69, issue 2, page 16. http://dx.doi.org/10.1063/PT.3.3070

Physics Today Online: “A quantum cascade laser gets a geometric makeover”. Mark Wilson, December 28 2015.

http://scitation.aip.org/content/aip/magazine/physicstoday/news/10.1063/PT.5.7230

Laser Focus World: “Terahertz Sources: Terahertz QC metasurface VECSEL has near-Gaussian, low-divergence

output”, Gail Overton, 2/1/16, http://www.laserfocusworld.com/articles/print/volume-52/issue-01/world-

news/terahertz-sources-terahertz-qc-metasurface-vecsel-has-near-gaussian-low-divergence-output.html

Semiconductor today “UCLA develops first terahertz VECSEL laser” 12/31/2015 http://www.semiconductor-

today.com/news_items/2015/dec/ucla_311215.shtml

Compoundsemi Online 12/29/15, “UCLA Scientists Develop Terahertz Laser Combining a Metasurface and

VECSEL (not conventional VCSEL)” http://www.compoundsemi.com/ucla-scientists-develop-terahertz-laser-

combining-a-metasurface-and-vecsel-not-conventional-vcsel/

Phys.org: “Researchers develop 'metasurface' laser for terahertz range” Dec 18, 2015

http://phys.org/news/2015-12-metasurface-laser-terahertz-range.html

Photonics.com: “VECSEL Eyed for Terahertz Sensing Applications” Dec 21, 2015.

http://www.photonics.com/Article.aspx?AID=58109

SPIE Newsroom: Benjamin S. Williams, Amir Ali Tavallaee, Philip Hon, and Tatsuo Itoh , “Active terahertz

waveguides based upon transmission-line metamaterials”, August 22 2013,

http://dx.doi.org/10.1117/2.1201308.005081

SPIE Newsroom: Benjamin S. Williams, Amir Ali Tavallaee, Philip Hon, and Tatsuo Itoh, “Metamaterial concepts

applied to terahertz-laser waveguides,” April 11 2011. http://dx.doi.org/10.1117/2.1201103.003597.

Nature Photonics Research Highlights: “Zero-index laser,” Vol 4, July 2010.

http://dx.doi.org/doi:10.1038/nphoton.2010.139 .

Book Chapters

Benjamin S. Williams and Luyao Xu, “Terahertz metasurface quantum-cascade VECSELs,” In Vertical External

Cavity Surface Emitting Laser. VECSEL Technology and Applications, Wiley-VCH (publication expected 2019).

Benjamin S. Williams and Qing Hu, “Terahertz Lasers,” In Encyclopedia of Modern Optics (2nd Edition), Elsevier,

vol. 1, pp. 379-386, 2018. https://doi.org/10.1016/B978-0-12-803581-8.09639-9

Q. Hu, B. S. Williams, S. Kumar, A. W. M. Lee, Q. Qin, J. L. Reno, H. C. Liu, and Z. R. Wasilewski, “Terahertz

Quantum Cascade Lasers and Real-Time T-Ray Imaging,” In Future Trends in Microelectronics: Up the Nano Creek,

Wiley-Interscience, pp. 347-358, 2007.

Q. Hu, B. S. Williams, M. R. Melloch, and J. L. Reno, “Terahertz emitters based on intersubband transitions.” In Future

Trends in Microelectronics: The Nano Millenium, Wiley, New York, pp. 242-52, 2002.

Citation Statistics

Google Scholar: h-index: 37, Total citations: 7724 (3021 since 2013)

Thomson Reuters ResearcherID: h-index: 34, Total citations: 4921

Benjamin S. Williams, UCLA CV

- 5 -

Journal Publications (Refereed)

1. C. A. Curwen, J. L. Reno, and B. S. Williams, “Broadband continuous single-mode tuning of a short-cavity

quantum-cascade VECSEL,” Nature Photonics, September 23, 2019. https://doi.org/10.1038/s41566-019-0518-z

2. B. A. Burnett, A. Pan, C.-O. Chui, B. S. Williams, “Robust Simulation of Terahertz Quantum Cascade Laser

Active Regions,” IEEE Trans. Terahertz Science and Technology, vol. 8, 492-501, September 2018.

http://dx.doi.org/10.1109/TTHZ.2018.2851396

3. C. A. Curwen, J. L. Reno, and B. S. Williams, “Terahertz Quantum Cascade VECSEL with Watt-Level Output

Power,” Applied Physics Letters, vol. 113, 011104, July 2 2018. https://doi.org/10.1063/1.5033910

4. L. Xu, C. A. Curwen, J. L. Reno, and B. S. Williams, “High performance terahertz metasurface quantum-cascade

VECSEL with an intra-cryostat cavity,” Applied Physics Letters, vol. 111, 101101, Sept. 5 2017.

http://dx.doi.org/10.1063/1.4993600 (APL Editor’s Pick)

5. A. Pan, B. A. Burnett, C.-O. Chui, and B. S. Williams, “Density Matrix Modeling of Quantum Cascade Lasers

without an Artificially Localized Basis: A Generalized Scattering Approach,” Physical Review B, vol. 96,

085308, August 15, 2017. https://doi.org/10.1103/PhysRevB.96.085308

6. D. Ren, A. Farrell, B. S. Williams, D. Huffaker, “Seeding Layer Assisted Selective-area Growth of As-rich

InAsP Nanowires on InP Substrates,” Nanoscale, vol. 9, 8220-8228, June 28, 2017.

https://dx.doi.org/10.1039/C7NR00948H

7. L. Xu, C. A. Curwen, D. Chen, J. L. Reno, T. Itoh, and B. S. Williams, “Terahertz metasurface quantum-cascade

VECSELs: theory and performance,” IEEE Journal of Selected Topics in Quantum Electronics, (Invited paper)

vol. 23, 1200512, Nov.-Dec. 2017. https://doi.org/10.1109/JSTQE.2017.2693024 (featured on cover)

8. L. Xu, D. Chen, C. A. Curwen, M. Memarian, J. L. Reno, T. Itoh, and B. S. Williams, “Metasurface quantum-

cascade laser with electrically switchable polarization,” Optica, vol. 4, 468-475 (2017).

https://doi.org/10.1364/OPTICA.4.000468

9. B. A. Burnett and B. S. Williams, “Design strategy for terahertz quantum dot cascade lasers,” Optics Express

vol. 24, 25471-25481, October 31 2016 https://doi.org/10.1364/OE.24.025471

10. L. Xu, D. Chen, T. Itoh, J. L. Reno, and B. S. Williams, “Focusing metasurface quantum-cascade laser with a

near diffraction-limited beam,” Optics Express, vol. 24, 24117-24128 October 17 2016.

https://doi.org/10.1364/OE.24.024117

11. D. A. Chu, P. W. C. Hon, T. Itoh, and B. S. Williams, “Feasibility of graphene CRLH metamaterial waveguides

and leaky wave antennas,” Journal of Applied Physics, vol. 120, 013103, July 2016.

http://dx.doi.org/10.1063/1.4955138

12. B. A. Burnett and B. S. Williams, “Origins of terahertz difference frequency susceptibility in mid-infrared

quantum cascade lasers,” Physical Review Applied, vol. 5, 034013, March 2016.

http://dx.doi.org/10.1103/PhysRevApplied.5.034013

13. L. Xu, P. W. C. Hon, C. Curwen, Q.-S. Chen, T. Itoh, and B. S. Williams, “Metasurface external cavity laser,”

Applied Physics Letters, vol. 107, 221105 (2015) http://dx.doi.org/10.1063/1.4936887 .

14. M. S. Vitiello, G. Scalari, B. S. Williams, and P. DeNatale, “Quantum cascade lasers: 20 years of challenges,”

Optics Express, vol. 23, 5167-5182 (2015) http://dx.doi.org/10.1364/OE.23.005167 .

15. B. A. Burnett and B. S. Williams, "Density matrix model for polarons in a terahertz quantum dot cascade laser,"

Physical Review B, vol. 90, 155309, 2014. http://dx.doi.org/10.1103/PhysRevB.90.155309

16. P. W. C. Hon, Z. Liu, T. Itoh, and B. S. Williams, “Leaky and bound modes in terahertz metasurfaces made of

transmission-line metamaterials,” Journal of Applied Physics vol. 113, 033105, January 18 2013.

http://dx.doi.org/10.1063/1.4776761

17. A. A. Tavallaee, P. W. C. Hon, Q.-S. Chen, T. Itoh, and B. S. Williams, “Active terahertz quantum-cascade

composite right/left-handed metamaterial,” Applied Physics Letters vol. 102, 021103, January 14 2013.

http://dx.doi.org/10.1063/1.4775666

18. P. Senanayake, C.-H. Hung, J. Shapiro, A. Scofield, A. Lin, B. S. Williams, D. L. Huffaker, “3D Nanopillar optical

antenna photodetectors,” Optics Express vol. 20, pp. 25489-25496, November 5 2012.

http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-23-25489

Benjamin S. Williams, UCLA CV

- 6 -

19. P. W. C. Hon, A. A. Tavallaee, Q.-S. Chen, B. S. Williams, and T. Itoh, “Radiation Model for Terahertz

Transmission-Line Metamaterial Quantum-Cascade Lasers,” IEEE Trans. Terahertz Science and Technology vol.

2, no 3, pp. 323-332, May 2012. http://dx.doi.org/10.1109/TTHZ.2012.2191023 Winner of 2013 IEEE

Transactions on THz Science and Technology Best Paper Award.

20. Z. Liu, P. W. C. Hon, A. A. Tavallaee, T. Itoh, and B. S. Williams, “Terahertz composite right/left handed

transmission line metamaterial waveguides,” Applied Physics Letters vol. 100, 071101 Feb 13, 2012.

http://dx.doi.org/10.1063/1.3684250

21. P. Senanayake, C.-H. Hung, J. Shapiro, A. Lin, B. Liang, B. S. Williams, D. Huffaker, “Surface plasmon enhanced

nanopillar photodetectors,” Nano Letters vol 11, pp. 5279-5283, 2011. http://dx.doi.org/10.1021/nl202732r

22. A. A. Tavallaee, B. S. Williams, P. W. C. Hon, T. Itoh, and Qi-Sheng Chen, “Terahertz quantum-cascade laser

with active leaky-wave antenna,” Applied Physics Letters vol. 99, 141115 October 7, 2011.

http://link.aip.org/link/doi/10.1063/1.3648104

23. Y. Ren, J. N. Hovenier, R. Higgins, J. R. Gao, T. M. Klapwijk, S. C. Shi, A. Bell, B. Klein, B. S. Williams, S.

Kumar, Q. Hu, and J. L. Reno, “Terahertz heterodyne spectrometer using a quantum cascade laser,” Applied

Physics Letters, vol. 97, 161105 October 18, 2010.

http://link.aip.org/link/APPLAB/v97/i16/p161105/s1

24. J. Gambari, A. I. Fernandez-Dominguez, S. A. Maier, B. S. Williams, S. Kumar, J. L. Reno, Q. Hu, and C. C.

Phillips, “Thresholdless coherent light scattering from subband polaritons in a strongly coupled microcavity,”

Physical Review B, vol 82, 121303(R) 2010.

http://link.aps.org/doi/10.1103/PhysRevB.82.121303

25. A. A. Tavallaee, P. W. C. Hon, K. Mehta, T. Itoh, and B. S. Williams, “Zero-Index Terahertz Quantum-Cascade

Metamaterial Lasers,” IEEE J. Quantum Electronics, vol. 46, no 7, July 2010, pp 1091-1098.

http://dx.doi.org/10.1109/JQE.2010.2043642. (covered in Nature Photonics, Research Highlights, July 2010 vol

4, pp. 408-409).

26. A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Tunable Terahertz Quantum Cascade Lasers

with External Gratings,” Optics Letters, vol 35, April 1 2010, pp. 910-912.

http://dx.doi.org/10.1364/OL.35.000910

27. C. A. Wang, A. Goyal, R. Huang, J. Donnelly, D. Calawa, G. Turner, A. Sanchez-Rubio, A. Hsu, Q. Hu, B.

Williams, “Strain-compensated GaInAs/AlInAs/InP quantum cascade laser materials,”, J. Crystal Growth, vol.

312, pp.1157-1164 (2009). http://dx.doi.org/10.1016/j.jcrysgro.2009.11.005

28. Q. Qin, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Tuning a terahertz wire laser,” Nature Photonics, vol

3, pp. 732-737 (2009). http://dx.doi.org/10.1038/nphoton.2009.218

29. P. Khosropanah, A. Baryshev, W. Zhang, W. Jellem, J.N. Hovenier, J.R. Gao, T.M. Klapwijk, D.G. Paveliev, B.

S. Williams, S.Kumar, Q. Hu , J. L. Reno, B. Klein, J.L. Hesler , “Phase-locking of a 2.7-THz quantum cascade

laser to a microwave reference,” Optics Letters, vol 34, no 19, Oct 1 2009, pp. 2958-2960.

http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-34-19-2958

30. A. Wade, G. Fedorov, D. Smirnov, S. Kumar, B. S. Williams, Q. Hu & J. L. Reno, “Magnetic-field-assisted

terahertz quantum cascade laser operating up to 225 K.” Nature Photonics, vol 3, Jan 2009, pp. 41-45.

31. G. Scamarcio, M. S. Vitiello, V. Spagnolo, S. Kumar, B. Williams, Q. Hu, “Nanoscale heat transfer in quantum

cascade lasers.” Physica E, vol. 40, April 2008, pp. 1780-1784.

http://dx.doi.org/10.1016/j.physe.2007.09.168

32. A. W. M. Lee, Qi Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, “High-power and high-temperature THz

quantum-cascade lasers based on lens-coupled metal-metal waveguides.” Optics Letters, vol. 32, 1 October 2007,

pp. 2840-2842. http://dx.doi.org/10.1364/OL.32.002840

33. Benjamin S. Williams, “Terahertz quantum cascade lasers.” Nature Photonics, vol. 1, September 2007, pp. 517-

525. (review article, > 800 citations) http://dx.doi.org/10.1038/nphoton.2007.166

34. S. Kumar, B. S. Williams, Qi Qin, A. W. M. Lee, Q. Hu and J. L. Reno, “Surface-emitting distributed feedback

terahertz quantum-cascade lasers in metal-metal waveguides.” Optics Express, vol. 15, 8 January 2007, pp. 113.

http://www.opticsinfobase.org/abstract.cfm?URI=oe-15-1-113

Benjamin S. Williams, UCLA CV

- 7 -

35. A. W. M. Lee, Qi Qin, S. Kumar, B. S. Williams, Q. Hu and J. L. Reno, “Real-time terahertz imaging over a

standoff distance (>25 meters).” Applied Physics Letters, vol. 89, 2 October 2006, pp. 141125.

http://link.aip.org/link/?APPLAB/89/141125/1

36. A. Baryshev, J. N. Hovenier, A. J. L. Adam, I. Kašalynas, J. R. Gao, T. O. Klaassen, B. S. Williams, S. Kumar, Q.

Hu, and J. L. Reno, “Phase-locking and spectral linewidth of a two-mode terahertz quantum cascade laser.” Applied

Physics Letters, vol. 89, 17 July 2006, pp. 031115.

http://link.aip.org/link/?APPLAB/89/031115/1 (Reprinted in Virtual Journal of Nanoscale Science and

Technology)

37. B. S. Williams, S. Kumar, Q. Qin, Q. Hu and J. L. Reno, “Terahertz quantum-cascade lasers with double resonant-

phonon depopulation.” Applied Physics Letters, vol. 88, 26 June 2006, pp. 261101.

http://link.aip.org/link/?APPLAB/88/261101/1

38. A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu and J. L. Reno, “Real-time imaging using a 4.3-THz quantum

cascade laser and a 320×240 microbolometer focal-plane array.” Photonics Technology Letters, vol. 18, no. 13, 1

July 2006, pp. 1415-1417. http://dx.doi.org/10.1109/LPT.2006.877220 (featured on cover)

39. E. E. Orlova, J. N. Hovenier, T. O. Klaassen, I. Kasalynas, A. J. L. Adam, J. R. Gao, T. M. Klapwijk, B. S.

Williams, S. Kumar, Q. Hu, and J. L. Reno, “Antenna model for wire lasers.” Physical Review Letters, vol. 96, 5

May 2006, pp. 173904. http://link.aps.org/doi/10.1103/PhysRevLett.96.173904 (Reprinted in Virtual Journal of

Nanoscale Science and Technology)

40. A. J. L. Adam, I. Kašalynas, J. N. Hovenier, T. O. Klaassen, J. R. Gao, E. E. Orlova, B. S. Williams, S. Kumar, Q.

Hu, and J. L. Reno, “Beam pattern of terahertz quantum cascade lasers with subwavelength cavity dimensions.”

Applied Physics Letters. 88, no. 15, 10 April 2006, pp. 151105.

http://link.aip.org/link/?APPLAB/88/151105/1

41. (Reprinted in Virtual Journal of Nanoscale Science and Technology)S. Kumar, B. S. Williams, Q. Hu and J. L.

Reno, “1.9-THz quantum-cascade lasers with one-well injector.” Applied Physics Letters, vol. 88, no. 12, 20 March

2006, pp. 121123. http://link.aip.org/link/?APPLAB/88/121123/1

42. B. S. Williams, S. Kumar, Q. Hu and J. L. Reno, “High-power terahertz quantum-cascade lasers.” Electronics

Letters, vol. 42, no. 2, 19 January 2006, pp. 89-90. http://dx.doi.og/10.1049/el:20063921

43. B. S. Williams, S. Kumar, Q. Hu and J. L. Reno, “Distributed-feedback terahertz quantum-cascade lasers with

laterally corrugated metal waveguides.” Optics Letters, vol. 30, no. 21, November 2005, pp. 2909.

http://dx.doi.org/10.1364/OL.30.002909

44. H. C. Liu, M. Wächter, D. Ban, Z. R. Wasilewski, M. Buchanan, G. C. Aers, J. C. Cao, S. L. Feng, B. S. Williams,

and Q. Hu, “Effect of doping concentration on the performance of terahertz quantum-cascade lasers.” Applied

Physics Letters, vol. 87, 3 October 2005, pp. 141102.

http://link.aip.org/link/?APPLAB/87/141102/1

45. Q. Hu, B. S. Williams, S. Kumar, H. Callebaut, S. Kohen, and J. L. Reno, “Resonant-phonon-assisted THz

quantum-cascade lasers with metal-metal waveguides.” Semiconductor Science and Technology, vol. 20, no. 7,

July 2005, pp. S228-36. http://dx.doi.org/10.1088/0268-1242/20/7/013

46. A. L. Betz, R. T. Boreiko, B. S. Williams, S. Kumar, Q. Hu and J. L. Reno, “Frequency and phase-lock control of

a 3 THz quantum cascade laser.” Optics Letters, vol. 30, no. 14, July 2005, pp. 1837-9.

http://www.opticsinfobase.org/abstract.cfm?URI=ol-30-14-1837

47. J. R. Gao, J. N. Hovenier, Z. Q. Yang, and J. J. A. Baselmans, A. Baryshev, M. Hajenius, T. M. Klapwijk, A. J. L.

Adam, T. O. Klaassen, B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Terahertz heterodyne receiver based on

a quantum cascade laser and a superconducting bolometer.” Applied Physics Letters, vol. 86, 13 June 2005, pp.

244104. http://link.aip.org/link/?APPLAB/86/244104/1

(Reprinted in Virtual Journal of Nanoscale Science and Technology)

48. B. S. Williams, S. Kumar, Q. Hu and J. L. Reno, “Operation of terahertz quantum-cascade lasers at 164 K in pulsed

mode and 117 K in continuous-wave mode.” Optics Express, vol. 13, no. 9, 3 May 2005, pp. 3331.

(Reprinted in Virtual Journal of Nanoscale Science and Technology)

http://dx.doi.org/10.1364/OPEX.13.003331

Benjamin S. Williams, UCLA CV

- 8 -

49. M. S. Vitiello, G. Scamarcio, V. Spagnolo, and B. S. Williams, S. Kumar, Q. Hu and J. L. Reno, “Measurement

of subband electronic temperatures and population inversion in THz quantum-cascade lasers.” Applied Physics

Letters, vol. 86, no. 11, 14 Mar. 2005, pp. 111115.

http://dx.doi.org/10.1063/1.1886266

50. S. Kohen, B. S. Williams, and Q. Hu, “Electromagnetic modeling of terahertz quantum cascade laser waveguides

and resonators.” Journal of Applied Physics, vol. 97, no. 5, 1 Mar. 2005, pp. 053106.

http://dx.doi.org/10.1063/1.1855394

51. B. S. Williams, S. Kumar, Q. Hu and J. L. Reno, “Resonant-phonon terahertz quantum-cascade laser operating at

2.1 THz ( 141 m).” Electronics Letters, vol. 40, no. 7, 1 Apr. 2004, pp. 431-2.

http://dx.doi.org/10.1049/el:20040300

52. S. Kumar, B. S. Williams, S. Kohen, Q. Hu, and J. L. Reno, “Continuous-wave operation of terahertz quantum-

cascade lasers above liquid-nitrogen temperature.” Applied Physics Letters, vol. 84, no. 14, 5 Apr. 2004, pp. 2494-

6. http://dx.doi.org/10.1063/1.1695099

53. Q. Hu, B. S. Williams, S. Kumar, H. Callebaut, and J. L. Reno, “Terahertz quantum-cascade lasers based on

resonant phonon scattering for depopulation.” Philosophical Transactions of the Royal Society of London A, vol.

362, 2004, pp. 233-49. http://www.jstor.org/stable/4142447

54. H. Callebaut, S. Kumar, B. S. Williams, Q. Hu and J. L. Reno, “Importance of electron-impurity scattering for

electron transport in terahertz quantum cascade lasers.” Applied Physics Letters, vol. 84, no. 5, 2 Feb. 2004, pp.

645-7. http://dx.doi.org/10.1063/1.1644337

55. B. S. Williams, S. Kumar, H. Callebaut, Q. Hu and J. L. Reno, “Terahertz quantum-cascade laser operating up to

137 K.” Applied Physics Letters, vol. 83, no. 25, 22 Dec. 2003, pp. 5142-4.

http://dx.doi.org/10.1063/1.1635657

56. B. S. Williams, S. Kumar, H. Callebaut, Q. Hu and J. L. Reno, “Terahertz quantum-cascade laser at 100 m

using metal waveguide for mode confinement.” Applied Physics Letters, vol. 83, no. 11, 15 Sept. 2003, pp. 2124-

6. http://dx.doi.org/10.1063/1.1611642

57. H. Callebaut, S. Kumar, B. S. Williams, Q. Hu and J. L. Reno, “Analysis of transport properties of terahertz

quantum cascade lasers.” Applied Physics Letters, vol. 83, no. 2, 14 Jul. 2003, pp. 207-9.

http://dx.doi.org/10.1063/1.1590749

58. B. S. Williams, S. Kumar, H. Callebaut, Q. Hu and J. L. Reno, “3.4 THz quantum cascade laser operating above

liquid nitrogen temperature.” Electronics Letters, vol. 39, no. 12, 12 Jun. 2003, pp. 915-6.

http://dx.doi.org/10.1049/el:20030587

59. B. S. Williams, H. Callebaut, S. Kumar, Q. Hu and J. L. Reno, “3.4-THz quantum cascade laser based on

longitudinal-optical-phonon scattering for depopulation.” Applied Physics Letters, vol. 82, no. 7, 17 Feb. 2003, pp.

1015-7. http://dx.doi.org/10.1063/1.1554479

60. B. S. Williams, H. Callebaut, Q. Hu, and J. L. Reno, "Magnetotunneling spectroscopy of resonant anticrossing in

terahertz intersubband emitters." Applied Physics Letters, vol.79, no.26, 24 Dec. 2001, pp. 4444-6.

(Reprinted in Virtual Journal of Nanoscale Science and Technology)

http://dx.doi.org/10.1063/1.1426694

61. B. S. Williams, Q. Hu, "Optimized energy separation for phonon scattering in three-level terahertz intersubband

lasers." Journal of Applied Physics, vol.90, no.11, 1 Dec. 2001, pp.5504-11.

http://dx.doi.org/10.1063/1.1413951

62. B. S. Williams, B. Xu, Q. Hu, M. R. Melloch, "Narrow linewidth terahertz intersubband emission from three-level

systems." Applied Physics Letters, vol. 75, no 19, 8 Nov. 1999, pp. 2927-9.

http://dx.doi.org/10.1063/1.125192

63. B. S. Williams, D. Marteau, J. P. Gollub, "Mixing of a passive scalar in magnetically forced two-dimensional

turbulence." Physics of Fluids, vol.9, no.7, July 1997, pp.2061-80.

http://dx.doi.org/10.1063/1.869326

Invited Talks at Conferences and Workshops

Benjamin S. Williams, UCLA CV

- 9 -

1. Christopher A. Curwen, John L. Reno, and Benjamin S Williams, “Frequency-agile metasurface quantum-

cascade VECSELs,” SPIE Photonics West 2020, February 1-7 2020, San Francisco, CA.

2. Benjamin S. Williams, “Widely tunable terahertz metasurface quantum-cascade lasers” IEEE Photonics

Conference (2019), September 29-October 3 2019, San Antonio, CA.

3. Christopher A. Curwen, John L. Reno, and Benjamin S. Williams, “High-power terahertz metasurface external

cavity quantum-cascade lasers,” IEEE Research and Applications of Photonics in Defense (RAPID 2019), May

19-21 2019, Miramar Beach, FL.

4. Benjamin S. Williams, “Terahertz metasurface quantum-cascade lasers: broadband and high-power operation,”

Conference on Lasers and Electro-Optics (CLEO 2019), May 5-10 2019, San Jose, CA.

5. Benjamin S Williams, Christopher A. Curwen, John L. Reno, “High-power terahertz metasurface quantum-

cascade VECSELs,” SPIE Photonics West 2019, February 2-7 2019, San Francisco, CA.

6. Benjamin S. Williams, “High-power and tunable terahertz quantum-cascade VECSELs”, Mid-IR

Optoelectronics: Materials and Devices (MIOMD 2018), Oct 7-10 2018, Flagstaff, AZ.

7. Olivier Spitz, Jiagui Wu, Sudeep Khanal, Mathieu Carras, Chee Wei Wong, Benjamin S. Williams, Frederic

Grillot, “Temperature dependence of a mid-infrared quantum cascade laser with external optical feedback,”

SPIE Photonics West 2018, January 27-February 1 2018, San Francisco, CA.

8. Benjamin S Williams, Luyao Xu, Christopher A. Curwen, Daguan Chen, John L. Reno, Tatsuo Itoh, “Quantum-

cascade lasers based upon metasurfaces,” SPIE Photonics West 2018, January 27-February 1 2018, San

Francisco, CA.

9. Benjamin S. Williams, “Terahertz metasurface QC-lasers,” Intersubband Transitions in Quantum Wells

(ITQW 2017), September 2017, Singapore.

10. Luyao Xu, Christopher A. Curwen, John L. Reno, and Tatsuo Itoh, Benjamin S. Williams , “Terahertz lasers

based upon amplifying reflectarray antennas,” URSI GASS 2017, August 2017, Montreal, CA.

11. Luyao Xu, C. A. Curwen, D. Chen, J. L. Reno, T. Itoh, and B. S. Williams, “Terahertz Metasurface Quantum-

Cascade VECSEL,” SPIE Optics + Photonics, August 6-10 2017, San Diego, CA.

12. Benjamin S. Williams, “Beam engineering in terahertz quantum cascade lasers,” (Invited Tutorial Lecture),

Optical Terahertz Science and Technology (OTST 2017), April 2-6 2017, London, UK.

13. Benjamin S. Williams, Luyao Xu, Christopher A. Curwen, John L. Reno, Tatsuo Itoh “Terahertz quantum-

cascade metasurface VECSELs,” SPIE Photonics West 2017, San Francisco, Feb 1, 2017. Video here:

http://dx.doi.org/10.1117/12.2251447

14. Benjamin S. Williams, “Terahertz Lasers Based Upon Metamaterial Concepts,” CLASTECH Symposium and

Exhibition, Los Angeles, CA, Oct 28, 2016.

15. Luyao Xu, Christopher Curwen, John Reno, Tatsuo Itoh, and Benjamin S. Williams, “Terahertz metasurface

quantum cascade lasers,” 2016 International Conference on Optical MEMS and Nanophotonics (OMN),

Singapore, June 30-Aug 4 2016.

16. Luyao Xu, Philip Hon, Tatsuo Itoh, and Benjamin S. Williams, “Terahertz quantum cascade metasurface

external cavity laser” Intersubband Transitions in Quantum Wells (ITQW) 2015, Vienna Austria, September

6-11 2015.

17. B. S. Williams, A. A. Tavallaee, P. W. C. Hon, T. Itoh, Qisheng Chen, “Terahertz quantum-cascade lasers with

composite right/left handed metamaterial waveguides and antennas,” SPIE Optics+Photonics 2013, August 25-

29 2013, San Diego, CA.

18. B. S. Williams, “Terahertz composite right/left handed metamaterial waveguides,” (Invited Tutorial Lecture),

School of Photonics 2013: Where photonics meets electronics, Cortona, Italy, May 20-23 2013.

19. B. S. Williams, A. A. Tavallaee, P. W. C. Hon, Z. Liu, T. Itoh, “Terahertz quantum-cascade lasers based on

transmission-line metamaterial waveguides,” WOCSEMMAD 2013 (Workshop on Compound Semiconductor

Materials and Devices), February 18-20, New Orleans 2013.

20. B. S. Williams, A. A. Tavallaee, P. W. C. Hon, Z. Liu, T. Itoh, Q. Chen, “Terahertz quantum-cascade lasers

based on transmission-line metamaterial waveguides,” MIOMD-XI (Mid-Infrared Optoelectronics: Materials and

Benjamin S. Williams, UCLA CV

- 10 -

Devices), Sept 4-8 2012, Chicago, IL.

21. B. S. Williams, A. A. Tavallaee, P. W. C. Hon, Z. Liu, Q. Chen, T. Itoh, “Transmission-line metamaterial

antennas for THz quantum-cascade lasers,” International Microwave Symposium (IMS) 2012, WE3A-4,

Montreal Canada, (June 2012). (Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International

http://dx.doi.org/10.1109/MWSYM.2012.6259609)

22. B. S. Williams, A. A. Tavallaee, P. W. C. Hon, Z. Liu, Q. Chen, T. Itoh, “Terahertz quantum cascade lasers and

active metamaterial inspired waveguides,” International Microwave Symposium (IMS) 2012, WME workshop,

Montreal Canada, (June 2012).

23. B. S. Williams, A. A. Tavallaee, P. W. C. Hon, Zhijun Liu, Q. Chen, T. Itoh, “Terahertz active transmission-line

metamaterial antennas,” 3rd International Conference on Metamaterials, Photonic Crystals and Plasmonics

(META 2012), Paris, France, April 2012.

24. B. S. Williams, Zhijun Liu, Philip W. C. Hon, Amir Ali Tavallaee, QiSheng Chen, Tatsuo Itoh “Terahertz

composite right/left handed metamaterials,” Physics of Quantum Electronics 2012, Snowbird, Utah (January

2012).

25. Benjamin S. Williams, Philip Hon, Amir Ali Tavallaee, Tatsuo Itoh, QiSheng Chen, “Terahertz QC-lasers and

active metamaterial antennas,” 2011 SPIE Defense and Security Sensing (DSS), 25-29 April 2011, Orlando,

FL.

26. Benjamin S. Williams, Amir Ali Tavallaee, Karan Mehta, Philip Hon, Tatsuo Itoh, QiSheng Chen “Active

Metamaterial Concepts for Terahertz Quantum-Cascade Lasers,” 2010 Workshop on Innovative Devices and

Systems (WINDS), 5-10 December 2010, Kohala Coast, HI.

27. Benjamin S. Williams, Amir Ali Tavallaee, Karan Mehta, Philip Hon, Tatsuo Itoh, “Terahertz quantum-cascade

lasers and active terahertz metamaterials” Electrochemical Society (ECS) Meeting, October 2010, Las Vegas,

NV.

28. B. S. Williams, Zero-Index Terahertz Quantum-Cascade Metamaterial Lasers, International Quantum Cascade

Lasers School & Workshop August 30-Sept. 3 2010, Florence Italy.

29. B. S. Williams, “Terahertz quantum cascade lasers,” Asia Optical Fiber Communications & Optoelectronic

Exposition & Conference (AOE 2008), Shanghai, China, October 2008.

30. B. S. Williams, invited tutorial presentation on “Terahertz quantum cascade lasers”, GDR-E 2008 Terahertz

Workshop, Paris, France, September 2008.

31. B. S. Williams, “Terahertz quantum cascade lasers for local oscillators”, NASA SOFIA SSSC meeting, NASA

Ames, Mountain View, CA August 28 2008.

32. B. S. Williams, S. Kumar, Qi Qin, A. W. M. Lee, H. Callebaut, S. Kohen, Q. Hu, and J. L. Reno, “Terahertz

quantum cascade lasers,” 2007 Conference on Lasers and Electro-optics (CLEO), Baltimore, MD (May 2007).

33. B. S. Williams, S. Kumar, Qi Qin, A. W. M. Lee, H. Callebaut, S. Kohen, Q. Hu, and J. L. Reno, “High-

temperature and high-power terahertz quantum cascade lasers,” SPIE’s Photonics West, San Jose, CA (January

2007).

34. B. S. Williams, S. Kumar, Qi Qin, A. W. M. Lee, H. Callebaut, S. Kohen, Q. Hu, and J. L. Reno, “Terahertz

quantum cascade lasers,” LEOS Annual Meeting 2006, Montreal, Canada (October 29-Nov 2, 2006).

35. B. S. Williams, S. Kumar, Q. Qin, A. W. M. Lee, Q. Hu, and J. L. Reno, “Terahertz quantum cascade lasers,”

2nd International Workshop on Quantum Cascade Lasers, Maria di Ostuni, Brindisi, Italy (September 6-9,

2006).

36. B. S. Williams, S. Kumar, A. W. M. Lee, H. Callebaut, S. Kohen, Q. Hu, and J. L. Reno, “Terahertz quantum

cascade lasers,” IEEE LEOS 2005 Terahertz Systems Workshop, Lexington, MA (November 9, 2005).

37. B. S. Williams, S. Kumar, H. Callebaut, S. Kohen, Q. Hu, and J. L. Reno, “Terahertz quantum cascade lasers,”

MIT Center for Integrated Photonic Systems (CIPS) Annual Meeting, Cambridge, MA (May 19-20, 2005).

38. B. S. Williams, S. Kumar, H. Callebaut, S. Kohen, Q. Hu, and J. L. Reno, “Terahertz quantum cascade lasers,”

SPIE’s Photonics West, San Jose, CA (January 2005).

Benjamin S. Williams, UCLA CV

- 11 -

39. B. S. Williams, S. Kumar, H. Callebaut, S. Kohen, Q. Hu, and J. L. Reno, “Resonant-phonon terahertz quantum-

cascade lasers using metal-metal waveguides,” 2004 Joint 29th International Conference on Infrared and

Millimeter Waves (IRMMW) and 12th International Conference on Terahertz Electronics (THZ), Karlsruhe,

Germany (September 2004).

40. B. S. Williams, S. Kumar, H. Callebaut, S. Kohen, Q. Hu, and J. L. Reno, “Terahertz quantum cascade lasers

using resonant-phonon depopulation and metal-metal waveguides,” SPIE’s Photonics West, San Jose, CA

(January 2004).

41. B. S. Williams, H. Callebaut, Q. Hu, and J. L. Reno, “Development of THz quantum-cascade lasers,” Physics

of Quantum Electronics 2003, Snowbird, Utah (January 2003).

42. B. S. Williams, "Mixing of a passive scalar in two-dimensional turbulence," 1997 APS/AAPT Joint Meeting,

Washington, D.C. (April 1997).

Conference talks (contributed, speaker underlined)

1. Yue Shen, Christopher Curwen, Luyao Xu, and Benjamin Williams, “THz time-domain characterization of

amplifying quantum cascade metasurface,” Infrared Terahertz Quantum Workshop (ITQW 2019), Ojai, CA

Sept 15-20 2019.

2. Anthony Kim, Christopher Curwen, Luyao Xu, John Reno, and Benjamin Williams, “Terahertz polarization

imaging using quantum cascade laser,” Infrared Terahertz Quantum Workshop (ITQW 2019), Ojai, CA Sept

15-20 2019. (poster presentation)

3. Christopher A. Curwen, Luyao Xu, John L. Reno, and Benjamin S. Williams, “Resonant patch metasurface for

continuous wave operation of terahertz quantum-cascade VECSEL,” Optical Terahertz Science and

Technology (OTST), March 10-15 2019, Santa Fe, NM. (poster presentation)

4. Christopher A. Curwen, John L. Reno, and Benjamin S. Williams, “Short-cavity THz QC-VECSEL with 20%

fractional tuning,” SPIE Photonics West 2019, February 2-7 2019, San Francisco, CA.

5. Christopher A. Curwen, John L. Reno, Benjamin S. Williams, “High power terahertz quantum-cascade

VECSEL,” International Quantum Cascade Laser School and Workshop, Cassis France, September 2-7, 2018.

6. Christopher A. Curwen, John L. Reno, Tatsuo Itoh, Benjamin S. Williams, “Broadband metasurface external-

cavity QC-lasers,” 29th IEEE International Symposium on Space Terahertz Technology (ISSTT 2018),

Pasadena, CA, March 26-28 2018. W3.2

7. Benjamin A. Burnett, Andrew Pan, and Benjamin S. Williams, “Reliable density matrix modeling of THz QCL

active regions from the energy eigenbasis,” Intersubband Transitions in Quantum Wells (ITQW), September

2017, Singapore. (poster presentation)

8. Benjamin A. Burnett, Andrew Pan, Prineha Narang, and Benjamin S. Williams, “Robust density matrix

modeling of quantum cascade laser kinetics,” Conference on Lasers and Electro-Optics (CLEO 2017), San

Jose, CA. JTh2A.15

9. R. Al Hadi, Y. Zhao, Y. Li, Y. Du, C. Curwen, M. K. Lo, B. S. Williams, and M.-C. F. Chang, “Multi-Spectral

Terahertz Interferometric Imaging Based on a Monolithic Retroactive Silicon Chip,” 2017 IEEE International

Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS). 13-15 Nov.

2017. Tel Aviv, Israel. (https://doi.org/10.1109/COMCAS.2017.8244849 )

10. C. A. Curwen, L. Xu, J. L. Reno, T. Itoh, and B. S. Williams, “Broadband continuous tuning of a THz quantum-

cascade VECSEL,” Conference on Lasers and Electro-Optics (CLEO 2017), San Jose, CA. STh4O.2

11. D. Chen, L. Xu, C. A. Curwen, M. Memarian, J. L. Reno, T. Itoh, and B. S. Williams, “Metasurface terahertz

laser with electronically controlled polarization,” Conference on Lasers and Electro-Optics (CLEO 2017), San

Jose, CA. FTu4G.5

12. L. Xu, C. A. Curwen, D. Chen, T. Itoh, J. Reno, and B. S. Williams, “Focusing Metasurface Quantum-Cascade

VECSEL,” Conference on Lasers and Electro-Optics (CLEO 2017), San Jose, CA. SW1C.1

Benjamin S. Williams, UCLA CV

- 12 -

13. Dingkun Ren, Alan C. Farrell, Xiao Meng, Benjamin S. Williams, and Diana L. Huffaker, “Selective-area

InAs-based Nanowires on InP Substrates Towards SWIR/Mid-IR Optical Devices,” Materials Research Society

Fall Meeting (MRS 2016), Nov 27-Dec 2, 2016, Boston, MA.

14. L. Xu, C. Curwen, Q.-S. Chen, J. Reno, T. Itoh, B. S. Williams, “Metasurface quantum-cascade VECSELs

from 2.5-3.5 THz,” International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW/THz

2016), September 25-30 2016, Copenhagen, Denmark.

15. Andrew Pan, Benjamin A. Burnett, and Benjamin S. Williams, “Modeling coherent transport in QCLs without

an artificially localized basis,” International Quantum Cascade Laser School and Workshop (IQCLSW 2016),

September 4-9 2016, Cambridge, UK (poster presentation).

16. R. Al Hadi, Y. Zhao, Y. Li, Y. Du, C. Curwen, B. S. Williams, and M.-C. F. Chang, “A Spectral Profiling

Method of mm-Wave and Terahertz Radiation Sources,” International Microwave Symposium (IMS 2016) San

Francisco, CA, May 22-27 2016.

17. Luyao Xu, Christopher A. Curwen, Philip W. C. Hon, Tatsuo Itoh, and Benjamin S. Williams, “Terahertz

quantum cascade VECSEL” SPIE Photonics West 2016, San Francisco, February 13-18 2016. (Received Best

Student Presentation Award) (Proc SPIE vol. 9734 http://dx.doi.org/10.1117/12.2213230 )

18. Benjamin Burnett and Benjamin Williams, “Polaron effects in terahertz quantum dot cascade lasers”

Intersubband Transitions in Quantum Wells (ITQW) 2015, Vienna Austria, September 6-11 2015.

19. Benjamin Burnett and Benjamin Williams, “Density matrix modeling of terahertz difference frequency

generation in dual active-region quantum cascade lasers,” Intersubband Transitions in Quantum Wells (ITQW)

2015, Vienna Austria, September 6-11 2015 (poster presentation).

20. Benjamin Burnett, Andrew Lin, Diana Huffaker, and Benjamin Williams, “Towards Intersubband nanowire

photonics,” Intersubband Transitions in Quantum Wells (ITQW) 2013, Bolton Landing, NY, September 16-20

2013 (poster presentation).

21. Amir Ali Tavallaee, Philip Hon, Qi-Sheng Chen, Tatsuo Itoh, and Benjamin Williams, “Terahertz Quantum-

Cascade Lasers based on Composite Right/Left-Handed Metamaterials,” 2013 2012 Conference on Lasers and

Electro-optics (CLEO), CTu1J.2, San Jose, CA June 10-14 2013.

22. Philip Hon, Amir Tavallaee, Zhijun Liu, Benjamin Williams, Tatsuo Itoh, “Radiation Modeling of Terahertz

Transmission-Line Metamaterial,” 2012 Conference on Lasers and Electro-optics (CLEO), QTu3F.8, San Jose,

CA (May 6-11 2012).

23. Zhijun Liu, Philip Hon, Amir Tavallaee, Tatsuo Itoh, and Benjamin Williams, “Terahertz composite right/left-

handed transmission-line metamaterial surfaces,” American Physical Society March Meeting, Boston, MA (Feb

27-Mar 2 2012).

24. Amir Tavallaee, Benjamin Williams, Philip Hon, Tatsuo Itoh, Qi-Sheng Chen, “An active terahertz quantum-

cascade metamaterial antenna,” Intersubband Transitions in Quantum Wells (ITQW) 2011, Sardinia, Italy,

September 11-17 2011.

25. Amir Tavallaee, M. Puckett, Benjamin Williams, Philip Hon, Tatsuo Itoh, Qi-Sheng Chen, “A Terahertz Quantum-

Cascade Laser with an Active Leaky-Wave Metamaterial Antenna,” 2011 Conference on Lasers and Electro-optics

(CLEO), CThE1, Baltimore, MD (May 1-6 2011).

26. Amir Ali Tavallaee, Karan Mehta, Benjamin S. Williams, Philip Hon, and Tatsuo Itoh, “Feasibility of a Terahertz

Quantum Cascade Active Metamaterial Based on Composite Right/Left-Handed Transmission-Lines,”

Intersubband Transitions in Quantum Wells (ITQW) 2009, Montreal Canada, September 7-11.

27. Aaron Wade, Georgy Fedorov, Dmitry Smirnov, Benjamin S. Williams, Sushil Kumar, Qing Hu, John L. Reno,

“High Temperature, Magnetic Field Assisted (sub)THz Quantum Cascade Laser,” Thursday, Jun 04, 2009,

CThT6, CLEO 2009

Benjamin S. Williams, UCLA CV

- 13 -

28. Allen L. Hsu, Qing Hu, Benjamin Williams “Four-Well Highly Strained Quantum Cascade Lasers Grown by

Metal-Organic Chemical Vapor Deposition,” Thursday, Jun 04, 2009, CLEO 2009

29. B. S. Williams, S. Kumar, Q. Qin, Q. Hu, and J. L. Reno, “High-power terahertz quantum cascade lasers,” 2006

Conference on Lasers and Electro-optics (CLEO), Long Beach, CA (May 2006).

30. B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “High-temperature performance of terahertz quantum-cascade

lasers,” 8th International Conference on Intersubband Transitions in Quantum Wells (ITQW), Cape Cod, MA

(Sept. 2005).

31. B. S. Williams, S. Kumar, H. Callebaut, S. Kohen, Q. Hu, and J. L. Reno, “Advances in terahertz quantum-

cascade lasers using metal-metal waveguides,” 2005 Optical Terahertz Science and Technology (OTST),

Orlando, FL (March 2005).

32. B. S. Williams, S. Kumar, Q. Hu, and J. L. Reno, “Resonant-phonon terahertz quantum cascade lasers at long

wavelengths,” 2003 Conference on Lasers and Electro-optics (CLEO), Baltimore, MD (June 2003).

33. B. S. Williams, S. Kumar, H. Callebaut, Q. Hu, and J. L. Reno, “Terahertz quantum cascade laser based on

resonant-phonon depopulation and using metal-metal waveguides,” 7th International Conference on

Intersubband Transitions in Quantum Wells (ITQW), Evolène, Switzerland (Sept. 2003).

34. B. S. Williams, H. Callebaut, S. Kumar, Q. Hu, and J. L. Reno, “Terahertz quantum cascade laser based on

LO-phonon-scattering assisted depopulation,” 2003 Conference on Lasers and Electro-optics (CLEO),

Baltimore, MD (June 2003).

35. B. S. Williams, H. Callebaut, S. Kumar, Q. Hu, and J. L. Reno, “Terahertz quantum cascade laser based on

direct LO-phonon-scattering depopulation,” 2003 APS March Meeting, Austin, TX (March 2003).

36. B. S. Williams, Hans Callebaut, Q. Hu, M. R. Melloch, and J. L. Reno, "Terahertz intersubband emission in

structures with and without LO-phonon assisted depopulation," 6th International Conference on Intersubband

Transitions in Quantum Wells (ITQW), Asilomar, California (Sept 2001).

37. B. S. Williams, B. Xu, Q. Hu, and M. R. Melloch, "Narrow-linewidth interwell THz intersubband emission,"

8th International Conference on Terahertz Electronics, Darmstadt, Germany (September 2000).

38. B. S. Williams, B. Xu, Q. Hu, and M. R. Melloch, "Narrow linewidth terahertz intersubband emission from

three-level multiple quantum well structures," 5th International Conference on Intersubband Transitions in

Quantum Wells (ITQW), Bad Ischl, Austria (Sept 1999).

39. B. S. Williams, B. Xu, Q. Hu, and M. R. Melloch, "Terahertz intersubband emission from cascaded multiple

quantum well structures," SPIE's International Symposium on Optical Science, Engineering, and

Instrumentation, Denver, CO (July 1999).

40. B. S. Williams, B. Xu, Q. Hu, and M. R. Melloch, "Narrow linewidth terahertz intersubband emission," 1999

APS March Meeting, Atlanta, GA (March 1999).

41. B. S. Williams, B. Riely, Q. Hu, and M. R. Melloch, "Mid-infrared GaAs/AlGaAs based quantum cascade

emitters," TMS 40th Electronic Materials Conference, Charlottesville, VA (June 1998).

42. B. S. Williams, B. Riely, Q. Hu, and M. R. Melloch, "Mid-infrared quantum cascade lasers," 1998 APS March

Meeting, Los Angeles, CA (March 1998).