1 矽核光纖的製備與光學特性量測 silicon cored optical fibers – fabrication and...
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矽核光纖的製備與光學特性量測
Silicon cored optical fibers – fabrication and optical characterization
報告人:王倫 教授lon@ntu.edu.tw
2013-07-12
Acknowledgement• Coworkers:
Yi-Chuan Tseng, Yan-Bo Huang
Prof. Hsuen-Li Chen (Department of Material
Science and Engineering)• Monthly discussion with the joint team members
from Dr. Ching-Fuh Lin, Dr. Wing-Kit Choi and
Dr. Chao-Hsin Wu. • This work is supported by International Collaboration
Project with Peking University (Grant No. NTU-ICRP-102R7558)
• .
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Outline
Motivation and Prior Arts Design and Fabrication Experiment Results Discussion Summary
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• Optical fibers are silica based for communication/sensing• Pros and Cons
• Semiconductor devices -- Si based for electronics, III-V for light sources• Pros and Cons
• Semiconductor fibers ??• Many unknowns with expected pros and cons
• Potential Applications• mid-Infrared• Nonlinear• Silicon photonics• Sensing
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Motivation
Sand – abundant supply for making glass fibers and Si chips, a blessing from Heaven to whom we should be grateful.
Research Groups Worldwide
• Southampton University• Clemson University• Pen. State University
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Properties of Semiconductor Fibers• Optics
Size: a few microns depending on transmission or sensingLow transmission loss
Crystalline, smooth interface or surface
• Doping for light sources• Rare earth elements
• Electronics Size: microwire to nanowireGood conductivity
Crystalline better than poly and amorphous Doping for n- and p-type
• E-O integration: 22nm node and below, placement, etc.
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Prior Arts
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Pier J. A. Sazio et al, Southampton University, Science Vol. 311 No. 1583 (2006)
fabricated by using HPCVD
carrier mobility 1.05 cm2/Vsvs.
typical Si FET 10^4-10^5 cm2/Vs
11mm long, dia. 100um, core 5um relatively easy in control on crystalline direction, roughness and diffusion. loss 3dB/cm
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P. J. A. Sazio et al,Southampton university, OE Vol. 20 No.4 (2012)
John Ballato et al, Clemson university, OE Vol. 16 No.23 (2008)
fabricated by using CVDfabricated by using molten core method
Prior Arts
a few meter long, loss 5~7dB/cm
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P. J. A. Sazio et al, Southampton university, Nature photonics, Vol. 6 No.174 (2012)
Prior Arts
amorphous p-n junction
Toward useful junction based devices
OE conversion with a pulsed laser
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JLT Vol. 27 No.15 (2009)
pure SiO2 micro fiber
Well, Our Prior Arts
Uniqueness: several meters long with below nm surface roughness
Using conventional SMF as preform
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Micro Coil Rings
1548.1 1548.2 1548.3 1548.4 1548.5 1548.6 1548.7 1548.8 1548.9 1549-3
-2.5
-2
-1.5
-1
-0.5
0
Wavelength (nm)
Tra
nsm
issi
on(d
B)
FSR = 270pm
Resolution: 5pm
Spectrum of 2-ring Coil
A typical photograph of an MCR whose gaps between adjacent rings are controlled within 1.5 μm.
Experiment Resultsoptical microscope images
c
a. Cross section of Si cored fiber
b. Lateral view of Si cored fiber
c. Lateral view of silicon core
Visual inspection
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Results and Discussion crystalline characterization
Chil-Chyuan Kuo, J. Russ. Laser Res., vol. 32, pp. 12 (2011)
B.L. Boyce et al., Acta Materialia, vol. 58, pp. 439 (2010)
Boundaries can be observed for -a and poly-Si when FE-SEM is used.
P. Hashemi et al, University of Tehran, Conference of Microelectronics, pp. 326 (2005)
Results and Discussion Raman characterization –
to know possible causes for crystalline
Summary• Long Si-cored silica-clad fibers were made.• Their propagation losses were measured, and
crystalline properties characterized.
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Thanks for your attention!
• Questions?• Dreams?
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