design for afm demonstration kevin d. mccarthy 9/28/05
TRANSCRIPT
![Page 1: Design for AFM demonstration Kevin D. McCarthy 9/28/05](https://reader035.vdocuments.mx/reader035/viewer/2022062511/55148797550346d36e8b4d0c/html5/thumbnails/1.jpg)
Design for AFM demonstration
Kevin D. McCarthy
9/28/05
![Page 2: Design for AFM demonstration Kevin D. McCarthy 9/28/05](https://reader035.vdocuments.mx/reader035/viewer/2022062511/55148797550346d36e8b4d0c/html5/thumbnails/2.jpg)
What is AFM and why is it so clever?
![Page 3: Design for AFM demonstration Kevin D. McCarthy 9/28/05](https://reader035.vdocuments.mx/reader035/viewer/2022062511/55148797550346d36e8b4d0c/html5/thumbnails/3.jpg)
Atomic force microscope
photodetector
laser
k ≈ 0.1 N/m
AFM: Atomic Force Microscope
![Page 4: Design for AFM demonstration Kevin D. McCarthy 9/28/05](https://reader035.vdocuments.mx/reader035/viewer/2022062511/55148797550346d36e8b4d0c/html5/thumbnails/4.jpg)
Atomic force microscope, deflected
photodetector
laser
k ≈ 0.1 N/m
AFM: Atomic Force Microscope
![Page 5: Design for AFM demonstration Kevin D. McCarthy 9/28/05](https://reader035.vdocuments.mx/reader035/viewer/2022062511/55148797550346d36e8b4d0c/html5/thumbnails/5.jpg)
AFM: Atomic Force Microscope
Feedback loop
z
How it traces surface…
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AFM: Atomic Force Microscope
xVpiezo
![Page 7: Design for AFM demonstration Kevin D. McCarthy 9/28/05](https://reader035.vdocuments.mx/reader035/viewer/2022062511/55148797550346d36e8b4d0c/html5/thumbnails/7.jpg)
AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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AFM: Atomic Force Microscope
xVpiezo
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photodetector
laser
k ≈ 0.1 N/m
Optical lever’s sensitivity meansnN forces can be controllably exerted…
![Page 36: Design for AFM demonstration Kevin D. McCarthy 9/28/05](https://reader035.vdocuments.mx/reader035/viewer/2022062511/55148797550346d36e8b4d0c/html5/thumbnails/36.jpg)
Design for class-room scale demo of AFM imaging mechanism…
Z axis motion…
Laser pointer
mirror
“photo-detector” screen
•Wheeled assembly can be rolled over books or other ~1 inch obstacles, while operator tries to maintain dot position on photo-detector screen.
•An assistant can be continuously recording (strip-chart style) the ‘z piezo’ reading vs. x (horizontal position)