Burke, B.
and LaVan, D.
(2012),
Characterization of a High-Speed (10 MHz) Quadrant Avalanche Photodiode for Measuring Cantilever Displacement, Applied Physics Letters, [online], https://doi.org/10.1007/s00340-012-5162-y
(Accessed October 28, 2025)
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Characterization of a High-Speed (10 MHz) Quadrant Avalanche Photodiode for Measuring Cantilever Displacement
Published
Author(s)
,
Abstract
We have measured the characteristics of a high-speed (10 MHz) quadrant avalanche photodiode (APD) in order to detect high frequency resonant oscillations and tip displacements of a cantilever. Currently, no high-speed quadrant detectors with a response bandwidth in the megahertz range are available, and experiments on the order of a few microseconds cannot be studied. A maximum gain of 1500 and sensitivity of 4.6 mV/μm were achieved at an optical power of 50 nW, using an optical spot diameter of 1.0 mm. We investigated the performance of the quadrant APD and measured the frequency response.Citation
Applied Physics Letters
Volume
109
Issue
1
Pub Type
Journals
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Keywords
cantilever, AFM, quadrant, avalanche, photodetector, APD
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Created September 15, 2012, Updated October 12, 2021