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Characterization of a High-Speed (10 MHz) Quadrant Avalanche Photodiode for Measuring Cantilever Displacement

Published

Author(s)

Brian G. Burke, David A. LaVan

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

Keywords

cantilever, AFM, quadrant, avalanche, photodetector, APD

Citation

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 April 15, 2024)
Created September 15, 2012, Updated October 12, 2021