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

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Author(s): Brian G. Burke; David A. LaVan;
Title: Characterization of a High-Speed (10 MHz) Quadrant Avalanche Photodiode for Measuring Cantilever Displacement
Published: September 16, 2012
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
Pages: pp. 127 - 132
Keywords: cantilever, AFM, quadrant, avalanche, photodetector, APD
Research Areas: Microelectromechanical systems (MEMS), Instrumentation, Atomic force microscopy (AFM)
DOI: http://dx.doi.org/10.1007/s00340-012-5162-y  (Note: May link to a non-U.S. Government webpage)