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10-fold detection range increase in quadrant-photodiode position sensing for photonic force microscope

Conference paper
Authors Sandro Perrone
Giovanni Volpe
Dmitri Petrov
Published in Review of Scientific Instruments
ISSN 00346748
Publication year 2008
Published at
Language en
Subject categories Physical Sciences

Abstract

We propose a technique that permits one to increase by one order of magnitude the detection range of position sensing for the photonic force microscope with quadrant photodetectors (QPDs). This technique takes advantage of the unavoidable cross-talk between output signals of the QPD and does not assume that the output signals are linear in the probe displacement. We demonstrate the increase in the detection range from 150 to 1400 nm for a trapped polystyrene sphere with radius of 300 nm as probe. © 2008 American Institute of Physics.

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