10-fold detection range increase in quadrant-photodiode position sensing for photonic force microscope.
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.
Perrone
Sandro
S
ICFO-Institut de Ciencies Fotoniques, Mediterranean Technology Park, Castelldefels (Barcelona) 08860, Spain.
Volpe
Giovanni
G
Petrov
Dmitri
D
D002138:Calibration; D004560:Electricity; D016013:Likelihood Functions; D008846:Micromanipulation / Q000379:methods; D008853:Microscopy / Q000295:instrumentation / Q000379:methods*; D008863:Microspheres; D052898:Optical Tweezers; D055095:Optics and Photonics; D011137:Polystyrenes / Q000737:chemistry
D011137:Polystyrenes