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Proceedings Paper

Measuring forces and dynamics for optically levitated 20μm PS particles in air using electrostatic modulation
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Paper Abstract

We demonstrate the simultaneous measurement of optical trap stiffness and quadrant-cell photodetector (QPD) calibration of optically trapped polystyrene particle in air. The analysis is based on the transient response of particles, confined to an optical trap, subject to a pulsed electrostatic field generated by parallel indium tin oxide (ITO) coated substrates. The resonant natural frequency and damping were directly estimated by fitting the analytical solution of the transient response of an underdamped harmonic oscillator to the measured particle displacement from its equilibrium position. Because, the particle size was estimated independently with video microscopy, this approach allowed us to measure the optical force without ignoring the effects of inertia and temperature changes from absorption.

Paper Details

Date Published: 25 August 2015
PDF: 5 pages
Proc. SPIE 9548, Optical Trapping and Optical Micromanipulation XII, 95480E (25 August 2015); doi: 10.1117/12.2191546
Show Author Affiliations
Haesung Park, National Institute of Standards and Technology (United States)
Thomas W. LeBrun, National Institute of Standards and Technology (United States)


Published in SPIE Proceedings Vol. 9548:
Optical Trapping and Optical Micromanipulation XII
Kishan Dholakia; Gabriel C. Spalding, Editor(s)

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