Three-dimensional potential analysis of radiation pressure exerted on a single microparticle
- 7 July 1997
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 71 (1), 37-39
- https://doi.org/10.1063/1.119461
Abstract
A system that makes it possible to precisely and instantaneously observe a potential energy of laser trapping as a function of three-dimensional position was developed for analyzing radiation pressure acting on a single microparticle in solution. Position sensing with a quadrant photodiode and total internal reflection microscopy are applied for measuring thermal Brownian motion of the trapped particle with ∼10 nm resolution, and a trapping potential profile is estimated by a thermodynamical analysis based on the Boltzmann distribution. Characteristic features of the present system are discussed.Keywords
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