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Title:Novel optical trapping - from enhanced forces via vector beams to characterizing optical properties of trapped microparticles
Author(s):Roxworthy, Brian J.
Advisor(s):Toussaint, Kimani C.
Department / Program:Mechanical Sci & Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Optical Forces
Measuring Optical Properties
Abstract:The main purpose of this thesis is to investigate the eff ects of polarization on optical forces as well as to utilize such forces in the measurement of optical properties of micro-scale particles. Theoretical aspects of optical trapping are presented and the focusing action of high numerical aperture lenses is studied in detail. Simulations are performed that quantify the x, y and z focal polarization components of conventional Gaussian beams as well as 4 cylindrical vector beams, and the simulation results are used to explain experimental optical trapping behavior of the 5 beams. In addition, the custom built optical trapping microscope is used for quantitative phase imaging of 1 um microspheres, and the results are presented as a first step toward the measurement of the optical properties of optically trapped particles.
Issue Date:2011-05-25
Rights Information:Copyright 2011 Brian J. Roxworthy
Date Available in IDEALS:2011-05-25
Date Deposited:2011-05

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