Novel optical trapping - from enhanced forces via vector beams to characterizing optical properties of trapped microparticles
Roxworthy, Brian J.
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https://hdl.handle.net/2142/24357
Description
Title
Novel optical trapping - from enhanced forces via vector beams to characterizing optical properties of trapped microparticles
Author(s)
Roxworthy, Brian J.
Issue Date
2011-05-25T14:35:57Z
Director of Research (if dissertation) or Advisor (if thesis)
Toussaint, Kimani C.
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Optical Forces
Polarization
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.
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