Novel optical trapping - from enhanced forces via vector beams to characterizing optical properties of trapped microparticles

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.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Mechanical Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2011

Author dc:creator

• Roxworthy, Brian J.

Contributors dc:contributor

• Toussaint, Kimani C.

• Optical Forces
• Polarization
• Measuring Optical Properties

Statement dc:rights

• Copyright 2011 Brian J. Roxworthy

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/24357

OAI record oai:identifier

https://www.ideals.illinois.edu/oai-pmh?verb=GetRecord&metadataPrefix=etdms&identifier=oai%3Awww.ideals.illinois.edu%3A2142%2F24357