Computational inverse design of non-intuitive illumination patterns to maximize optical force or torque
Author(s)
Lee, Yoonkyung E.; Miller, Owen D.; Reid, McMahon Thomas Homer; Johnson, Steven G; Fang, Xuanlai![Thumbnail](/bitstream/handle/1721.1/108082/Manuscript_v35_Arxiv.pdf.jpg?sequence=4&isAllowed=y)
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This paper aims to maximize optical force or torque on arbitrary micro- and nanoscale objects using numerically optimized structured illumination. By developing a numerical framework for computer-automated design of 3d vector-field illumination, we demonstrate a 20-fold enhancement in optical torque per intensity over circularly polarized plane wave on a model plasmonic particle. The nonconvex optimization is efficiently performed by combining a compact cylindrical Bessel basis representation with a fast boundary element method and a standard derivative-free, local optimization algorithm. We analyze the optimization results for 2000 random initial configurations, discuss the tradeoff between robustness and enhancement, and compare the different effects of multipolar plasmon resonances on enhancing force or torque. All results are obtained using open-source computational software available online.
Date issued
2017-03Department
Massachusetts Institute of Technology. Department of Mathematics; Massachusetts Institute of Technology. Department of Mechanical EngineeringJournal
Optics Express
Publisher
Optical Society of America
Citation
Lee, Yoonkyung E. et al. “Computational Inverse Design of Non-Intuitive Illumination Patterns to Maximize Optical Force or Torque.” Optics Express 25.6 (2017): 6757.
Version: Author's final manuscript
ISSN
1094-4087