Discriminatory effects in the optical binding of chiral nanoparticles

Forbes, Kayn, Bradshaw, David and Andrews, David (2015) Discriminatory effects in the optical binding of chiral nanoparticles. Proceedings of SPIE, 9548. ISSN 0277-786X

[img]
Preview
PDF (Discriminatory effects in the optical binding of chiral nanoparticles) - Published Version
Download (283kB) | Preview

Abstract

The laser-induced intermolecular force that exists between two or more particles subjected to a moderately intense laser beam is termed ‘optical binding’. Completely distinct from the single-particle forces that give rise to optical trapping, the phenomenon of optical binding is a manifestation of the coupling between optically induced dipole moments in neutral particles. In conjunction with optical trapping, the optomechanical forces in optical binding afford means for the manipulation and fabrication of optically bound matter. The Casimir-Polder potential that is intrinsic to all matter can be overridden by the optical binding force in cases where the laser beam is of sufficient intensity. Chiral discrimination can arise when the laser input has a circular polarization, if the particles are themselves chiral. Then, it emerges that the interaction between particles with a particular handedness is responsive to the left- or right handedness of the light. The present analysis, which expands upon previous studies of chiral discrimination in optical binding, identifies a novel mechanism that others have previously overlooked, signifying that the discriminatory effect is much more prominent than originally thought. The new theory leads to results for freely-tumbling chiral particles subjected to circularly polarized light. Rigorous conditions are established for the energy shifts to be non-zero and display discriminatory effects with respect to the handedness of the incident beam. Detailed calculations indicate that the energy shift is larger than those previously reported by three orders of magnitude.

Item Type: Article
Additional Information: Citation: Kayn A. Forbes ; David S. Bradshaw and David L. Andrews "Discriminatory effects in the optical binding of chiral nanoparticles", Proc. SPIE 9548, Optical Trapping and Optical Micromanipulation XII, 95480M (August 25, 2015); doi:10.1117/12.2188147; http://dx.doi.org/10.1117/12.2188147 Copyright 2015 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. DOI link to abstract: 10.1117/12.2188147
Uncontrolled Keywords: nanoparticles,optical binding,particles,lasers,optical trapping,optomechanical design,fabrication,polarization
Faculty \ School: Faculty of Science > School of Chemistry
Faculty of Science
Related URLs:
Depositing User: Pure Connector
Date Deposited: 13 Oct 2015 16:00
Last Modified: 18 Sep 2020 00:01
URI: https://ueaeprints.uea.ac.uk/id/eprint/54689
DOI: 10.1117/12.2188147

Actions (login required)

View Item View Item