Discriminatory effects in the optical binding of chiral nanoparticles

Kayn A. Forbes; David S. Bradshaw; David L. Andrews

doi:10.1117/12.2188147

25 August 2015 Discriminatory effects in the optical binding of chiral nanoparticles

Kayn A. Forbes, David S. Bradshaw, David L. Andrews

Proceedings Volume 9548, Optical Trapping and Optical Micromanipulation XII; 95480M (2015) https://doi.org/10.1117/12.2188147
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

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.

Conference Presentation

Citation Download 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 (25 August 2015); https://doi.org/10.1117/12.2188147

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available