Characterizing conical refraction optical tweezers

McDonald, C., McDougall, C., Rafailov, E. and McGloin, D. (2014). Characterizing conical refraction optical tweezers. Optics Letters, 39 (23), pp. 6691-6694.

Abstract

Conical refraction occurs when a beam of light travels through an appropriately cut biaxial crystal. By focusing the conically refracted beam through a high numerical aperture microscope objective, conical refraction optical tweezers can be created, allowing for particle manipulation in both Raman spots, and in the Lloyd/Poggendorff rings. We present a thorough quantification of the trapping properties of such a beam, focusing on the trap stiffness, and how this varies with trap power and trapped particle location. We show that the lower Raman spot can be thought of as a single-beam optical gradient force trap, while radiation pressure dominates in the upper Raman spot, leading to optical levitation rather than trapping. Particles in the Lloyd/Poggendorff rings experience a lower trap stiffness than particles in the lower Raman spot, but benefit from rotational control.

Publication DOI: https://doi.org/10.1364/OL.39.006691
Divisions: Engineering & Applied Sciences > Aston Institute of Photonics Technology
Additional Information: Funding: EPSRC (EP/H004238/1), and for the award of a studentship
Uncontrolled Keywords: Atomic and Molecular Physics, and Optics
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.osa ... i=ol-39-23-6691 (Publisher URL)
Published Date: 2014-12-01
Authors: McDonald, C.
McDougall, C.
Rafailov, E. ( 0000-0002-4152-0120)
McGloin, D.

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