## Analysis of the radiation force and torque exerted on a chiral sphere by a Gaussian beam |

Optics Express, Vol. 21, Issue 7, pp. 8677-8688 (2013)

http://dx.doi.org/10.1364/OE.21.008677

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### Abstract

Under the framework of generalized Lorenz-Mie theory, we calculate the radiation force and torque exerted on a chiral sphere by a Gaussian beam. The theory and codes for axial radiation force are verified when the chiral sphere degenerates into an isotropic sphere. We discuss the influence of a chirality parameter on the radiation force and torque. Linearly and circularly polarized incident Gaussian beams are considered, and the corresponding radiation forces and torques are compared and analyzed. The polarization of the incident beam considerably influences radiation force of a chiral sphere. In trapping a chiral sphere, therefore, the polarization of incident beams should be chosen in accordance with the chirality. Unlike polarization, variation of chirality slightly affects radiation torque, except when the imaginary part of the chirality parameter is considered.

© 2013 OSA

**OCIS Codes**

(140.7010) Lasers and laser optics : Laser trapping

(290.5850) Scattering : Scattering, particles

(160.1585) Materials : Chiral media

**ToC Category:**

Optical Trapping and Manipulation

**History**

Original Manuscript: January 15, 2013

Revised Manuscript: March 10, 2013

Manuscript Accepted: March 15, 2013

Published: April 2, 2013

**Virtual Issues**

Vol. 8, Iss. 5 *Virtual Journal for Biomedical Optics*

**Citation**

Qing-Chao Shang, Zhen-Sen Wu, Tan Qu, Zheng-Jun Li, Lu Bai, and Lei Gong, "Analysis of the radiation force and torque exerted on a chiral sphere by a Gaussian beam," Opt. Express **21**, 8677-8688 (2013)

http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-21-7-8677

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