Open AccessAnalysis of the radiation force and torque exerted on a chiral sphere by a Gaussian beam
Author(s) -
Qingchao Shang,
Zhensen Wu,
Tan Qu,
Zhengjun Li,
Lu Bai,
Lei Gong
Publication year - 2013
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.21.008677
Subject(s) - physics , optics , radiation pressure , torque , chirality (physics) , polarization (electrochemistry) , isotropy , optical force , gaussian beam , circular polarization , beam (structure) , classical mechanics , optical tweezers , quantum mechanics , chemistry , chiral symmetry breaking , nambu–jona lasinio model , quark , microstrip
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.