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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 17 — Aug. 15, 2011
  • pp: 16044–16057

Calculation of radiation forces exerted on a uniaxial anisotropic sphere by an off-axis incident Gaussian beam

Zheng-Jun Li, Zhen-Sen Wu, and Qing-Chao Shang  »View Author Affiliations

Optics Express, Vol. 19, Issue 17, pp. 16044-16057 (2011)

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Using the theory of electromagnetic scattering of a uniaxial anisotropic sphere, we derive the analytical expressions of the radiation forces exerted on a uniaxial anisotropic sphere by an off-axis incident Gaussian beam. The beam’s propagation direction is parallel to the primary optical axis of the anisotropic sphere. The effects of the permittivity tensor elements ε t and ε z on the axial radiation forces are numerically analyzed in detail. The two transverse components of radiation forces exerted on a uniaxial anisotropic sphere, which is distinct from that exerted on an isotropic sphere due to the two eigen waves in the uniaxial anisotropic sphere, are numerically studied as well. The characteristics of the axial and transverse radiation forces are discussed for different radii of the sphere, beam waist width, and distances from the sphere center to the beam center of an off-axis Gaussian beam. The theoretical predictions of radiation forces exerted on a uniaxial anisotropic sphere are hoped to provide effective ways to achieve the improvement of optical tweezers as well as the capture, suspension, and high-precision delivery of anisotropic particles.

© 2011 OSA

OCIS Codes
(140.0140) Lasers and laser optics : Lasers and laser optics
(160.1190) Materials : Anisotropic optical materials
(290.5850) Scattering : Scattering, particles

ToC Category:
Optical Trapping and Manipulation

Original Manuscript: June 21, 2011
Revised Manuscript: July 20, 2011
Manuscript Accepted: July 20, 2011
Published: August 8, 2011

Virtual Issues
Vol. 6, Iss. 9 Virtual Journal for Biomedical Optics

Zheng-Jun Li, Zhen-Sen Wu, and Qing-Chao Shang, "Calculation of radiation forces exerted on a uniaxial anisotropic sphere by an off-axis incident Gaussian beam," Opt. Express 19, 16044-16057 (2011)

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