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Biomed Opt Express. 2011 Aug 1;2(8):2354-63. doi: 10.1364/BOE.2.002354. Epub 2011 Jul 22.

Spin angular momentum transfer from TEM(00) focused Gaussian beams to negative refractive index spherical particles.

Author information

  • 1School of Electrical and Computer Engineering (FEEC), Department of Microwaves and Optics (DMO), University of Campinas (Unicamp), 13083-970 Campinas-SP, Brazil.

Abstract

We investigate optical torques over absorbent negative refractive index spherical scatterers under the influence of linear and circularly polarized TEM(00) focused Gaussian beams, in the framework of the generalized Lorenz-Mie theory with the integral localized approximation. The fundamental differences between optical torques due to spin angular momentum transfer in positive and negative refractive index optical trapping are outlined, revealing the effect of the Mie scattering coefficients in one of the most fundamental properties in optical trapping systems.

KEYWORDS:

(080.0080) Geometric optics; (160.3918) Metamaterials; (290.4020) Mie theory; (350.3618) Left-handed materials; (350.4855) Optical tweezers or optical manipulation

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