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Opt Express. 2009 Nov 23;17(24):21918-24. doi: 10.1364/OE.17.021918.

Trapping double negative particles in the ray optics regime using optical tweezers with focused beams.

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  • 1School of Electrical and Computer Engineering (FEEC), University of Campinas (Unicamp), Department of Microwave and Optics (DMO), Campinas/SP, Brazil.


The capabilities of optical tweezers to trap DNG (double negative) spherical particles, with both negative permittivity and permeability, are explored in detail by analyzing some interesting theoretical features not seeing in conventional DPS (double positive) particles possessing positive refractive index. The ray optics regime is adopted and, although this regime is quite simple and limited, its validity is already known and tested for DPS particles such as biological cells and molecules trapped by highly focused beams. Simulation results confirm that even for ray optics, DNG particles present unusual and interesting trapping characteristics.

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