Surface-plasmon-resonance enhancement: effects on optical trapping and manipulation of nano-objects

Samarendra Mohanty; Kompalli Divakar Rao; Pradeep Kumar Gupta

doi:10.1117/1.2976418

1 August 2008 Surface-plasmon-resonance enhancement: effects on optical trapping and manipulation of nano-objects

Samarendra Mohanty, Kompalli Divakar Rao, Pradeep Kumar Gupta

Author Affiliations +

Journal of Nanophotonics, Vol. 2, Issue 1, 023509 (August 2008). https://doi.org/10.1117/1.2976418

Abstract

The utilization of the enhanced local field near trapped metallic nanoparticles due to surface-plasmon resonance (SPR) for the optical trapping of dielectric fluorescent nano-objects is of considerable interest for single-molecule manipulation. Theoretical calculations as well as experimental measurements show that even with moderate SPR based field enhancement factors, gradient force based trapping of fluorescent molecules would be rather difficult. While trapping of the fluorescent molecule at resonance wavelength showed decreased stiffness, at wavelengths far away from resonance, increase in stiffness was found which was attributed to interplay of SPR-enhanced absorption and gradient forces.

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Samarendra Mohanty, Kompalli Divakar Rao, and Pradeep Kumar Gupta "Surface-plasmon-resonance enhancement: effects on optical trapping and manipulation of nano-objects," Journal of Nanophotonics 2(1), 023509 (1 August 2008). https://doi.org/10.1117/1.2976418

Published: 1 August 2008

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