Research Papers

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

[+] Author Affiliations
Samarendra K. Mohanty, K. Divakar Rao, Pradeep K. Gupta

Laser Biomedical Applications and Instrumentation Division, Raja Ramanna Center for Advanced Technology, R&D Block D, Indore, Madhya Pradesh 452013 India

J. Nanophoton. 2(1), 023509 (August 7, 2008). doi:10.1117/1.2976418
History: Received January 10, 2008; Revised July 27, 2008; Accepted August 4, 2008; August 7, 2008; Online August 07, 2008
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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.

© 2008 Society of Photo-Optical Instrumentation Engineers

Citation

Samarendra K. Mohanty ; K. Divakar Rao and Pradeep K. Gupta
"Surface-plasmon-resonance enhancement: effects on optical trapping and manipulation of nano-objects", J. Nanophoton. 2(1), 023509 (August 7, 2008). ; http://dx.doi.org/10.1117/1.2976418


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