Plasmon-enhanced optical trapping of metal nanoparticles: force calculations and light-driven rotations of nanoaggregates

O. M. Maragò; R. Saija; F. Borghese; P. Denti; P. H. Jones; E. Messina; G. Compagnini; V. Amendola; M. Meneghetti; M. A. Iatì; P. G. Gucciardi

doi:10.1117/12.863113

27 August 2010 Plasmon-enhanced optical trapping of metal nanoparticles: force calculations and light-driven rotations of nanoaggregates

O. M. Maragò, R. Saija, F. Borghese, P. Denti, P. H. Jones, E. Messina, G. Compagnini, V. Amendola, M. Meneghetti, M. A. Iatì, P. G. Gucciardi

Author Affiliations +

Proceedings Volume 7762, Optical Trapping and Optical Micromanipulation VII; 77622Z (2010) https://doi.org/10.1117/12.863113
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

Abstract

We investigate experimentally and theoretically plasmon-enhanced optical trapping of metal nanoparticles. We calculate the optical forces on gold and silver nanospheres through a procedure based on the Maxwell stress tensor in the transition T-matrix formalism. We compare our calculations with experimental results finding excellent agreement. We also demonstrate how light-driven rotations can be generated and detected in non-symmetric nanorods aggregates. Analyzing the motion correlations of the trapped nanostructures, we measure with high accuracy both the optical trapping parameters, and the rotation frequency induced by the radiation pressure.

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O. M. Maragò, R. Saija, F. Borghese, P. Denti, P. H. Jones, E. Messina, G. Compagnini, V. Amendola, M. Meneghetti, M. A. Iatì, and P. G. Gucciardi "Plasmon-enhanced optical trapping of metal nanoparticles: force calculations and light-driven rotations of nanoaggregates", Proc. SPIE 7762, Optical Trapping and Optical Micromanipulation VII, 77622Z (27 August 2010); https://doi.org/10.1117/12.863113

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