Selective optical trapping based on strong plasmonic coupling between gold nanorods and slab

  • Zheng Y
  • Liu H
  • Wang S
 et al. 
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Abstract

A resonance plasmon mode is formed between a gold nanorod and an infinite
slab in infrared range, with local electric field enhancement factor
over 40. A strong optical attractive force is exerted on the rod
by the slab at resonance frequency. Based on Maxwell stress tensor
method and numerical simulations, the optical force was calculated
to be over 2.0 nN/(mW/mu m(2)). For a fixed incident wavelength,
the enhanced optical force is obtained only for the rods with particular
length when the diameter is fixed. This strong optical force could
be used as a possible selective optical trapping technique in the
future. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3559602]

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Authors

  • Y. J. Zheng

  • H. Liu

  • S. M. Wang

  • T. Li

  • J. X. Cao

  • L. Li

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