Bidirectional optical sorting of gold nanoparticles

M. Ploschner, T. Čižmár, M. Mazilu, A. Di Falco, K. Dholakia

Research output: Contribution to journalArticlepeer-review

87 Citations (Scopus)

Abstract

We present a generic technique allowing size-based all-optical sorting of gold nanoparticles. Optical forces acting on metallic nanoparticles are substantially enhanced when they are illuminated at a wavelength near the plasmon resonance, as determined by the particle's geometry. Exploiting these resonances, we realize sorting in a system of two counter-propagating evanescent waves, each at different wavelengths that selectively guide nanoparticles of different sizes in opposite directions. We validate this concept by demonstrating bidirectional sorting of gold nanoparticles of either 150 or 130 nm in diameter from those of 100 nm in diameter within a mixture.

Original languageEnglish
Pages (from-to)1923-1927
Number of pages5
JournalNano letters
Volume12
Issue number4
DOIs
Publication statusPublished - 2012 Apr 11

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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