Near-field enhanced optical tweezers utilizing femtosecond-laser nanostructured substrates

D. G. Kotsifaki, M. Kandyla, P. G. Lagoudakis

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

We present experimental evidence of plasmonic-enhanced optical tweezers, of polystyrene beads in deionized water in the vicinity of metal-coated nanostructures. The optical tweezers operate with a continuous wave near-infrared laser. We employ a Cu/Au bilayer that significantly improves dissipation of heat generated by the trapping laser beam and avoid de-trapping from heat convection currents. We investigate the improvement of the optical trapping force and the effective trapping quality factor, and observe an exponential distance dependence of the trapping force from the nanostructures, indicative of evanescent plasmonic enhancement.

Original languageEnglish
Article number211111
JournalApplied Physics Letters
Volume107
Issue number21
DOIs
Publication statusPublished - 23 Nov 2015
Externally publishedYes

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