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

Near-field enhanced optical tweezers utilizing femtosecond-laser nanostructured substrates
Near-field enhanced optical tweezers utilizing femtosecond-laser nanostructured substrates
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.
0003-6951
Kotsifaki, D. G.
4d507b4b-ff9d-4f85-b354-5f8280b74b06
Kandyla, M.
2e387d7b-d085-40c9-af28-0cd33a8556ee
Lagoudakis, P. G.
ea50c228-f006-4edf-8459-60015d961bbf
Kotsifaki, D. G.
4d507b4b-ff9d-4f85-b354-5f8280b74b06
Kandyla, M.
2e387d7b-d085-40c9-af28-0cd33a8556ee
Lagoudakis, P. G.
ea50c228-f006-4edf-8459-60015d961bbf

Kotsifaki, D. G., Kandyla, M. and Lagoudakis, P. G. (2015) Near-field enhanced optical tweezers utilizing femtosecond-laser nanostructured substrates. Applied Physics Letters, 107 (21), [211111]. (doi:10.1063/1.4936600).

Record type: Article

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.

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More information

Accepted/In Press date: 14 November 2015
Published date: 23 November 2015

Identifiers

Local EPrints ID: 430564
URI: http://eprints.soton.ac.uk/id/eprint/430564
ISSN: 0003-6951
PURE UUID: 103b27c3-7303-467b-95b8-5d1a7671cdc4

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Date deposited: 03 May 2019 16:30
Last modified: 03 May 2019 16:30

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