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

Journal Article · Mon Nov 23 00:00:00 EST 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4936600· OSTI ID:22486116

Kandyla, M. ^[1]; Lagoudakis, P. G. ^[2]

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1. Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vasileos Constantinou Avenue, 11635 Athens (Greece)
2. Department of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ (United Kingdom)

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.

• OSTI ID: 22486116
• Journal Information: Applied Physics Letters, Vol. 107, Issue 21; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONVECTION
HEAT
LASERS
LAYERS
METALS
NANOSTRUCTURES
POLYSTYRENE
QUALITY FACTOR
SUBSTRATES
TRAPPING
WATER