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Surface-enhanced resonance Raman scattering in optical tweezers using co-axial second harmonic generation

Jordan, P. and Cooper, J. and McNay, G. and Docherty, F.T. and Graham, D. and Smith, W.E. and Sinclair, G. and Padgett, M.J. (2005) Surface-enhanced resonance Raman scattering in optical tweezers using co-axial second harmonic generation. Optics Express, 13 (11). pp. 4148-4153. ISSN 1094-4087

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Abstract

Silica particles were partially coated with silver, and a suitable chromophore, such that they could be trapped within an optical tweezers system and simultaneously be excited to emit a surface-enhanced resonance Raman scattering (SERRS) spectrum. A standard 1064 nm TEM00 mode laser was used to trap the bead whilst a frequency doubling crystal inserted into the beam gave several microwatts of 532 nm co-linear light to excite the SERRS emission. The configuration has clear applications in providing apparatus that can manipulate a particle whilst simultaneously obtaining surface sensitive sensory information.