27 August 2010 Controlled formation of optically bound matter in evanescent fields
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Abstract
In this paper, we detail two techniques for standing wave evanescent field optical trapping utilizing total internal reflection at a prism-water interface. Firstly, we describe an actively-locked cavity enhancement technique that generates circulating powers in excess of 10 W over an area of 150 μm x 75 μm on the prism surface using a 400 mW source, as well as providing control over the shape of the underlying transverse cavity mode. Secondly, we have combined an inverted optical tweezers with a counter-propagating evanescent wave trapping experiment, providing a useful platform for exploring light scattering interactions between small ensembles of particles. The resulting structures are compared to our theoretical model based upon Generalised Lorentz-Mie Theory.
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Michael D. Summers, Richard D. Dear, Jonathan M. Taylor, Grant A. D. Ritchie, "Controlled formation of optically bound matter in evanescent fields", Proc. SPIE 7762, Optical Trapping and Optical Micromanipulation VII, 776213 (27 August 2010); doi: 10.1117/12.860685; https://doi.org/10.1117/12.860685
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