18 October 2004 Generation of sub-wavelength traps in the optical near field
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Abstract
We report the sub-wavelength patterning of the optical near-field by total internal reflection illumination of a regular array of resonant gold nano-particles. Under appropriate conditions, the in-plane coupling between localized surface plasmon fields gives rise to sub-wavelength light spots between the structures. Measurements performed with an Apertureless Scanning Near-Field Optical Microscope (ASNOM) show good agreement with theoretical predictions based on the Green dyadic method. This concept might offer a convenient way to elaborate extended optical trap landscapes for manipulation of sub-micrometer systems.
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Romain Quidant, Romain Quidant, P. Ghenuche, P. Ghenuche, Goncal Badenes, Goncal Badenes, } "Generation of sub-wavelength traps in the optical near field", Proc. SPIE 5514, Optical Trapping and Optical Micromanipulation, (18 October 2004); doi: 10.1117/12.555818; https://doi.org/10.1117/12.555818
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