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Nano Lett. 2010 Jan;10(1):291-5. doi: 10.1021/nl903563e.

Resonant plasmon nanofocusing by closed tapered gaps.

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  • 1Department of Physics and Nanotechnology, Aalborg University, Skjernvej 4A, Aalborg Øst, Denmark.


We study radiation nanofocusing by closed tapered gaps, i.e. metal V-grooves, under normal illumination, and discover that the local field inside a groove can be resonantly enhanced due to interference of counter-propagating gap plasmons. Considering V-grooves milled in gold, we analyze this phenomenon theoretically, deriving an analytic expression for the resonance condition and predicting more than 550-fold intensity enhancements at resonance, and observe it experimentally with two-photon photoluminescence microscopy, demonstrating more than 100-fold intensity enhancements.

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