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Opt Lett. 2003 Mar 15;28(6):423-5.

Enhanced nonlinear optical conversion from a periodically nanostructured metal film.

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NEC Research Institute, Inc., 4 Independence Way, Princeton, New Jersey 08540, USA.


We demonstrate an approximately10(4) increase in conversion efficiency for optical second-harmonic generation (SHG) from a periodically nanostructured metal structure consisting of a single subwavelength aperture in a thin silver film surrounded by a set of concentric surface grooves. The forward-transmitted second-harmonic radiation from this structure is measured relative to that from an identical aperture with no surrounding surface periodicity. We explain the observed SHG enhancement quantitatively in terms of a measured 120x increase in the strength of the fundamental radiation in the vicinity of the aperture resulting from the periodic nanostructuring.


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