Enhanced nonlinear optical conversion from a periodically nanostructured metal film.
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.
Nahata
Ajay
A
NEC Research Institute, Inc., 4 Independence Way, Princeton, New Jersey 08540, USA. ajay@research.nj.nec.com
Linke
Richard A
RA
Ishi
T
T
Ohashi
K
K