Abstract

We design a metal-dielectric structure to realize directional beaming of dual-wavelength light based on the guided-mode resonance theory. A single nanoslit preformatted in an optically thick metal film flanked by a dielectric grating on the exit surface of the slit can realize directional beaming of two wavelength lights (442 and 633nm), simultaneously. Numerical simulations by using the finite-difference time-domain method demonstrate the theoretical prediction. Further investigations reveal that the structures can achieve dual-wavelength light beaming in a wide frequency window, implying the potential of the structures in near-field optics and spectroscopy, data storage, biosensors, and nanoscale directional light sources and emitters.

© 2008 Optical Society of America

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