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Active and Passive Electronic Components
Volume 2007 (2007), Article ID 24084, 8 pages
http://dx.doi.org/10.1155/2007/24084
Research Article

Extraordinary Transmission and Enhanced Emission with Metallic Gratings Having Converging-Diverging Channels

1Department of Mechanical Engineering, Center for Nano and Molecular Science and Technology, University of Texas, Austin, TX 78712, USA
2Physics Department, Laser Optics Research Center, USAF Academy, CO 80840, USA
3Air Force Research Laboratory, AFOSR/NE, 875 North Randolph Street, Suite 326, Arlington, VA 22203, USA

Received 22 October 2007; Accepted 26 November 2007

Academic Editor: Weili Zhang

Copyright © 2007 Arvind Battula et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Transmission metallic gratings having the shape of converging-diverging channel (CDC) give an extra degree of freedom to exhibit enhanced transmission resonances. By varying the gap size at the throat of CDC, the spectral locations of the transmission resonance bands can be shifted close to each other and have high transmittance in a very narrow energy band. Hence, the CDC shape metallic gratings can lead to almost perfect transmittance for any desired wavelength by carefully optimizing the metallic material, gap at the throat of CDC, and grating parameters. In addition, a cavity surrounded by the CDC shaped metallic grating and a one-dimensional (1D) photonic crystal (PhC) can lead to an enhanced emission with properties similar to a laser. The large coherence length of the emission is achieved by exploiting the coherence properties of the surface waves on the gratings and PhC. The new multilayer structure can attain the spectral and directional control of emission with only p-polarization. The resonance condition inside the cavity is extremely sensitive to the wavelength, which would then lead to high emission in a very narrow wavelength band. Such simple 1D multilayer structure should be easy to fabricate and have applications in photonic circuits, thermophotovoltaics, and potentially in energy efficient incandescent sources.