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Journal of Nanomaterials
Volume 2015 (2015), Article ID 179621, 7 pages
http://dx.doi.org/10.1155/2015/179621
Research Article

Effects of Dielectric Environment on Phase Resonance in Compound Grating

1College of Sciences, East China Jiaotong University, Nanchang 330013, China
2College of Physics Science and Technology, Central South University, Changsha 410083, China

Received 24 March 2015; Revised 6 July 2015; Accepted 12 July 2015

Academic Editor: Mihai V. Putz

Copyright © 2015 Y. Xiao 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

Effects of dielectric environment on phase resonance in compound grating are investigated theoretically and numerically. Transmission characteristics can be effectively tailored by changing the dielectric environment. When the dielectric constants between the two slits are slightly different, the transmission spectra show obvious dips for all modes, and values of the dips are near to zero, and photon forbidden band gaps emerge with larger difference of dielectric environment. The corresponding physical mechanisms are discussed by means of effective refractive index and effective length based on F-P-like and phase resonant mechanisms. In addition, the electric field for the peak at the shorter wavelength of the dip is mainly concentrated on the slit filled with smaller dielectric constant, while the electric field located on the slit filled with larger dielectric constant for the peak at the longer wavelength of the dip. By selecting a proper dielectric environment, the channel selecting device can be constructed by using the dielectric compound grating.