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Journal of Nanomaterials
Volume 2014, Article ID 341050, 7 pages
Research Article

Fano Resonance of the Symmetry-Reduced Metal Bar Grating Structure

School of Physics and Electronic Science, Hunan University of Science and Technology, Xiangtan 411201, China

Received 4 March 2014; Accepted 9 August 2014; Published 16 October 2014

Academic Editor: Christian Brosseau

Copyright © 2014 Suxia Xie 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.


We demonstrate that Fano resonance and even multipole Fano resonance can be obtained in a symmetry-reduced structure composed of gold bars with different bar sizes or bar shapes on a layer of dielectric. There is a transparency window opened within the frequency region of the absorptive dipole resonance by metallic bars, as long as the narrow grating waveguide mode induced by reducing symmetry is coincided in spectrum with the dipole resonance such that a destructive interference happens between these two resonant modes. Line shape of the transmission spectra of the nanostructure can be modulated effectively by changing the size or shape of the series of metal bars. The results found can be useful in the design of novel optical device.