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Journal of Nanomaterials
Volume 2015, Article ID 178583, 8 pages
http://dx.doi.org/10.1155/2015/178583
Research Article

Investigating the Fabrication Imperfections of Plasmonic Nanohole Arrays and Its Effect on the Optical Transmission Spectra

1Department of Physics, King Abdulaziz University, Jeddah 21432, Saudi Arabia
2Department of Engineering Mathematics and Physics, Alexandria University, Alexandria 21544, Egypt
3Department of Electrical Engineering, King Abdulaziz University, Jeddah 21432, Saudi Arabia

Received 24 November 2014; Revised 26 February 2015; Accepted 27 February 2015

Academic Editor: Meng Lu

Copyright © 2015 Amr M. Mahros and Marwa M. Tharwat. 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

We investigate the extraordinary optical transmission spectra of thin gold films perforated with imperfect nanohole arrays using the finite difference time domain (FDTD) method. Exponential shapes for the nanohole sidewalls are used. To the best of our knowledge, such investigation of transmission spectra of imperfect nanohole arrays has not previously been demonstrated. It was found that the asymmetry between the two openings of the circular nanoholes or bending to their sidewalls strongly modifies both the intensity and resonance positions of the transmission spectra. Furthermore, the results of this study assist in explaining the technicality of extraordinary optical transmission phenomenon and why some experimental results on transmission differ from those expected.