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Journal of Nanomaterials
Volume 2015, Article ID 541409, 7 pages
http://dx.doi.org/10.1155/2015/541409
Research Article

Analysis of Filter and Waveguide Effect Based on the MIM Nanodisk with a Metallic Block

Key Lab for Micro-Nano Physics and Technology, School of Physics and Electronics, Hunan University, Changsha 410082, China

Received 3 November 2014; Revised 12 January 2015; Accepted 12 January 2015

Academic Editor: Christian Brosseau

Copyright © 2015 Xiang Zhai 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

A novel and meaningful plasmonic filter based on the metal-insulator-metal (MIM) waveguides directly connected to a nanocavity with a metallic block is proposed and demonstrated numerically. By the effective index method and the resonant theory of disk-shaped nanocavity, we reveal that the resonant wavelengths can be simply tuned by adjusting the height of the block, which is in accordance with the results calculated by finite-difference time-domain (FDTD) simulations. We also rotate the metallic block to achieve two resonant modes. One mode shows a blue shift, and the other mode shows a red shift. It is shown that the proposed structure performs as a bend waveguide not a filter when the width of the block increases to hundreds of nanometers. The proposed structure will have significant potential applications in nanointegrated circuits for optical filtering and processing.