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Journal of Nanomaterials
Volume 2013, Article ID 484207, 6 pages
Research Article

A Subwavelength Plasmonic Waveguide Filter with a Ring Resonator

1Key Laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education, School of Information Science and Engineering, Hunan University, Changsha 410082, China
2School of Physics and Microelectronics, Hunan University, Changsha 410082, China
3School of Nuclear Science and Technology, University of South China, Hengyang 421001, China

Received 29 January 2013; Accepted 20 February 2013

Academic Editor: Bo Yu

Copyright © 2013 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.


The transmission characteristics of the electromagnetic wave are numerically investigated in two-dimensional compound plasmonic structures composed of two straight subwavelength metal-insulator-metal (MIM) waveguides and a ring resonator. The two straight MIM waveguides situate on both sides of the ring resonator, and the MIM waveguide of the outgoing side has a positional angular deviation relative to the MIM waveguide of the incoming side. The results show that the filtering performances of the asymmetric structures are greatly improved in comparison with the symmetric structure . For most of the asymmetric structures, there is a transmission minimum at the slightly bigger wavelength than one at which the transmission peak appears for the symmetric structures, and there is still a transmission peak at the wavelength of the transmission peak of the symmetric structures. Moreover, the difference between the transmission peak and valley is increased, and the breadth of the transmission peak becomes narrow.