The Transmission Characteristics of Asymmetrical Multi-Teeth-Shaped Plasmonic Waveguide Structure

• Published in: IEEE photonics technology letters Vol. 28; no. 21; pp. 2467 - 2470
• Main Authors: Wang, Hongqing, Yang, Junbo, Wu, Wenjun, Huang, Jie, Zhang, Jingjing, Yan, Peng, Chen, Dingbo, Xiao, Gongli
• Format: Journal Article
• Language: English
• Published: IEEE 01.11.2016
• Subjects: filter; metal–insulator–metal structure; Optical filters; Optical waveguides; Photonic band gap; Plasmons; Refractive index; Surface plasmon polaritons; teeth-shaped waveguide
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2016.2601111

The transmission characteristics of asymmetrical multi-teeth-shaped plasmonic waveguide structure are investigated theoretically and numerically. The tunable dual flat bandgaps are achieved in our proposed structure. This feature can provide a promising application for plasmonic bandstop filter. In addition, according to the hybrid effects of the first order resonance and high order resonance of N identical asymmetrical teeth, a sharp transmission peak can be obtained. This peak, which is within two bandgaps, possesses a relative small full-width at half-maximum, about 11.5 nm. Moreover, the resonant wavelength of this sharp peak can be regulated by adjusting the relative depths of N asymmetrical teeth. These results that we acquire may have important application potential on high-density nanoplasmonic integration circuits.