Tunable band-pass plasmonic waveguide filters with nanodisk resonators.
A novel and simple plasmonic filter based on metal-insulator-metal plasmonic waveguides with a nanodisk resonator is proposed and investigated numerically. By the resonant theory of disk-shaped nanocavity, we find that the resonance wavelengths can be easily manipulated by adjusting the radius and refractive index of the nanocavity, which is in good agreement with the results obtained by finite-difference time-domain (FDTD) simulations. In addition, the bandwidths of resonance spectra are tunable by changing the coupling distance between the nanocavity and waveguides. This result achieved by FDTD simulations can be accurately analyzed by temporal coupled mode theory. Our filters have important potential applications in high-density plasmonic integration circuits.
Lu
Hua
H
State Key Laboratory of Transient Optics and Photonics, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.
Liu
Xueming
X
Mao
Dong
D
Wang
Leiran
L
Gong
Yongkang
Y
D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D008962:Models, Theoretical; D049329:Nanostructures; D055096:Optical Devices; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods*