Abstract
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.
Highlights
Surface plasmon polaritons (SPPs) are waves trapped on the surfaces of metals owing to the interaction between the free electrons in metal and electromagnetic field in dielectric, and attenuating exponentially in the direction perpendicular to the interface [1,2]
Another result obtained by finite-difference time-domain (FDTD) simulations demonstrates that the bandwidths of resonance spectra can be manipulated by the coupling distance between the nanocavity and waveguides, which is analyzed exactly by temporal coupled mode theory
A simple and ease of fabrication plasmonic filter based on MIM waveguides with a nanodisk resonator is proposed
Summary
Surface plasmon polaritons (SPPs) are waves trapped on the surfaces of metals owing to the interaction between the free electrons in metal and electromagnetic field in dielectric, and attenuating exponentially in the direction perpendicular to the interface [1,2]. Some simple plasmonic waveguide filters have been proposed, such as tooth-shaped plasmonic waveguide filters [15,16], channel drop filters with disk resonators [17], rectangular geometry resonators [2, 18], and ring resonators [17, 19] They overcome the complexity of fabrication of Bragg reflectors and decrease the prorogation length for SPPs. There exist two types of plasmonic filters in MIM waveguides, i.e., band-pass and band-stop filters. The wavelength-shift properties of resonant modes in the nanocavity calculated by the resonant theory of disk-shaped naocavity are validated by finite-difference time-domain (FDTD) method [21] Another result obtained by FDTD simulations demonstrates that the bandwidths of resonance spectra can be manipulated by the coupling distance between the nanocavity and waveguides, which is analyzed exactly by temporal coupled mode theory. Received 8 Jun 2010; revised 17 Jul 2010; accepted 26 Jul 2010; published 5 Aug 2010 August 2010 / Vol 18, No / OPTICS EXPRESS 17923
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