Title :
Simulations of Dielectric and Plasmonic Waveguide-Coupled Ring Resonators Using the Legendre Pseudospectral Time-Domain Method
Author :
Chung, Shih-Yung ; Wang, Chih-Yu ; Teng, Chun-Hao ; Chen, Chung-Ping ; Chang, Hung-chun
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
fDate :
6/1/2012 12:00:00 AM
Abstract :
The accurate Legendre pseudospectral time-domain (PSTD) method is applied in this paper to the study of optical behaviors of 2-D dielectric and plasmonic waveguide-coupled ring resonators. Based on its inherent multidomain scheme with curvilinear-quadrilateral subdomain partitioning, the PSTD method possesses superior advantage in fulfilling field continuity conditions across material interfaces, which provides better numerical handling upon circular or even more complicated ring structures. Accordingly, investigations of several plasmonic nanoring resonators of different shapes with surface plasmon polariton (SPP) waves propagating on the metal/dielectric/metal waveguides are made with the aids of a well-fitted Drude-Lorentz material-dispersion model through analyzing their characteristics in the near-infrared and visible parts of the light spectrum. Especially, the racetrack-shaped ring is carefully designed with optimized track length to avoid the over- or under-coupling problem between the ring and input waveguides and, thus, achieve excellent spectral performance.
Keywords :
optical waveguides; plasmonics; surface plasmon resonance; Legendre pseudospectral time-domain method; dielectric waveguide; field continuity conditions; light spectrum; multidomain scheme; optical behaviors; plasmonic waveguide-coupled ring resonators; racetrack-shaped ring; surface plasmon polariton waves; well-fitted Drude-Lorentz material-dispersion model; Dielectrics; Finite difference methods; Optical ring resonators; Optical waveguides; Plasmons; Structural rings; Time domain analysis; Pseudospectral time-domain (PSTD) method; ring resonators; surface plasmon polaritons (SPPs);
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2012.2188851