Title :
Comparison of Q-Factors Between TE and TM Modes in 3-D Microsquares by FDTD Simulation
Author :
Yang, Yue-De ; Huang, Yong-Zhen ; Chen, Qin
Author_Institution :
Chinese Acad. of Sci., Beijing
Abstract :
Mode characteristics of three-dimensional (3-D) microsquare resonators are investigated by finite-difference time-domain (FDTD) simulation for the transverse electric (TE)-like and the transverse magnetic (TM)-like modes. For a pillar microsquare with a side length of 2 mum in air, we have Q-factors about 5 times 103 for TM-like modes at the wavelength of 1550 nm, which are one order larger than those of TE-like modes, as vertical refractive index distribution is 3.17/3.4/3.17 and the corresponding center layer thickness is 0.2 mum. The mode field patterns show that TM-like modes have much weaker vertical radiation coupling loss than TE-like modes. TM-like modes can have high Q-factors in a microsquare with weak vertical field confinement.
Keywords :
finite difference time-domain analysis; micro-optomechanical devices; microcavities; micromechanical resonators; optical losses; optical resonators; refractive index; 3-D microsquares resonators; FDTD simulation; Q-factors; TE modes; TM modes; finite-difference time-domain simulation; size 0.2 mum; size 2 mum; transverse electric-like modes; transverse magnetic-like modes; vertical radiation coupling loss; vertical refractive index distribution; wavelength 1550 nm; weak vertical field confinement; Finite difference methods; Microcavities; Numerical simulation; Optical filters; Optical refraction; Optical resonators; Q factor; Refractive index; Tellurium; Time domain analysis; $Q$-factors; Finite-difference time-domain (FDTD) methods; microcavities; microsquare resonators;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.907639
