Analysis and Design of Two-Dimensional Photonic Crystal Ring Resonators

• Main Authors: Jyun-Cheng Wu, 吳浚丞
• Other Authors: Rei-Shin Chen
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/74608611292991341564

碩士 === 龍華科技大學 === 電機工程系碩士班 === 100 === This work is focused on the design and analysis of ring resonators in two-dimensional photonic crystal. Four configurations of ring resonators are designed, including four-channel square cavity, two-channel square cavity, two-channel 45-degree square cavity, and two-channel circular cavity. The plane wave expansion method is used to calculate the photonic bandgap and dispersion relation of line-defect waveguides. The finite-difference time-domain method is employed to simulate light propagation in the ring resonators. According to simulation results, three of the four configurations exhibit nearly 100% transmission at resonant frequencies, except for the configuration based on four-channel square cavity. These ring resonators can serve as optical filters in fiber-optic communication systems. Moreover, the cavity length can be inferred according to the wave propagation pattern and waveguide dispersion curve. The inferred cavity length is found to be highly consistent with the physical cavity length.