Abstract

We extend the control range of the $Q$ factor of a ring cavity that consists of a photonic crystal. The control range, which determines the storage time (high $Q$) and efficiency of input and output (low $Q$) of light, is required to be wide for the random-access memory of an optical pulse train. The conventional photonic-crystal ring cavity with a directional coupler and a hexagonal-shape ring waveguide has a very narrow range. We replace these components by a directional coupler having flat dispersion and a circularly curved ring waveguide. We experimentally varied the $Q$ factor by thermal modulation of the device and achieved a control range between $1.9\times {10}^3$ and $1.7\times {10}^4$.

©2012 Optical Society of America

Enhancement of the Q value of a microring resonator by introducing curved photonic crystal waveguides

Jun-ichiro Sugisaka, Noritsugu Yamamoto, Makoto Okano, Kazuhiro Komori, and Masahide Itoh
J. Opt. Soc. Am. B 29(7) 1599-1605 (2012)

GaAs-based two-dimensional photonic crystal slab ring resonator consisting of a directional coupler and bent waveguides

Seok-Hwan Jeong, Noritsugu Yamamoto, Jun-ichiro Sugisaka, Makoto Okano, and Kazuhiro Komori
J. Opt. Soc. Am. B 24(8) 1951-1959 (2007)

Proposal and demonstration of a controllable Q factor in directly coupled microring resonators for optical buffering applications

Ying Zhang, Qiang Liu, Chenyang Mei, Desheng Zeng, Qingzhong Huang, and Xinliang Zhang
Photon. Res. 9(10) 2006-2015 (2021)

Calculation of quasi dispersion curves and quality factors of coupled resonator optical waveguides in photonic-crystal slabs

Chih-Hsien Huang, Wei-Shuo Li, Jing-Nuo Wu, Wen-Feng Hsieh, and Yia-Chung Chang
J. Opt. Soc. Am. B 29(9) 2510-2515 (2012)

Numerical optimization of high-Q-factor photonic crystal microcavities with a graded air lattice

A. Benmerkhi, M. Bouchemat, T. Bouchemat, and N. Paraire
J. Opt. Soc. Am. B 28(2) 336-341 (2011)