Tunable drop filters based on photonic crystal self-collimation ring resonators

Junjun Li; Xiyao Chen; Xiaofu Xu; Junzhen Jiang; Zexuan Qiang; Guimin Lin; Hao Zhang

doi:10.1117/12.870624

17 November 2010 Tunable drop filters based on photonic crystal self-collimation ring resonators

Junjun Li, Xiyao Chen, Xiaofu Xu, Junzhen Jiang, Zexuan Qiang, Guimin Lin, Hao Zhang

Proceedings Volume 7847, Optoelectronic Devices and Integration III; 78472X (2010) https://doi.org/10.1117/12.870624
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

A tunable drop filter (TDF) based on two-dimensional photonic crystal (PC) self-collimation ring resonator (SCRR) is proposed. The PC consisting of square-lattice air cylinders in silicon has square-shaped equal frequency contours (EFCs) in the wavevector space at the frequencies between 0.172-0.188c/a for TE modes. The SCRR includes two mirrors and two splitters. The air holes inside the SCRR are infiltrated with a kind of liquid crystal whose ordinary and extraordinary refractive indices are 1.522 and 1.706, respectively. The effective refractive index n_eff of liquid crystal depends on the applied electric field. Simulated with the FDTD method, the transmission spectra at the drop port of SCRR are in the shape of sinusoidal curves with uniform peak spacing between 0.172-0.188c/a. Transmission peaks will shift to the lower frequencies when n_eff is increased. When n_eff changes from 1.522 to 1.706, the peaks will experience red-shift over 0.003c/a. So this SCRR can work as a tunable drop filter. For the operating wavelength around 1550nm, its dimensions are only tens of microns.

Citation Download Citation

Junjun Li, Xiyao Chen, Xiaofu Xu, Junzhen Jiang, Zexuan Qiang, Guimin Lin, and Hao Zhang "Tunable drop filters based on photonic crystal self-collimation ring resonators", Proc. SPIE 7847, Optoelectronic Devices and Integration III, 78472X (17 November 2010); https://doi.org/10.1117/12.870624

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