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

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 neff 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 neff is increased. When neff 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.

[1]  Li Haipeng,et al.  New Configuration of Ring Resonator in Photonic Crystal Based on Self-Collimation * , 2008 .

[2]  E. Yablonovitch,et al.  Inhibited spontaneous emission in solid-state physics and electronics. , 1987, Physical review letters.

[3]  Deyin Zhao,et al.  Photonic crystal Mach-Zehnder interferometer based on self-collimation , 2007 .

[4]  Hae Yong Park,et al.  Line-defect-induced bending and splitting of self-collimated beams in two-dimensional photonic crystals , 2005 .

[5]  Hae Yong Park,et al.  Experimental demonstration of bending and splitting of self-collimated beams in two-dimensional photonic crystals , 2007 .

[6]  K.M. Johnson,et al.  High-speed wavelength tunable liquid crystal filter , 1995, IEEE Photonics Technology Letters.

[7]  Dennis W. Prather,et al.  Tunable Photonic Crystal Based on SOI , 2007 .

[8]  Shouyuan Shi,et al.  Optimizing bending efficiency of self-collimated beams in non-channel planar photonic crystal waveguides. , 2003, Optics express.

[9]  D. Prather,et al.  A high-efficiency in-plane splitting coupler for planar photonic Crystal self-collimation devices , 2005, IEEE Photonics Technology Letters.

[10]  Jeremy Witzens,et al.  Self-collimation in planar photonic crystals , 2002 .

[11]  Mayank Bahl,et al.  Optically tunable superprism effect in nonlinear photonic crystals. , 2003, Optics letters.

[12]  Shanhui Fan,et al.  Bends and splitters for self-collimated beams in photonic crystals , 2003 .

[13]  L. Thylen,et al.  Widely tunable directional coupler filters with 1D photonic crystal , 2005, Proceedings of 2005 7th International Conference Transparent Optical Networks, 2005..

[14]  Masaya Notomi,et al.  Superprism Phenomena in Photonic Crystals , 1998 .

[15]  John,et al.  Strong localization of photons in certain disordered dielectric superlattices. , 1987, Physical review letters.

[16]  Masaya Notomi,et al.  Self-collimating phenomena in photonic crystals , 1999 .

[17]  Tao Chu,et al.  Tunable Optical Notch Filter Realized by Shifting the Photonic Bandgap in a Silicon Photonic Crystal Line-Defect Waveguide , 2006, IEEE Photonics Technology Letters.

[18]  Xianfeng Chen,et al.  Tunable Solc-type filter in periodically poled LiNbO(3) by UV-light illumination. , 2006, Optics express.

[19]  Ping Shum,et al.  Tunable Mach-Zehnder interferometer in a two-dimensional photonic crystal with liquid crystal infiltration , 2007, SPIE Optics East.

[20]  Y. Omura,et al.  Optically tunable narrowband filter using defect-induced pass-band in photonic crystal waveguide , 2003, 2003 IEEE International Conference on SOI.