中国物理B ›› 2008, Vol. 17 ›› Issue (7): 2553-2556.doi: 10.1088/1674-1056/17/7/035
任刚, 郑婉华, 王科, 杜晓宇, 邢名欣, 陈良惠
Ren Gang(任刚), Zheng Wan-Hua(郑婉华)†, Wang Ke(王科), Du Xiao-Yu(杜晓宇), Xing Ming-Xin(邢名欣), and Chen Liang-Hui(陈良惠)
摘要: In this paper a compact polarization beam splitter based on a deformed photonic crystal directional coupler is designed and simulated. The transverse-electric (TE) guided mode and transverse-magnetic (TM) guided mode are split due to different guiding mechanisms. The effect of the shape deformation of the air holes on the coupler is studied. It discovered that the coupling strength of the coupled waveguides is strongly enhanced by introducing elliptical airholes, which reduce the device length to less than 18.5$\mu$m. A finite-difference time-domain simulation is performed to evaluate the performance of the device, and the extinction ratios for both TE and TM polarized light are higher than 20\,dB.
中图分类号: (Waveguides, couplers, and arrays)