中国物理B ›› 2008, Vol. 17 ›› Issue (7): 2553-2556.doi: 10.1088/1674-1056/17/7/035

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Design of a compact polarization beam splitter based on a deformed photonic crystal directional coupler

任刚, 郑婉华, 王科, 杜晓宇, 邢名欣, 陈良惠   

  1. Nano-Optoelectronic Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
  • 收稿日期:2007-06-05 修回日期:2008-01-01 出版日期:2008-07-09 发布日期:2008-07-09
  • 基金资助:
    Project supported by National Key Basic Research Special Fund of China (Grand No 2006CB921701-705).

Design of a compact polarization beam splitter based on a deformed photonic crystal directional coupler

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)   

  1. Nano-Optoelectronic Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
  • Received:2007-06-05 Revised:2008-01-01 Online:2008-07-09 Published:2008-07-09
  • Supported by:
    Project supported by National Key Basic Research Special Fund of China (Grand No 2006CB921701-705).

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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.

关键词: photonic crystal, polarization beam splitter, directional coupler

Abstract: 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.

Key words: photonic crystal, polarization beam splitter, directional coupler

中图分类号:  (Waveguides, couplers, and arrays)

  • 42.82.Et
42.79.Fm (Reflectors, beam splitters, and deflectors) 42.79.Gn (Optical waveguides and couplers) 42.79.Sz (Optical communication systems, multiplexers, and demultiplexers?) 42.82.Bq (Design and performance testing of integrated-optical systems)