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Chin. Phys. B, 2008, Vol. 17(7): 2553-2556    DOI: 10.1088/1674-1056/17/7/035
CLASSICAL AREAS OF PHENOMENOLOGY Prev   Next  

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)
Nano-Optoelectronic Laboratory, Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
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.
Keywords:  photonic crystal      polarization beam splitter      directional coupler  
Received:  05 June 2007      Revised:  01 January 2008      Accepted manuscript online: 
PACS:  42.82.Et (Waveguides, couplers, and arrays)  
  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)  
Fund: Project supported by National Key Basic Research Special Fund of China (Grand No 2006CB921701-705).

Cite this article: 

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) Design of a compact polarization beam splitter based on a deformed photonic crystal directional coupler 2008 Chin. Phys. B 17 2553

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