Design of a compact polarization beam splitter based on a deformed photonic crystal directional coupler |
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Authors: | Ren Gang Zheng Wan-Hu Wang Ke Du Xiao-Yu Xing Ming-Xin and Chen Liang-Hui |
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Institution: | Nano-Optoelectronic Laboratory, Institute of
Semiconductors, Chinese
Academy of Sciences, Beijing 100083, China |
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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. |
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Keywords: | photonic crystal polarization
beam splitter directional coupler |
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