Design and optimization of beam-splitting polarizing filter based on two-dimensional photonics crystal

作者：Wang Chen Ge; Zhang Cai Ni^*; Chen Kan; Huang Teng Chao; Shu Xiao Wu; Liu Cheng

来源：Acta Photonica Sinica, 2014, 43(12): 1223002.

DOI：10.3788/gzxb20144312.1223002

• Beam splitting
• Buffer
• Design and optimization
• Finite different time domain method
• Micro-structure parameters
• Photonics crystals
• Plane wave expansion method
• Polarizing filter

A kind of beam-splitting polarizing filter based on two-dimensional photonics crystal was proposed. The photonic bandgap was calculated by plane wave expansion method to confirm the micro-structure parameters, with which single polarized beam in 1550 nm can be obtained;Finite-different time-domain method was used to optimize the 90°bending buffer layer and impacting wall of beam-splitter. This device indeed is a waveguide fabricated by introducing defect in two-dimensional photonics crystal array, a single polarization source can be obtained by using photonics band gap and 90°linear defect to filter a certain polarization completely off. By the construction of Y-shaped defect, an approximate splitting ration of 1:1 is achieved. Through the optimization of the 90°linear defect and buffer layer, a ratio of 68% between the output power and input power is finally gained.

• 出版日期2014
• 单位浙江大学