Design of Reflective Polarization Rotator in Silicon Waveguide

Li Ying Liu, Hong Chang Huang, Chu Wen Chen, Fu Li Hsiao, Yu Chieh Cheng, Chii Chang Chen

研究成果: 雜誌貢獻期刊論文同行評審

摘要

In this work, we investigate theoretically the reflective polarization rotator in a silicon waveguide formed by periodically arranged rectangular air holes. The etched air holes generate the large birefringence for the waveguide. The effective refractive index of the non-etched waveguide is isotropic. The structure can be regarded as a stack of alternating birefringent waveplates and isotropic material similar to the folded Šolc filter. The band structure of the stack of birefringent waveplates with isotropic background is calculated to confirm the fact that high reflection peaks in the reflection spectra of the waveguide result from the photonic bandgap. The polarization extinction ratio for the reflected light is 15.8 dB. The highest reflectivity of the device is 93.1%, and the device length is 9.21 μm. An ultra-wide operation bandwidth from 1450.3 to 1621.8 nm can be achieved.

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文章編號3694
期刊Nanomaterials
12
發行號20
DOIs
出版狀態已出版 - 10月 2022

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