双折射
材料科学
光学
各向同性
折射率
极化(电化学)
偏振旋转器
波导管
硅
光电子学
光子晶体
物理
物理化学
化学
作者
Liying Liu,Hong-Chang Huang,Chuwen Chen,Fu‐Li Hsiao,Yu-Chieh Cheng,Chii‐Chang Chen
出处
期刊:Nanomaterials
[MDPI AG]
日期:2022-10-21
卷期号:12 (20): 3694-3694
被引量:2
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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