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

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

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.

Original languageEnglish
Article number3694
JournalNanomaterials
Volume12
Issue number20
DOIs
StatePublished - Oct 2022

Keywords

  • birefringent
  • photonic crystals
  • polarization rotator
  • waveguide

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