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Design of Reflective Polarization Rotator in Silicon Waveguide.

Li-Ying Liu1, Hong-Chang Huang1, Chu-Wen Chen1

  • 1Department of Optics and Photonics, National Central University, Taoyuan 320317, Taiwan.

Nanomaterials (Basel, Switzerland)
|October 27, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a novel silicon waveguide reflective polarization rotator utilizing periodic air holes. The device achieves high reflectivity and ultra-wide bandwidth, offering a compact solution for polarization control.

Keywords:
birefringentphotonic crystalspolarization rotatorwaveguide

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Area of Science:

  • Photonics and optical engineering
  • Materials science for optical devices

Background:

  • Silicon waveguides are crucial for integrated optics.
  • Controlling light polarization is essential for optical communication and sensing.
  • Birefringence in waveguides can be engineered for polarization manipulation.

Purpose of the Study:

  • To theoretically investigate a reflective polarization rotator in a silicon waveguide.
  • To explore the use of periodically arranged air holes to induce birefringence.
  • To analyze the device's performance in terms of reflectivity, extinction ratio, and bandwidth.

Main Methods:

  • Theoretical investigation of a silicon waveguide with periodically arranged rectangular air holes.
  • Modeling the structure as a stack of birefringent waveplates and isotropic material.
  • Calculating the band structure to understand photonic bandgap effects on reflection.
  • Analyzing reflection spectra to determine device performance parameters.

Main Results:

  • Achieved a polarization extinction ratio of 15.8 dB for reflected light.
  • Demonstrated a maximum reflectivity of 93.1% within a device length of 9.21 μm.
  • Obtained an ultra-wide operation bandwidth from 1450.3 to 1621.8 nm.

Conclusions:

  • The proposed silicon waveguide structure effectively functions as a reflective polarization rotator.
  • Photonic bandgap effects are responsible for the high reflection peaks observed.
  • The device offers a promising compact and ultra-wideband solution for polarization control in silicon photonics.