Design of Waveguide Polarization Convertor Based on Asymmetric 1D Photonic Crystals

Area of Science:

• Photonics
• Metamaterials
• Quantum Computing Optics

Background:

• Integrated optical circuits are vital for quantum computing.
• Photonic crystals offer unique dispersion properties for designing miniaturized optical components.
• Square waveguides typically support transverse electric or transverse magnetic polarization modes.

Purpose of the Study:

• To design a photonic crystal-based half-waveplate element.
• To achieve 90° polarization rotation for light in a waveguide.
• To leverage photonic crystal dispersion relations for component design.

Main Methods:

• Utilized the unique dispersion relation of photonic crystals.
• Calculated polarization rotation length based on photonic crystal properties.
• Determined the optical axis's angle deviation in the eigenmode.

Main Results:

• Successfully designed a half-waveplate element using photonic crystal structures.
• Demonstrated effective calculation of polarization rotation length and optical axis deviation.
• Achieved favorable polarization rotation performance.

Conclusions:

• Photonic crystal half-waveplates can effectively rotate light polarization by 90°.
• This design reduces insertion loss in optical components.
• The approach is suitable for miniaturized optical components in quantum computing.