Compact nonvolatile polarization switch using an asymmetric Sb₂Se₃-loaded silicon waveguide.

Area of Science:

• Photonics
• Materials Science
• Semiconductor Devices

Background:

• Silicon photonics enables integrated optical circuits.
• Polarization control is crucial for optical communication systems.
• Nonvolatile phase-change materials offer reconfigurable photonic functionalities.

Purpose of the Study:

• To propose and simulate a compact nonvolatile polarization switch.
• To achieve efficient switching between TE0 and TM0 modes.
• To leverage the phase change properties of Sb2Se3 in a silicon photonic waveguide.

Main Methods:

• Design of an asymmetric Sb2Se3-clad silicon photonic waveguide.
• Simulation of polarization switching based on Sb2Se3 phase modulation (amorphous vs. crystalline).
• Analysis of two-mode interference and its effect on polarization conversion.

Main Results:

• A compact polarization switch (∼29.5 µm) was simulated.
• High polarization extinction ratio (>20 dB) achieved.
• Ultra-low excess loss (<0.22 dB) observed across a wide wavelength range (1520-1585 nm).

Conclusions:

• The proposed device offers efficient and nonvolatile polarization switching.
• The Sb2Se3 material enables effective control over polarization states.
• The design shows promise for advanced photonic integrated circuits.