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Non-volatile 2 × 2 optical switch using multimode interference in an Sb₂Se₃-loaded waveguide.

Kun Shang, Lei Niu, Huimin Jin

|February 1, 2024

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We developed a novel non-volatile photonic switch using Sb2Se3-loaded waveguides. This compact device offers efficient switching with low loss and crosstalk, crucial for future optical circuits.

Area of Science:

Photonics
Materials Science
Integrated Optics

Background:

Non-volatile photonic switches are essential for advanced optical communication systems.
Phase-change materials offer unique properties for optical switching applications.

Purpose of the Study:

To propose and demonstrate a non-volatile 2x2 photonic switch.
To leverage the phase transition properties of Sb2Se3 for optical switching.

Main Methods:

Utilizing multimode interference in an Sb2Se3-loaded waveguide.
Employing finite-difference time-domain (FDTD) optimization for waveguide design.
Fabricating and characterizing the optical switch performance.

Main Results:

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Last Updated: Jul 4, 2025

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Achieved efficient switching due to distinct changes in propagation constants of TE0 and TE1 modes.

Demonstrated low insertion loss (~1 dB) and compact device length (~27 µm).

Exhibited low crosstalk (< -15 dB) over a 35 nm bandwidth.

Conclusions:

The developed photonic switch is non-volatile and broadband.
This technology is critical for high-density programmable photonic-integrated circuits.
Potential applications include optical communications and signal processing.