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Topological converter for high-efficiency coupling between Si wire waveguide and topological waveguide.

Hibiki Kagami, Tomohiro Amemiya, Shou Okada

|October 29, 2020

Summary

Researchers developed a novel topological converter for optical circuits. This device significantly improves coupling efficiency between silicon wire waveguides and topological edge waveguides, enhancing optical vortex control.

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Area of Science:

Photonics
Condensed Matter Physics
Nanotechnology

Background:

Topological photonic systems offer advanced control over light propagation.
Integrating these systems with conventional silicon photonics is crucial for practical applications.
Efficient coupling between different waveguide types remains a challenge.

Purpose of the Study:

To design and fabricate a topological converter for efficient coupling between silicon wire waveguides and topological edge waveguides.
To demonstrate enhanced control of optical vortices in integrated photonic circuits.

Main Methods:

Waveguide design involving gradual width transition and nanoholes in a honeycomb lattice with C6 symmetry.
Three-dimensional finite-difference time-domain (FDTD) method for analysis.
Fabrication and experimental evaluation of the proposed device.

Main Results:

Achieved a coupling efficiency of -4.49 dB/taper between silicon wire and topological edge waveguides.
Demonstrated a 5.12 dB/taper improvement in coupling efficiency compared to direct connection.
Successfully integrated a topological converter into a silicon photonic circuit.

Conclusions:

The developed topological converter enables high-efficiency coupling between silicon wire and topological edge waveguides.
This technology facilitates the integration of topological photonics into conventional optical circuits.
The findings pave the way for advanced optical vortex manipulation in photonic devices.