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Updated: Jun 4, 2025

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

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Published on: April 4, 2017

Photonic Supercoupling in Silicon Topological Waveguides.

Ridong Jia^1,2, Yi Ji Tan^1,2, Nikhil Navaratna^1,2

¹Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.

Advanced Materials (Deerfield Beach, Fla.)

|December 17, 2024

Summary

Researchers demonstrate photonic supercoupling for enhanced control of waveguide interconnects in integrated circuits. This breakthrough achieves high coupling ratios and isolation over long distances, advancing chip density and performance.

Keywords:

THz on‐chip photonics THz topological photonic integrated circuits silicon THz interconnect topological supercoupling

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Last Updated: Jun 4, 2025

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Area of Science:

Photonics
Integrated Optics
Condensed Matter Physics

Background:

Achieving precise control over waveguide interconnects is crucial for high-density photonic integrated circuits (PICs).
A key challenge in PICs is simultaneously realizing strong waveguide isolation and efficient long-range coupling.
Existing methods struggle to balance coupling efficiency and isolation over extended separations.

Purpose of the Study:

To demonstrate a novel photonic supercoupling phenomenon for enhanced waveguide coupling.
To achieve simultaneous strong isolation and efficient long-range coupling in integrated photonic devices.
To explore new design paradigms for optimizing coupling and isolation in PICs.

Main Methods:

Leveraging tunable mode tails and vortex energy flow within a topological valley Hall system.
Developing and fabricating a supercoupled integrated chip.
Characterizing coupling ratios and isolation levels at various waveguide separations.

Main Results:

Demonstrated photonic supercoupling over waveguide separations from 0.25λ to 5λ.
Achieved a 91% coupling ratio and -30 dB isolation simultaneously over 2.8λ separations.
Showcased supercoupled devices including a waveguide-cavity system (3.2λ excitation) and a compact directional supercoupler (λ²/4 area).

Conclusions:

Photonic supercoupling offers a novel approach to control waveguide coupling and isolation in PICs.
The demonstrated supercoupling significantly outperforms conventional devices in terms of efficiency and isolation.
This technology facilitates new applications in on-chip sensing, lasing, and telecommunications.