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Updated: Dec 1, 2025

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Coherent Interactions in One-Dimensional Topological Photonic Systems and Their Applications in All-Optical Logic

Yuhui Wang1, Wenjing Liu1, Zhurun Ji1

  • 1Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.

Nano Letters
|November 6, 2020
PubMed
Summary

Researchers developed a novel coupled topological interface system for photonics, enabling tunable optical devices. This system demonstrates robust, isolated interface modes and enables the creation of all-optical logic circuits.

Keywords:
Su-Schrieffer-Heeger (SSH) modelTopological photonicsall-optical logic operationcoherent interactioncoupled-waveguide array

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Area of Science:

  • Topological photonics
  • Condensed matter physics
  • Optical device engineering

Background:

  • Topological photonics leverages bulk-edge correspondence for robust interfacial states.
  • Single-topological interface modes lack tunability, limiting optical device applications.

Purpose of the Study:

  • To investigate coupled-waveguide arrays mimicking a 1D Su-Schrieffer-Heeger system.
  • To enhance device versatility and tunability using coupled topological interfaces.
  • To demonstrate the potential for on-chip topological optical devices.

Main Methods:

  • Coupled-waveguide arrays mapped to a 1D Su-Schrieffer-Heeger model.
  • Experimental observation of coupled interface mode oscillations.
  • Theoretical confirmation of state isolation via eigenstate localization calculations.

Main Results:

  • Coupled topological interfaces offer enhanced versatility and tunability.
  • Oscillations between coupled interfaces were experimentally observed.
  • Coupled interface states exhibit spatial and energetic isolation comparable to single-interface states.

Conclusions:

  • The coupled interface configuration maintains topological protection while improving device control.
  • This approach paves the way for advanced on-chip topological optical circuits.
  • A proof-of-principle all-optical logic circuit was successfully fabricated.