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Quasi-bound flat bands in the continuum.

Haoyu Qin1,2, Weixuan Zhang3,4, Shaohu Chen5

  • 1Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education, School of Physics, Beijing Institute of Technology, Beijing, China.

Nature Communications
|December 2, 2025
PubMed
Summary
This summary is machine-generated.

Researchers introduce quasi-bound flat bands in the continuum (quasi-BFICs), a novel optical state. This new approach uses disorder to achieve high-quality resonances across all k-points, overcoming limitations of previous quasi-BICs.

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Area of Science:

  • Photonics
  • Condensed Matter Physics
  • Optical Metamaterials

Background:

  • Bound states in the continuum (BICs) offer high-quality resonances in photonic structures.
  • Existing quasi-BICs are limited to narrow k-space ranges and are sensitive to disorder.

Purpose of the Study:

  • Introduce quasi-bound flat bands in the continuum (quasi-BFICs) as a new class of optical states.
  • Overcome the limitations of quasi-BICs by enabling quasi-BIC behavior across all k-points.

Main Methods:

  • Analytical and numerical demonstrations of quasi-BFIC origin.
  • Investigating disorder-induced band folding, mode localization, and topological charges.
  • Experimental validation using angle-resolved transmission and Q-factor measurements.

Main Results:

  • Quasi-BFICs exhibit quasi-BIC behavior at every k-point above the light line.
  • Disorder-induced band folding and topological charges are identified as key mechanisms.
  • Optimal disorder strength for maximizing quasi-BFIC generation is determined.

Conclusions:

  • Quasi-BFICs leverage structural disorder to achieve wide-angle, high-quality optical resonances.
  • This work presents a counterintuitive strategy using disorder to enhance photonic device performance.
  • Opens new avenues for designing advanced photonic devices with improved functionalities.