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Brillouin zone folding driven bound states in the continuum.

Wenhao Wang1,2,3, Yogesh Kumar Srivastava2,3,4, Thomas CaiWei Tan2,3

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Researchers engineered Brillouin zone folding-induced bound states in the continuum (BZF-BICs) to achieve ultrahigh quality (Q) factors. This breakthrough offers robust, tunable BICs for advanced photonic devices.

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Area of Science:

  • Photonics and Metasurfaces
  • Condensed Matter Physics

Background:

  • Non-radiative bound states in the continuum (BICs) enable high-quality factor (Q) resonant cavities.
  • Conventional BICs exhibit limited utility due to sharp Q factor decay in momentum space.

Purpose of the Study:

  • To develop a method for achieving sustainable ultrahigh Q factors in BICs.
  • To overcome the momentum-space limitations of conventional BICs for device applications.

Main Methods:

  • Engineered Brillouin zone folding (BZF) to induce BICs (BZF-BICs).
  • Utilized periodic perturbations to fold guided modes into the light cone.
  • Investigated the Q factor enhancement and robustness of BZF-BICs against structural disorders.

Main Results:

  • Demonstrated emergence of BZF-BICs with ultrahigh Q factors across a large, tunable momentum space.
  • Observed perturbation-dependent Q factor enhancement in the entire momentum space.
  • Showcased robustness of BZF-BICs against structural disorders.

Conclusions:

  • BZF-BICs offer a unique design for silicon metasurface cavities with extreme robustness and sustained ultrahigh Q factors.
  • Potential applications include terahertz devices, nonlinear optics, quantum computing, and photonic integrated circuits.