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Multiple symmetry protected BIC lines in two dimensional synthetic parameter space.

Fengyuan Zhang1, Qiongqiong Chu1, Qiang Wang1

  • 1National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, Jiangsu 210093, China.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary

Researchers created a 2D parameter space using nanohole metasurfaces to tune multiple bound states in the continuum (BICs). This advancement enhances BIC device performance for applications like sensors and nanolasers.

Keywords:
BIC linesbound states in the continuumnanohole metasurfacesynthetic parameter space

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Area of Science:

  • Photonics and Metamaterials
  • Nanotechnology
  • Optical Physics

Background:

  • Bound states in the continuum (BICs) exhibit unique optical properties like infinite quality factors and wave localization.
  • Existing BIC devices require more tunable parameters for enhanced optical performance and practical applications.

Purpose of the Study:

  • To develop a 2D synthetic parameter space for effectively tuning multiple BICs.
  • To improve the tunability and optical performance of BIC-based devices.

Main Methods:

  • Fabrication of a nanohole metasurface array to create a 2D synthetic parameter space.
  • Theoretical investigation of symmetry-protected BIC modes and their evolution.
  • Experimental measurement of absorption spectra to validate BIC tuning.

Main Results:

  • Achieved multiple symmetry-protected BIC modes with high Q factors at high-order symmetry points.
  • Demonstrated BIC lines formed by a series of BIC modes within the 2D parameter space by manipulating asymmetry.
  • Experimental results for tuning multiple BICs using synthetic asymmetry parameters showed good agreement with theoretical predictions.

Conclusions:

  • The proposed 2D synthetic parameter space offers enhanced control over BICs.
  • This design provides new insights for on-chip applications including nonlinear devices, nanolasers, and high-resolution sensors.