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Updated: May 14, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Enhanced Sensing Enabled by Multi-Resonant QBIC-EIT and SP-BIC in Pyramidal LiNbO3 Metasurfaces.

Changqing Zhong1, Wei Zou1, Jiangtao Lei2

  • 1Department of Physics, School of Physics and Material Science, Nanchang University, Nanchang 330031, China.

Sensors (Basel, Switzerland)
|May 13, 2026
PubMed
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This study demonstrates a novel dielectric metasurface for optical sensing. It achieves high sensitivity for refractive index (RI) detection using dual resonances, enabling advanced sensing applications.

Area of Science:

  • Optical Sensing
  • Metasurface Technology
  • Nanophotonics

Background:

  • Electromagnetically induced transparency (EIT) and bound states in the continuum (BIC) enhance light-matter interactions via high-Q resonances.
  • Dielectric metasurfaces offer promising platforms for advanced optical sensing due to their tunable properties.

Purpose of the Study:

  • To theoretically demonstrate dual-resonance phenomena, quasi-symmetry-protected BIC (SP-BIC) and quasi-BIC-induced EIT-like (QBIC-EIT) resonance.
  • To investigate the polarization-dependent optical responses of a dielectric metasurface for refractive index (RI) sensing.

Main Methods:

  • Utilized a dielectric metasurface composed of pyramid-shaped lithium niobate nanoarrays operating in the near-infrared.
  • Analyzed the interference between surface lattice modes and toroidal dipole modes to understand QBIC-EIT origin.
Keywords:
bound states in the continuum (BIC)electromagnetically induced transparency (EIT)high Q-factorlithium niobate (LN) metasurfacesrefractive index (RI) sensing

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  • Investigated the metasurface's response under different polarization states (x- and y-polarized incidence).

    • Main Results:

    • Observed distinct polarization-dependent responses: single quasi-SP-BIC under x-polarization, and dual quasi-SP-BIC with QBIC-EIT under y-polarization.
    • Demonstrated high sensitivity of both quasi-SP-BIC (887.7 nm/RIU) and QBIC-EIT (404.9 nm/RIU) resonances to ambient refractive index changes.
    • Confirmed the metasurface's capability as a high-sensitivity RI sensor.

    Conclusions:

    • The developed metasurface enables multi-band detection for advanced RI sensing.
    • Findings contribute to the development of high-performance metasurface-based optical sensors.
    • The dual-resonance phenomena offer a new pathway for designing sensitive optical sensors.