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All-LCP Terahertz Metasensor with Dual Quasi-BIC Resonances for Dual-Range Refractive Index Sensing.

Yan Zhang1, Mengya Pan1, Qiankai Hong1

  • 1School of Integrated Circuits, Shandong University, Jinan 250100, China.

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Summary

This study introduces a novel liquid-crystal-polymer (LCP) terahertz (THz) metasensor for refractive index sensing. The dual quasi-bound states in the continuum (quasi-BIC) resonances achieve high spectral resolution and stable readout across different regimes.

Keywords:
all-LCP metasurfacebiosensingdifferential readoutdual quasi-BIC resonancesrefractive-index sensingterahertz metasensor

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Area of Science:

  • Photonics and Metamaterials
  • Biosensing Technologies
  • Terahertz Spectroscopy

Background:

  • Terahertz (THz) metasurface biosensors face challenges in achieving high spectral resolution and stable refractive index (RI) readout.
  • Existing THz biosensors struggle with performance across diverse RI regimes.

Purpose of the Study:

  • To propose and demonstrate an all-liquid-crystal-polymer (LCP) THz metasensor for regime-dependent refractive index sensing.
  • To achieve high spectral resolution and stable readout using dual quasi-bound states in the continuum (quasi-BIC) resonances.

Main Methods:

  • Fabrication of a periodic LCP cubic-cluster metasurface with introduced structural asymmetry.
  • Excitation and analysis of dual quasi-BIC resonances with high quality factors (Q factors) of 6811 and 2526.
  • Investigation of near-field distributions and multipole decomposition to understand resonance characteristics.

Main Results:

  • The metasensor exhibits distinct electromagnetic features for its two resonances, leading to different responses to dielectric perturbations.
  • In the low RI range (1.0-1.5), linear responses with sensitivities of 122 GHz/RIU and 179 GHz/RIU were observed.
  • In the higher RI range (1.5-1.8), the intermodal frequency difference provided a robust differential readout scheme.

Conclusions:

  • The all-LCP dual-quasi-BIC metasensor enables high-resolution THz refractive index sensing.
  • A regime-dependent spectral readout approach is established for different dielectric-response intervals, enhancing sensor robustness.