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Phase-Controlled Fano Resonances in Hybrid Metasurfaces.

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  • 1Fudan University, Shanghai 200437, China.

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Summary
This summary is machine-generated.

This study introduces a hybrid system coupling quasi-bound states in the continuum (qBIC) with a Fabry-Pérot cavity. This enables tunable high-Q resonances for advanced photonic applications and sensing.

Keywords:
Fano resonancecoupled-mode theoryhybrid metasurfaceoptical sensingphase interference

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Area of Science:

  • Photonics and Metamaterials
  • Optical Sensing

Background:

  • Quasi-bound states in the continuum (qBIC) exhibit high-quality factors and far-field coupling, suitable for lasers and sensors.
  • Fano interference in hybrid systems can create tunable resonances.

Purpose of the Study:

  • To develop a hybrid dielectric-metallic system coupling qBIC with a Fabry-Pérot cavity.
  • To achieve tunable high-Q resonances via Fano interference.
  • To explore phase-tunable photonic platforms for light-matter interaction and sensing.

Main Methods:

  • Coupled-mode theory to analytically model the interaction between qBIC and cavity modes.
  • Full-wave simulations to validate theoretical predictions.
  • Experimental realization in the near-infrared spectrum.

Main Results:

  • Demonstrated tunable Q factor, Fano asymmetry inversion, and phase singularity behavior.
  • Achieved a maximum Q factor of 2.9 × 10^4 near the phase singularity.
  • Observed a high refractive index sensitivity of 732 nm·RIU^-1.

Conclusions:

  • The hybrid system offers a phase-tunable platform for strong light-matter interactions.
  • The demonstrated tunability and high sensitivity are promising for high-performance optical sensing applications.