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Full-Control and Switching of Optical Fano Resonance by Continuum State Engineering.

Joo Hwan Ko1, Jin-Hwi Park2, Young Jin Yoo1,3

  • 1School of Electrical Engineering and Computer Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 10, 2023
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Summary

Researchers developed a switchable Fano resonator using porous thin films for enhanced sensing. This novel optical device offers controllable spectral shapes, improving detection accuracy for low-refractive-index materials and bio-particles.

Keywords:
Fano resonanceFano state tuningactive color filtersbio-sensorsinverse designs

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Area of Science:

  • Photonics
  • Optical Sensing
  • Materials Science

Background:

  • Fano resonance, characterized by its asymmetric spectral line shape, is crucial in photonics for sensing applications.
  • Achieving controllable Fano parameters often requires complex geometric structures, posing a significant challenge.

Purpose of the Study:

  • To propose and demonstrate a novel thin-film optical Fano resonator with a porous layer for tunable spectral shapes.
  • To develop an inverse design tool for optimizing Fano resonator parameters efficiently.

Main Methods:

  • Utilizing glancing angle deposition to fabricate a polarization-dependent Fano resonator.
  • Employing s- and p-polarization switching to achieve tunable spectral states (quasi-Lorentzian to Fano).
  • Developing an inverse design tool based on a multilayer perceptron model for parameter optimization.

Main Results:

  • Demonstrated a switchable Fano device capable of transitioning between quasi-Lorentz and negative Fano states.
  • Achieved enhanced signal-to-noise ratio and prediction accuracy in bio-particle sensing experiments.
  • The inverse design tool significantly improved accuracy (MVF = 0.07) compared to conventional methods (MVF = 0.37).

Conclusions:

  • The proposed porous thin-film Fano resonator offers a simple yet effective platform for controllable Fano parameters and enhanced sensing.
  • The developed inverse design tool addresses the optimization challenges in complex thin-film Fano resonators.
  • This approach holds promise for advanced optical sensing applications, particularly for low-refractive-index materials.