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Published on: August 30, 2012
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Ultrasensitive metasurface sensor based on quasi-bound states in the continuum
Ning Li1, He Chen1, Yunxia Zhao1
1Beijing Engineering Research Center of Mixed Reality and Advanced Display, Beijing Institute of Technology, Beijing 100081, China.
Nanophotonics (Berlin, Germany)
|February 20, 2025
Summary
We developed an ultrasensitive dielectric metasurface sensor using amorphous silicon pillars. This sensor leverages quasi-bound states in the continuum (quasi-BICs) for enhanced light-analyte interactions, achieving high sensitivity for sensing applications.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
- Nanotechnology
Background:
- Dielectric metasurfaces offer a promising platform for sensing due to quasi-bound states in the continuum (quasi-BICs).
- High Q-factor quasi-BICs enhance light-analyte interactions, crucial for sensitive detection.
- Amorphous silicon metasurfaces are explored for their potential in optical sensing applications.
Purpose of the Study:
- To propose and demonstrate an ultrasensitive all-dielectric metasurface sensor.
- To investigate the excitation of high Q-factor quasi-BICs in a specific metasurface design.
- To analyze the role of magnetic toroidal dipole (MTD) modes and asymmetry in sensing performance.
Main Methods:
- Fabrication of periodic rectangular amorphous silicon pillars on a quartz substrate.
- Excitation of quasi-BICs by breaking symmetry within the unit cell.
- Analysis of resonant modes using near-field distribution and multipole decomposition.
- Investigation of sensing performance through transmission spectrum measurements and perturbation theory.
Main Results:
- Achieved a high sensitivity of 413 RIU⁻¹ for the metasurface sensor.
- Demonstrated a high figure of merit (FOM) of 66 RIU⁻¹.
- Confirmed the dominant role of magnetic toroidal dipole (MTD) resonance in the quasi-BIC excitation.
- Showcased the significant impact of asymmetry on sensing performance.
Conclusions:
- The proposed amorphous silicon metasurface sensor effectively utilizes quasi-BICs for ultrasensitive detection.
- Strong MTD resonance quasi-BICs are achievable in dielectric metasurfaces for advanced sensing.
- The developed sensor exhibits excellent prospects for various sensing applications requiring high sensitivity and FOM.
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