High-Performance Quality Factor Based Sensor With Diagonal Cylinder Metasurface of the Bound State in the Continuum

High-quality-factor (high- Q -factor) electromagnetic resonance plays an important role in sensor applications. Previously proposed gas refractive index sensors are often limited by the large cavity length or microscale fabrication process in practical applications. Recently, ultra-high Q factor res...

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Bibliographic Details
Published in:Photonic sensors (Berlin) 2023-06, Vol.13 (2), p.230232-10, Article 230232
Main Authors: Chen, Yuxuan, Li, Yuke, Hu, Zhengda, Wang, Zexiang, Li, Zhenxing, Wang, Jicheng
Format: Article
Language:English
Subjects:
bound state in the continuum
Cylinders
Dipoles
Far fields
Lasers
Measurement Science and Instrumentation
Metasurfaces
Microwaves
Multipoles
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Q factors
Refractivity
Regular
Resonance
RF and Optical Engineering
Sensors
toroidal dipole
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Summary:High-quality-factor (high- Q -factor) electromagnetic resonance plays an important role in sensor applications. Previously proposed gas refractive index sensors are often limited by the large cavity length or microscale fabrication process in practical applications. Recently, ultra-high Q factor resonance based on the bound state in the continuum (BIC) has provided a feasible approach to solve these problems. In this paper, we propose a metasurface structure consisting of a single size tetramer cylinder. It supports dual band toroidal dipole (TD) resonances driven by BIC. The physical mechanism of double TD resonances is clarified by the multipole decomposition of the metasurface band structure and far-field scattering power. The sensor structure based on this achieves a sensitivity of 518.3 MHz/RIU, and the maximum line width does not exceed 680 kHz. The high- Q -factor electromagnetic resonance has the advantages of polarization independence and simplicity to manufacture. These findings will open up an avenue to develop the ultrasensitive sensor in the gigahertz regime.
ISSN:1674-9251
2190-7439
DOI:10.1007/s13320-022-0673-6