High-Q Fano Terahertz resonance based on bound states in the continuum in All-dielectric metasurface

Cen, Wenyang; Lang, Tingting; Wang, Jinfeng; Xiao, Meiyu

doi:10.1016/j.apsusc.2021.151723

Cited by 50 publications

(18 citation statements)

References 73 publications

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“…Although the FOM in Ref. [28] is very high, the structure is based on lossless silicon and high-order resonant frequency.…”

Section: Resultsmentioning

confidence: 99%

“…High Q is often accompanied by a strong field enhancement. Therefore, there has been much research on Fano resonance based on BIC to improve the sensitivity of refractive indices [25][26][27][28] . However, the field enhancement is not proportional to the Q factor due to material dissipation [29] .…”

Section: Introductionmentioning

confidence: 99%

“…However, the field enhancement is not proportional to the Q factor due to material dissipation [29] . Most of the research based on BIC is to achieve a refractive index sensing by obtaining a high Q factor [25,26,28] . Therefore, although the structure with the high Q factor can obtain high FOM, it cannot obtain the strongest local field enhancement [20] , which limits the high sensitivity.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Fano resonance for high-sensitivity sensing based on bound states in the continuum

et al. 2023

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Although previously reported terahertz absorbers can achieve high-sensitivity refractive index sensing, the resonant peak is too broad, which leads to a low figure of merit (FOM). Transmissive sensors based on bound states in the continuum (BIC) can achieve high FOM, but they have some limitations in high sensitivity. Herein, we propose a periodic triple parallel metal bars structure to obtain high quality, a strong field, and multiple hot spots by the Friedrich-Wintgen BIC. Numerical results show the sensitivity and FOM can reach 1877 GHz/RIU and 665, respectively. Compared to the previously reported transmissive sensors based on BIC, the sensitivity has been greatly improved.

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“…Although the FOM in Ref. [28] is very high, the structure is based on lossless silicon and high-order resonant frequency.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Fano resonance for high-sensitivity sensing based on bound states in the continuum

et al. 2023

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“…Compared with three-dimensional (3-D) structures, photonic crystals, or metal resonators, dielectric supersurfaces with high Q-factor have advantages in terms of flexibility, size, and nonlinear optical compatibility [ 8 , 9 , 10 ]. The all-dielectric metasurface supports Mie resonance and can provide high Q-factor and FOM (Figure of Merit), and is more compatible with complementary metal oxide semiconductor production processes [ 10 , 11 , 12 ]. Therefore, all-dielectric metasurface-based sensors exhibit stronger light-harvesting capabilities and smaller volumes, enabling label-free, on-chip integration, and ultrasensitive sensing, which become current research hotspots.…”

Section: Introductionmentioning

confidence: 99%

High-Sensitivity Sensing in All-Dielectric Metasurface Driven by Quasi-Bound States in the Continuum

et al. 2023

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Quasi-bound states in the continuum (quasi-BIC) in all-dielectric metasurfaces provide a crucial platform for sensing due to its ability to enhance strong matter interactions between light-waves and analytes. In this study, a novel high-sensitivity all-dielectric sensor composed of a periodic array of silicon (Si) plates with square nanoholes in the continuous near-infrared band is theoretically proposed. By adjusting the position of the square nanohole, the symmetry-protected BIC and Friedrich–Wintgen BIC (FW–BIC) can be excited. The torodial dipole (TD) and electric quadruple (EQ) are demonstrated to play a dominating role in the resonant modes by near-field analysis and multipole decomposition. The results show that the sensitivity, the Q-factor, and the corresponding figure of merit (FOM) can simultaneously reach 399 nm/RIU (RIU is refractive index unit), 4959, and 1281, respectively. Compared with other complex nanostructures, the proposed metasurface is more feasible and practical, which may open up an avenue for the development of ultrasensitive sensors.

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“…In 2019, He et al proposed the Si-ADMS structure, utilizing the asymmetry of the structure to achieve a quality factor exceeding 60 [29]. In proposed an all-dielectric columnar structure with asymmetry [30], which also achieved Fano resonance with a very high Q-factor. Although all-dielectric materials avoid the loss caused by metal materials, asymmetric structure will cause polarization dependence (i.e., inconsistent spectral results in TE and TM directions) which hinders the further improvement of sensitivity and increases the difficulty of measurement.…”

Section: Introductionmentioning

confidence: 99%

Polarization-Independent Multi-Resonance With High Q-Factor for Highly Sensitive Terahertz Sensors Based on All-Dielectric Metasurface

Zhang

Yang

et al. 2022

IEEE Photonics J.

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Since the fingerprints of numerous crucial biologic materials can be identified by terahertz (THz) spectroscopy, THz sensing have become an important approach of biological and medical detections. Particularly, benefit from the excellent capability of metasurface, strong interactions between the metasurface and THz waves can be realized, thus the THz sensing with high sensitivity becomes reality. However, the common configuration of metasurface-based THz sensor is composed of metallic subwavelength structure. Due to the inherent resistive loss of metal, it is still a great challenge to further enhance the quality factor (Q-factor) of resonance and sensitivity of THz sensor. In this work, we designed an all-dielectric metasurface with high Q-factor for highly sensitive THz sensors. The metasurface is a windmilllike structure consisting of four cuboids, and every adjacent two cuboids are arranged alternately vertically and horizontally. The transmission spectrum of metasurface exhibits four polarizationindependent and strong resonance peaks with high Q-factor in 0.1-2.5THz, and all of them show high sensitivity related to ambient refractive index. The transmitted structure and polarizationindependent resonances can relief the difficulty of measurement. We believe these studies will lay the theoretical and technical foundation for the design of high-sensitivity terahertz sensing.

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High-Q Fano Terahertz resonance based on bound states in the continuum in All-dielectric metasurface

Cited by 50 publications

References 73 publications

Enhanced Fano resonance for high-sensitivity sensing based on bound states in the continuum

Enhanced Fano resonance for high-sensitivity sensing based on bound states in the continuum

High-Sensitivity Sensing in All-Dielectric Metasurface Driven by Quasi-Bound States in the Continuum

Polarization-Independent Multi-Resonance With High Q-Factor for Highly Sensitive Terahertz Sensors Based on All-Dielectric Metasurface

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