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

Zhao, Jianlin; Wang, Jiaxian; Gao, Li-Zhen; Qiu, Weibin

doi:10.3390/nano13030505

Cited by 19 publications

(8 citation statements)

References 52 publications

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“…The red solid circles represent the coupled (or hybrid) mode based on the indirect coupling between GMR 1st and BIC 2nd , and they are obtained by fitting Fano formula to the reflection spectra of Figure 2a. The transmission in the Fano formula can be described as follows [56][57][58][59][60]:…”

Section: Validation Of the One-port Resonant System Mimickingmentioning

confidence: 99%

Perfect Absorption and Reflection Modulation Based on Asymmetric Slot-Assisted Gratings without Mirrors

Lee,

Kim

2023

Nanomaterials

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As a perfect graphene absorber without any external mirrors, we proposed asymmetric slot-assisted grating structures supporting two degenerate resonant modes of the guided-mode resonances (GMR) and the quasi-bound states in the continuum (quasi-BIC). The GMR mode functions as an internal mirror in conjunction with the background scattering, while the quasi-BIC, which is responsible for perfect graphene absorption, stems from the horizontal symmetry breaking by an asymmetric slot. By properly shifting the slot center from the grating center, the leakage rate of quasi-BIC can be controlled in such a way as to satisfy the critical coupling condition. We provide a comprehensive study on the coupling mechanism of two degenerate resonant modes for a one-port system mimicking the resonance. We also numerically demonstrated that our proposed grating structures show an excellent reflection-type modulation performance at optical wavelength ranges when doped double-layer graphene is applied. Due to the perfect absorption at the OFF state, a high modulation depth of ~50 dB can be achieved via a small Fermi level variation of ~0.05 eV. To obtain the lower insertion loss at the ON state, the higher Fermi level is required to decrease the graphene absorption coefficient.

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Section: Validation Of the One-port Resonant System Mimickingmentioning

confidence: 99%

Perfect Absorption and Reflection Modulation Based on Asymmetric Slot-Assisted Gratings without Mirrors

Lee,

Kim

2023

Nanomaterials

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“…17 TMDs can be integrated into photonic structures such as plasmonic antennas, metasurfaces, and photonic crystals to achieve enhanced emission despite their low quantum yield and short light-matter-interaction length. [18][19][20][21][22][23][24][25] Hydrogenated amorphous silicon (a-Si:H) is extensively used for the fabrication of metasurfaces in wavelengths ranging from 660 nm to 1100 nm. Although many theoretical studies predicted high enhancement factors and exciton-polariton formation, [11][12][13][14] there are only a few experimental studies, where the quasi-BIC resonance of Si metasurface has been shown to produce emission enhancement in the visible wavelength.…”

Section: Introductionmentioning

confidence: 99%

Quasi-BIC resonance in TiO2 metasurface for emission enhancement of two-dimensional material

Kuppadakkath,

Barreda,

Yang

et al. 2024

Photonic and Phononic Properties of Engineered Nanostructures XIV

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Bound states in the continuum (BICs) are a category of localized states that exist within the continuum of radiating modes. The high Q-factor exhibited by these states makes quasi-BICs interesting for enhancing the emission from quantum emitters. Quasi-BICs have been experimentally realized in silicon for applications in the infrared wavelength range. Instead of silicon, hydrogenated amorphous silicon (a-Si:H) has been used for achieving quasi-BIC resonance in parts of visible spectra. Titanium dioxide (TiO 2 ) has emerged as an alternate material for fabricating dielectric metasurfaces with high Q-factor in the visible spectral range due to its lower absorptive losses and high refractive index. However, the fabrication process for TiO 2 nanostructures presents challenges compared to the well-established fabrication processes in silicon. Our work focuses on the design and fabrication of TiO 2 metasurfaces supporting a quasi-BIC mode around 795 nm, with a theoretical Q-factor of 353. Experimental results reveal a maximum Q-factor of 258 at 791 nm. We discuss encountered fabrication constraints and explore possibilities for improvement in both design and fabrication processes. This study contributes to the understanding of quasi-BIC resonance in TiO 2 metasurfaces, and opens avenues for further exploration in the utilization of TiO 2 for high-Q dielectric metasurfaces, offering i nsights i nto t he d esign and optimization of these structures.

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“…This mode allows electromagnetic wave energy to reside in the continuum for a long period of time [14]. The Q-BIC mode is easily recognized in the electromagnetic spectrum due to its Fano resonance characteristic with finite linewidth [15][16][17]. As for the methods for generating Q-BIC modes, there are two main approaches: periodic structure design and asymmetric structure design.…”

Section: Introductionmentioning

confidence: 99%

Absorption modulation of quasi-BIC in Si–VO₂ composite metasurface at near-infrared wavelength

Dai,

Liu,

et al. 2023

New J. Phys.

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Bound states in the continuum (BIC) have attracted great attention in nanophotonics in the past few years. The metasurface with inverted symmetry breaking exhibits high Q resonance through quasi-BIC (Q-BIC), which realizes light modulation, sensing and nonlinear generation. In this work, a symmetry-broken Si–VO2 composite metasurface is studied and modulate near-infrared light absorption in Q-BIC mode. First, a L-shaped Si metasurface with broken C4v symmetry is designed, which realizes the transition from BIC to Q-BIC and shows strong circular dichroism. Later, phase-change material VO2 is integrated into the L-shaped Si metasurface. By changing the ambient temperature, the Si–VO2 composite metasurface shows distinct light absorption characteristics, including insensitivity to incident angle and a maximum absorption modulation of up to 210%. The results show that VO2 can effectively modified Q-BIC resonator to realize the modulation absorption of near-infrared light.

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

Cited by 19 publications

References 52 publications

Perfect Absorption and Reflection Modulation Based on Asymmetric Slot-Assisted Gratings without Mirrors

Perfect Absorption and Reflection Modulation Based on Asymmetric Slot-Assisted Gratings without Mirrors

Quasi-BIC resonance in TiO2 metasurface for emission enhancement of two-dimensional material

Absorption modulation of quasi-BIC in Si–VO₂ composite metasurface at near-infrared wavelength

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

Cited by 19 publications

References 52 publications

Perfect Absorption and Reflection Modulation Based on Asymmetric Slot-Assisted Gratings without Mirrors

Perfect Absorption and Reflection Modulation Based on Asymmetric Slot-Assisted Gratings without Mirrors

Quasi-BIC resonance in TiO2 metasurface for emission enhancement of two-dimensional material

Absorption modulation of quasi-BIC in Si–VO2 composite metasurface at near-infrared wavelength

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Product

Resources

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Absorption modulation of quasi-BIC in Si–VO₂ composite metasurface at near-infrared wavelength