High-Sensitivity Sensor Based on Diametrical Graphene Strip Plasma-Induced Transparency

Zhu, Aijun; Bu, Pengcheng; Liu, Cheng; Hu, Cong; Mahapatra, Rabi

doi:10.3390/photonics10070830

Cited by 11 publications

(4 citation statements)

References 53 publications

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“…In order to better study the absorption of this absorber, it is first necessary to characterize the optical response of graphene. Since graphene is a two-dimensional material, according to the Kubo formula [38][39][40], the surface conductivity of graphene can be described as follows:…”

Section: Structure and Theorymentioning

confidence: 99%

High-Q Multiband Narrowband Absorbers Based on Two-Dimensional Graphene Metamaterials

Zhu,

Bu,

Cheng

et al. 2024

Photonics

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In this paper, an absorber with multi-band, tunable, high Q, and high sensitivity, based on terahertz periodic two-dimensional patterned graphene surface plasmon resonance (SPR), is proposed. The absorber consists of a bottom metal film separated by a periodically patterned graphene metamaterial structure and a SiO2 dielectric layer, where the patterned graphene layer is etched by “+” and “L” shapes and circles. It has simple structural features that can greatly simplify the fabrication process. We have analyzed the optical properties of a graphene surface plasmon perfect metamaterial absorber based on graphene in the terahertz region using the finite-difference method in time domain (FDTD). The results show that the absorber device exhibits three perfect absorption peaks in the terahertz bands of f1 = 1.55 THz, f2 = 4.19 THz, and f3 = 6.92 THz, with absorption rates as high as 98.70%, 99.63%, and 99.42%, respectively. By discussing the effects of parameters such as the geometrical dimensions of patterned graphene metamaterial structure “+” width W1, “L” width W2, circular width R, and the thickness of the dielectric layer on the absorption performance of absorber, as well as investigating the chemical potential and relaxation time of patterned-layer graphene material, it was found that the amplitude of the absorption peaks and the frequency of resonance of absorber devices can be dynamically adjusted. Finally, we simulated the spectra as the surrounding refractive index n varied to better evaluate the sensing performance of the structure, yielding structural sensitivities up to 382 GHz/RIU. Based on this study, we find that the results of our research will open new doors for the use of multi-band, tunable, polarization-independent metamaterial absorbers that are insensitive to large-angle oblique incidence.

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Section: Structure and Theorymentioning

confidence: 99%

High-Q Multiband Narrowband Absorbers Based on Two-Dimensional Graphene Metamaterials

Zhu,

Bu,

Cheng

et al. 2024

Photonics

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“…The first involves a weak coupling between bright modes at the resonant frequency, which generates a transparent window in the transmission spectrum. [8]. The second mechanism relies on destructive interference between the bright and dark modes to produce a transparent window at a specific frequency [9].…”

Section: Introductionmentioning

confidence: 99%

Multifunctional terahertz device based on plasmon-induced transparency

Lei,

Nie,

et al. 2024

Phys. Scr.

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Enhancing light-matter interaction is crucial in optics for boosting nanophotonic device performance, which can be achieved via plasmon-induced transparency (PIT). In this study, a polarization-insensitive PIT effect at terahertz frequencies is achieved using a novel metasurface composed of a cross-shaped graphene structure surrounded by four graphene strips. The high symmetry of this metasurface ensures its insensitivity to changes in the polarization angle of incident light. The PIT effect, stemming from the coupling of graphene bright modes, was explored through finite difference time domain (FDTD) simulations and coupled mode theory (CMT) analysis. By tuning the Fermi level in graphene, we effectively modulated the PIT transparent window, achieving high-performance optical switching with a modulation depth (88.9% < MD < 98.0%) and insertion losses (0.17 dB < IL < 0.51 dB) at a carrier mobility of 2 m2/(V·s). Furthermore, the impact of graphene carrier mobility on the slow-light effect was examined, revealing that increasing the carrier mobility from 0.5 m2/(V·s) to 3 m2/(V·s) boosts the group index from 126 to 781. These findings highlight the potential for developing versatile terahertz devices, such as optical switches and slow-light apparatus.

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“…provides new opportunities for development of optical devices such as high-sensitivity sensors [22][23][24], and optical modulators and switches [25]. Furthermore, recent reports have revealed a strong connection between the TD resonance and the BICs, allowing high Q and a strong electromagnetic field enhancement.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum

Ji,

Lv,

Yang

et al. 2023

Preprint

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An all-dielectric metasurface composed of orthogonal-slit silicon disks is proposed in this study. By modifying the unit structure of the metasurface with the bound states in the continuum (BIC) theory, a sharp Fano resonance can be generated. The resonance properties of the metasurface are investigated by analyzing the effects of the structural parameters on the resonance using the eigenmode analysis method. The Q factor and the resonance wavelength can be adjusted by varying the slit width, the disk thickness, and the disk radius. The electromagnetic characteristics and mechanism of the toroidal dipole-BIC (TD-BIC) are explored in depth through an analysis of the multipole expansion of the scattered power, along with the electromagnetic field and the current distribution at resonance. This research provides a novel approach for excitation of a strong TD-BIC resonance and proposes potential applications in optical switches, high-sensitivity optical sensors, and related areas.

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High-Sensitivity Sensor Based on Diametrical Graphene Strip Plasma-Induced Transparency

Cited by 11 publications

References 53 publications

High-Q Multiband Narrowband Absorbers Based on Two-Dimensional Graphene Metamaterials

High-Q Multiband Narrowband Absorbers Based on Two-Dimensional Graphene Metamaterials

Multifunctional terahertz device based on plasmon-induced transparency

Asymmetric Orthogonal Metasurfaces Governed by Toroidal Dipole Bound States in the Continuum

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