Photonic spin-selective perfect absorptance on planar metasurfaces driven by chiral quasi-bound states in the continuum

Li, Hong-Ju; Zhou, Hongmiao; Wei, Gangao; Xu, Hangsheng; Qin, Meng; Liu, Jianqiang; Wu, Feng

doi:10.1039/d3nr00055a

Cited by 29 publications

(8 citation statements)

References 78 publications

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“…A metasurface is a two-dimensional surface composed of artificially designed micro-nanostructures [32,33], and its lattice structure is a square. Through precise design of its micro-nanostructures, a metasurface achieves highly controlled manipulation of incident light waves.…”

Section: Structure and Theoretical Modelmentioning

confidence: 99%

Terahertz refractive index sensor based on dual plasmon-induced transparency in a graphene metasurface

Yang,

Xu,

et al. 2024

Phys. Scr.

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A novel graphene metasurface is proposed in this article, which is simulated by the finite difference time domain (FDTD) and found to exhibit a significant dual Plasmon-induced transparency (PIT) phenomenon in the terahertz frequency band. For further research, new transmission spectra are simulated using the coupled mode theory (CMT), and after comparison, it is found that the images were basically consistent and had a high degree of agreement. In addition, through observation and analysis of the PIT window, it is found that the PIT phenomenon can be effectively tuned by adjusting the Fermi level. Finally, the metasurface is proposed in this article, which has excellent sensing properties. After calculation and comparison of different refractive indices of surrounding media, it is found that the maximum sensitivity can reach 1.567 THz/RIU at a frequency of f = 4.8716 THz, with a figure of merit (FOM) of 23.855. Compared with other sensors of the same type, the sensor in this paper has great advantages. In summary, the graphene metasurface proposed in this article provides more theoretical support for manufacturing dynamically adjustable graphene sensors.

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Section: Structure and Theoretical Modelmentioning

confidence: 99%

Terahertz refractive index sensor based on dual plasmon-induced transparency in a graphene metasurface

Yang,

Xu,

et al. 2024

Phys. Scr.

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“…Because a copper plate is selected as the bottom layer of the radar absorber, electromagnetic waves cannot penetrate it. Consequently, the studied radar absorber can be considered as a single-port system without the transmission channel [47]. According to the transmission line theory (TLT), when an incident wave is perpendicular to the radar absorber, its reflection coefficient can be mathematically expressed as formula (1) [22].…”

Section: Theoretical Derivation and Analysis Of The Reflectivitymentioning

confidence: 99%

Design of a wideband and tunable radar absorber

Gao,

Dou,

Peng

et al. 2023

Mater. Res. Express

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To effectively address the challenges posed by intricate and dynamic electromagnetic environments, we propose a wideband and tunable radar absorber in this paper. The proposed absorber, composed of graphene capacitor, plasma enclosed within a sealed glass cavity, radar absorbing material (RAM), FR-4 and copper plate, allows for tunable radar absorbing performance through the manipulation of the electromagnetic properties of the graphene capacitor and plasma. Based on the equivalent circuit model, the reflectivity of the radar absorber is analyzed using transmission line theory (TLT). Good agreement is observed between the full-wave simulations and the TLT. The study thoroughly investigates the influence of graphene, plasma, and RAM components, as well as their sequential arrangement within the radar absorber, on its reflectivity, expounding the fundamental mechanism of these materials' synergistic integration. Additionally, the effects of key factors, including the surface resistance R_g of graphene, plasma frequency w_p, collision frequency v_p and plasma thickness t_plasma, on the radar absorbing performance are examined. Our findings reveal that adjusting surface resistance R_g controls the absorbing amplitude, and manipulation of the plasma frequency and collision frequency tunes the absorbing frequency and effective absorbing band. By appropriately adjusting the surface resistance R_g of graphene, plasma frequency w_p and collision frequency v_p, the proposed radar absorber exhibits superior performance in the frequency range of 1GHz to 10GHz. The radar absorber we propose serves as a significant reference for the application of tunable radar absorbers and adaptive radar stealth techniques.

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“…In recent times, several chiral nanostructures have been proposed by researchers to explore the mechanisms behind the circular dichroism (CD) effect and obtain strong CD signals. The single-layer chiral nanostructures have received extensive attention from researchers due to their simple structure, requiring only one etching process. − For instance, the all-silicon chiral nanostructures based on the far-field interference effect exhibit a maximum CD parameter value of 0.46 in the THz waveband, greater than the 0.3 bandwidth of approximately 0.27 THz . The double-layer chiral nanostructures, which can generate interlayer coupling, have been shown to enhance CD further. − For example, the vanadium dioxide-based double-layer gold arc chiral nanostructure displays a maximum circular dichroic response value of 0.7 in the near-infrared waveband .…”

Section: Introductionmentioning

confidence: 99%

Active Control and Sensing Application of Ultra-Narrowband Circular Dichroism in Multilayer Chiral Nanorod Arrays

Wang,

Peng,

Sun

et al. 2023

ACS Appl. Mater. Interfaces

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Narrowband circular dichroism (CD) has attracted wide attention for its high sensitivity in detecting chiral molecules and catalysis. However, designing a chiral metasurface with excellent sensing performance that can be dynamically tuned still poses challenges. This paper introduces lithium niobate, an electrically tunable material, and a distributed Bragg reflector into chiral nanorod structures to form multilayer chiral nanorod arrays (MCNAs). Simulation results show that MCNAs can generate four strong ultra-narrowband (UNB) CD signals in the visible light spectrum. The UNB CD signal intensity was up to 0.86, and the minimum full width at half-maximum (FWHM) was up to 0.21 nm. The surface electric field and current distribution of MCNAs indicate that the four UNB CD signals mainly originate from the x and y direction Tamm resonances in the chiral nanorod layer. The refractive index of lithium niobate can be tuned by changing the electric field, allowing the active tuning of UNB CD signals. In addition, the sensing performance of MCNAs in the SARS-CoV-2 solution was analyzed, and the figure of merit (FOM) can reach an astonishing 2092. These findings not only assist with the design of UNB chiral devices but also offer new possibilities for the environmental monitoring and ultrasensitive detection of chiral molecules.

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Photonic spin-selective perfect absorptance on planar metasurfaces driven by chiral quasi-bound states in the continuum

Abstract: Optical metasurfaces with high-quality-factor resonances and selective chirality simultaneously are desired for nanophotonics. Here, an all-dielectric planar chiral metasurface is theoretically proposed and numerically proved to support the astonishing symmetry-protected...

Cited by 29 publications

References 78 publications

Terahertz refractive index sensor based on dual plasmon-induced transparency in a graphene metasurface

Terahertz refractive index sensor based on dual plasmon-induced transparency in a graphene metasurface

Design of a wideband and tunable radar absorber

Active Control and Sensing Application of Ultra-Narrowband Circular Dichroism in Multilayer Chiral Nanorod Arrays

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