A graphene perfect absorber with tunable, dual band, high sensitivity characteristics

Wu, Pinghui; Zeng, Xintao; Su, Ning; Chen, Musheng; Zeng, Yongxi; Yu, Yanzhong

doi:10.1016/j.diamond.2022.109002

Cited by 10 publications

(3 citation statements)

References 67 publications

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“…Conversely, at higher frequencies, it is advisable to avoid an excessively thick silicon dioxide layer. This rule can be found in reference [ 51 ]. The graphene layer and the gold layer form an asymmetric Fabry–Perot cavity.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Design of a Penta-Band Graphene-Based Terahertz Metamaterial Absorber with Fine Sensing Performance

Lai,

Chen,

Zhou

et al. 2023

Micromachines

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This paper presents a new theoretical proposal for a surface plasmon resonance (SPR) terahertz metamaterial absorber with five narrow absorption peaks. The overall structure comprises a sandwich stack consisting of a gold bottom layer, a silica medium, and a single-layer patterned graphene array on top. COMSOL simulation represents that the five absorption peaks under TE polarization are at fI = 1.99 THz (95.82%), fⅡ = 6.00 THz (98.47%), fⅢ = 7.37 THz (98.72%), fⅣ = 8.47 THz (99.87%), and fV = 9.38 THz (97.20%), respectively, which is almost consistent with the absorption performance under TM polarization. In contrast to noble metal absorbers, its absorption rates and resonance frequencies can be dynamically regulated by controlling the Fermi level and relaxation time of graphene. In addition, the device can maintain high absorptivity at 0~50° in TE polarization and 0~40° in TM polarization. The maximum refractive index sensitivity can reach SV = 1.75 THz/RIU, and the maximum figure of merit (FOM) can reach FOMV = 12.774 RIU−1. In conclusion, our design has the properties of dynamic tunability, polarization independence, wide-incident-angle absorption, and fine refractive index sensitivity. We believe that the device has potential applications in photodetectors, active optoelectronic devices, sensors, and other related fields.

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Section: Simulation Results and Discussionmentioning

confidence: 99%

Design of a Penta-Band Graphene-Based Terahertz Metamaterial Absorber with Fine Sensing Performance

Lai,

Chen,

Zhou

et al. 2023

Micromachines

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show abstract

“…The absorber achieves perfect absorption by using a layer of Silicon Dioxide (SiO 2 ), which captures a higher amount of light energy which leads to ohmic loss. 32 The effect of geometrical parameters on absorptance and resonance frequency was studied. From figure Fig.…”

Section: Methodsmentioning

confidence: 99%

“…31 Various structures have been used in the literature to obtain perfect absorption but Split ring resonators (SRRs) have been proven to be the best type of metasurfaces for achieving perfect absorption. 25,[31][32][33][34] Earlier most of the nanostructure was created with the help of noble metals like silver and gold. The work presented by Cheng et al 35 describes a micro-ring-shaped GaAs (gallium arsenide) array-based terahertz narrowband perfect metasurface absorber.…”

mentioning

confidence: 99%

Terahertz Metamaterial Absorber Based on Graphene with Properties Optimised by Investigation of Plasma Parameters for Improved Device Performance

Bhatia,

Ramachandra,

Anirudh

et al. 2023

ECS J. Solid State Sci. Technol.

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Low-dimensional materials like graphene have tremendous potential for use in high-performance terahertz absorbers for a variety of practical applications. Direct growth techniques, such as plasma-enhanced chemical vapor deposition (PECVD), that offer control over the inherent features of those materials can further lead to affordable and scalable ways to construct effective absorber devices. Because it has a high degree of electromagnetic confinement in the terahertz range and tunability, graphene is an especially alluring plasmonic material. This study presents a terahertz absorber optimized by tailoring the electrical and physical characteristics of graphene sheets for use as a metamaterial. A correlation between device performance and plasma parameters in graphene growth has been found because parameters like thickness, carrier mobility, and carrier density of graphene sheets can be controlled during their growth during PECVD, which in turn can have a significant impact on the material's frequency-dependent complex conductivity. To build the ideal device, data from PECVD experiments have been thoroughly assimilated and utilized in device simulation to the maximum possible extent. The terahertz absorber uses a simplified and optimized rectangular ring resonator geometry and achieves single-band and narrow absorption of 100% upon using graphene with particular values of thickness, carrier density, and carrier mobility.

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Dynamically tunable single-/dual-band of the graphene absorber with a resonant asymmetric grating based on lithium niobate on insulator

Sun

et al. 2023

Optics Communications

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A graphene perfect absorber with tunable, dual band, high sensitivity characteristics

Cited by 10 publications

References 67 publications

Design of a Penta-Band Graphene-Based Terahertz Metamaterial Absorber with Fine Sensing Performance

Design of a Penta-Band Graphene-Based Terahertz Metamaterial Absorber with Fine Sensing Performance

Terahertz Metamaterial Absorber Based on Graphene with Properties Optimised by Investigation of Plasma Parameters for Improved Device Performance

Dynamically tunable single-/dual-band of the graphene absorber with a resonant asymmetric grating based on lithium niobate on insulator

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