Active tunable terahertz bandwidth absorber based on single layer graphene

Communications in Theoretical Physics, Journal Year: 2023, Volume and Issue: 75(4), P. 045503 - 045503

Published: Feb. 23, 2023

Abstract In this paper, an active tunable terahertz bandwidth absorber based on single-layer graphene is proposed, which consists of a layer, photo crystal plate, and gold substrate. When the Fermi energy ( E f ) 1.5 eV, shows high absorption in range 3.7 THz–8 THz, total rate 96.8%. By exploring mechanism absorber, excellent physical regulation. The also good adjustability by changing graphene. This means that exhibits tunability adjusting parameters absorber. Meanwhile, polarization independent insensitive to incident angle. fine characteristics mean has superior application value many fields such as biotechnology space exploration.

Language: Английский

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Ultra long infrared metamaterial absorber with high absorption and broad band based on nano cross surrounding

Optics & Laser Technology, Journal Year: 2022, Volume and Issue: 158, P. 108789 - 108789

Published: Oct. 24, 2022

Language: Английский

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Polarization independent tunable bandwidth absorber based on single-layer graphene

Diamond and Related Materials, Journal Year: 2024, Volume and Issue: 142, P. 110793 - 110793

Published: Jan. 8, 2024

Language: Английский

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Triple-Band Surface Plasmon Resonance Metamaterial Absorber Based on Open-Ended Prohibited Sign Type Monolayer Graphene

Micromachines, Journal Year: 2023, Volume and Issue: 14(5), P. 953 - 953

Published: April 27, 2023

This paper introduces a novel metamaterial absorber based on surface plasmon resonance (SPR). The is capable of triple-mode perfect absorption, polarization independence, incident angle insensitivity, tunability, high sensitivity, and figure merit (FOM). structure the consists sandwiched stack: top layer single-layer graphene array with an open-ended prohibited sign type (OPST) pattern, middle thicker SiO2, bottom gold metal mirror (Au). simulation COMSOL software suggests it achieves absorption at frequencies fI = 4.04 THz, fII 6.76 fIII 9.40 peaks 99.404%, 99.353%, 99.146%, respectively. These three resonant corresponding rates can be regulated by controlling patterned graphene's geometric parameters or just adjusting Fermi level (EF). Additionally, when changes between 0~50°, still reach 99% regardless kind polarization. Finally, to test its refractive index sensing performance, this calculates results under different environments which demonstrate maximum sensitivities in modes: SI 0.875 THz/RIU, SII 1.250 SIII 2.000 THz/RIU. FOM FOMI 3.74 RIU-1, FOMII 6.08 FOMIII 9.58 RIU-1. In conclusion, we provide new approach for designing tunable multi-band SPR potential applications photodetectors, active optoelectronic devices, chemical sensors.

Language: Английский

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Numerical simulation of efficient solar absorbers and thermal emitters based on multilayer nanodisk arrays

Applied Thermal Engineering, Journal Year: 2023, Volume and Issue: 230, P. 120841 - 120841

Published: May 24, 2023

Language: Английский

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Ultra wideband absorption absorber based on Dirac semimetallic and graphene metamaterials

Physics Letters A, Journal Year: 2024, Volume and Issue: 517, P. 129675 - 129675

Published: June 22, 2024

Language: Английский

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High sensitivity five band tunable metamaterial absorption device based on block like Dirac semimetals

Optics Communications, Journal Year: 2024, Volume and Issue: 569, P. 130816 - 130816

Published: June 24, 2024

Language: Английский

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Ultra-Broadband Solar Absorber and High-Efficiency Thermal Emitter from UV to Mid-Infrared Spectrum

Micromachines, Journal Year: 2023, Volume and Issue: 14(5), P. 985 - 985

Published: April 30, 2023

Solar energy is currently a very popular source because it both clean and renewable. As result, one of the main areas research now investigation solar absorbers with broad spectrum high absorption efficiency. In this study, we create an absorber by superimposing three periodic Ti-Al2O3-Ti discs on W-Ti-Al2O3 composite film structure. We evaluated incident angle, structural components, electromagnetic field distribution using finite difference in time domain (FDTD) method order to investigate physical process which model achieves broadband absorption. find that distinct wavelengths tuned or resonant may be produced Ti disk array Al2O3 through near-field coupling, cavity-mode plasmon resonance, all can effectively widen bandwidth. The findings indicate absorber’s average efficiency range from 95.8% 96% over entire band 200 3100 nm, bandwidth 2811 nm (244–3055 nm) having highest rate. Additionally, only contains tungsten (W), titanium (Ti), alumina (Al2O3), materials melting points, offers strong assurance for thermal stability. It also has radiation intensity, reaching 94.4% at 1000 K, weighted 98.3% AM1.5. incidence angle insensitivity our suggested good (0–60°) polarization independence (0–90°). These benefits enable wide photovoltaic applications offer numerous design options ideal absorber.

Language: Английский

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Graphene Multi-Frequency Broadband and Ultra-Broadband Terahertz Absorber Based on Surface Plasmon Resonance

Electronics, Journal Year: 2023, Volume and Issue: 12(12), P. 2655 - 2655

Published: June 13, 2023

When surface plasmon resonance (SPR) occurs, the incident light is absorbed by of SPR structure, thus minimizing intensity reflected light. Therefore, method adopted in this paper to achieve perfect absorption absorbent. In paper, we first propose a multi-frequency broadband absorber structure based on graphene SPR, which uses continuous patterned frequency spectrum form absorption. simulation, sandwich-stack was adopted, whereby situated top SiO2 layer and metal layer. The broad-band bands were obtained as 4.14–4.38 THz, 5.78–6.36 7.87–8.66 THz through analog simulation finite-difference time-domain (FDTD) solutions. Then, multi-layer resonant unit superposition combination absorbing units responding different bands, ultra-wideband achieved. data results illustrate that total bandwidth 2.26 relative Bw equal 28.93%. electric field X-Y direction band analyzed, respectively, dynamic tunability studied. Finally, studied whether still has efficient characteristics for two polarization modes when angle changed from 0° 70°. model proposed potential value application terahertz photoelectric detection, filtering, electromagnetic shielding.

Language: Английский

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Multi-functional metasurface: ultra-wideband/multi-band absorption switching by adjusting guided-mode resonance and local surface plasmon resonance effects

Communications in Theoretical Physics, Journal Year: 2024, Volume and Issue: 76(6), P. 065701 - 065701

Published: April 7, 2024

Abstract This study introduces an innovative dual-tunable absorption film with the capability to switch between ultra-wideband and narrowband absorption. By manipulating temperature, can achieve multi-band within 30–45 THz range or spanning 30–130 THz, rate exceeding 0.9. Furthermore, structural parameters of are optimized using particle swarm optimization (PSO) algorithm ensure optimal response. The response is primarily attributed coupling guided-mode resonance local surface plasmon effects. film’s symmetric structure enables polarization incoherence allows for tuning through various means such as doping/voltage, temperature parameters. In case a response, exhibits good sensitivity refractive index changes in multiple modes. Additionally, spectrum remains effective even at large incidence angles, making it highly promising applications fields biosensing infrared stealth.

Language: Английский

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