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 and wide-angle plasmonic light absorber based on all-dielectric gallium arsenide (GaAs) metasurface in visible and near-infrared region

Results in Physics, Journal Year: 2024, Volume and Issue: 58, P. 107509 - 107509

Published: Feb. 21, 2024

High-performance and cost-effective broadband light absorbers are crucial for various optical applications, including solar energy harvesting, thermophotovoltaic systems, integrated photoelectric devices. In this study, an ultra-broadband wide-angle plasmonic absorber (PLA) based on all-dielectric gallium arsenide (GaAs) metasurface in the visible near-infrared regions is proposed numerically investigated. The unit-cell of PLA consisted GaAs cylinder resonator (CR) adhered ultra-thin spacer layer backed with a tungsten (W) substrate. Numerical simulation results show that absorption peak up to 99.85 %, 99.9 % 99.98 at 0.452 μm, 0.712 μm 1.596 respectively. addition, strong over 90 also can be achieved from 0.39 2.09 relative bandwidth 137.1 %. ultrabroadband further demonstrated by equivalent circuit model (ECM), which displays excellent agreement full-wave numerical performed using finite element method (FEM). simulated electromagnetic (EM) field distributions reveal designed mainly excited propagating surface plasmon (PSP), located (LSP), cavity resonance modes combined coupling effect between adjacent CRs. polarization-insensitive wide incident angles both transverse electric (TE) magnetic (TM) modes. properties adjusted varying geometric parameters unit-cell. achieves remarkable short-circuit current density 64.75569 mA/cm2 exhibits nearly perfect trapping due effective multiple resonances, resulting enhanced photovoltaic performance. Thus, potential application photodetectors, thermal imaging, harvesting

Language: Английский

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Transmission/reflection mode switchable ultra-broadband terahertz vanadium dioxide (VO2) metasurface filter for electromagnetic shielding application

Surfaces and Interfaces, Journal Year: 2024, Volume and Issue: 49, P. 104403 - 104403

Published: May 3, 2024

Language: Английский

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Ultra-broadband and wide-angle plasmonic absorber based on all-dielectric gallium arsenide pyramid nanostructure for full solar radiation spectrum range

International Journal of Thermal Sciences, Journal Year: 2024, Volume and Issue: 201, P. 109043 - 109043

Published: March 31, 2024

Language: Английский

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Tunable VO2 metasurface for reflective terahertz linear and circular polarization wavefront manipulation at two frequencies independently

Physica B Condensed Matter, Journal Year: 2024, Volume and Issue: 681, P. 415848 - 415848

Published: March 15, 2024

Language: Английский

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Dual-narrowband terahertz metamaterial absorber based on all-metal vertical ring array for enhanced sensing application

Physica Scripta, Journal Year: 2024, Volume and Issue: 99(9), P. 095503 - 095503

Published: July 20, 2024

Abstract In this paper, a novel design of dual-narrowband metamaterial absorber (MMA) was proposed for using as high-performance refractive index (RI) sensor in the terahertz (THz) region. The MMA is based on vertical-ring-shaped (VRS) structure gold film array. Through numerical simulation, it found that can achieve high absorption levels 99.8% and 94.6% at 1.723 THz 2.457 THz, respectively, which are consistent with values obtained coupling mode theory (CMT). also exhibits Q-factor about 27.35 102.38, close to CMT 29.94 98.34. dual-band strong attributed guided modes critical resonance, properties be adjusted by changing geometrical parameters unit-cell structure. has narrowband higher Q-factor, making suitable RI sensing, sensitivity 1.66 1.88 RIU −1 , figure-of-merit (FOM) 259.4 659.7 respectively. These findings open up new opportunities development highly efficient MMAs, have potential applications biochemical sensing detection

Language: Английский

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Tri-band terahertz metamaterial absorber based on structural Ti₃C₂T_x MXene for enhanced sensing application

IEEE Sensors Journal, Journal Year: 2024, Volume and Issue: 24(18), P. 28889 - 28896

Published: Aug. 8, 2024

Language: Английский

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A novel design of THz resonance gas sensor with advanced 2-bit encoding capabilities

Optical and Quantum Electronics, Journal Year: 2024, Volume and Issue: 56(9)

Published: Sept. 5, 2024

Language: Английский

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Microstrip antenna loaded with focusing metasurface for high-gain dual-polarization and bidirectional radiation

Journal of Applied Physics, Journal Year: 2025, Volume and Issue: 137(1)

Published: Jan. 3, 2025

In this paper, we propose a microstrip antenna that incorporates dual-polarization and bidirectional focusing metasurface (MS) for achieving high-gain transmission in circular polarization (CP) reflection linear (LP) radiation, respectively. Initially, design MS enables independent manipulation of the transmitted CP wave at lower frequency 8.2 GHz reflected LP higher 16.2 GHz, The unit-cell comprises combination an outer bilayered split-ring resonator, along with inner arc-shaped disk resonators, all separated by dielectric substrate. Subsequently, coaxial-fed laminated is designed capable realizing radiation gain approximately 4.9 dBic 4.8 dBi, To improve performance, construct integrated MS. This configuration to achieve peak 13.1 14.6 dBi relative bandwidth 6.79% (at GHz) 13.54% reflective wave, evaluate practicality our proposed design, fabricated measured antenna, both without results obtained from these measurements closely align simulations, thereby validating effectiveness antenna. provides practical solution facilitating high-speed information communication systems.

Language: Английский

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Designing a High-Sensitivity Microscale Triple-Band Biosensor Based on Terahertz MTMs to Provide a Perfect Absorber for Non-Melanoma Skin Cancer Diagnostic

IEEE photonics journal, Journal Year: 2024, Volume and Issue: 16(2), P. 1 - 13

Published: March 27, 2024

non-melanoma skin cancer (NMSC) is among the most prevalent forms of originating in top layer skin, with basal cell carcinoma (BCC) and squamous (SCC) being its primary categories. While both types are highly treatable, success treatment hinges on early diagnosis. Early-stage NMSC detection can be achieved through clinical examination, typically involving visual inspection. An alternative, albeit invasive, method a biopsy. Microwave imaging has gained prominence for non-invasive various cancers, leveraging distinct dielectric properties healthy malignant tissues to discriminate tumors categorize them as benign or malignant. Recent studies demonstrate potential terahertz (THz) spectroscopy detecting biomarkers by aligning electromagnetic wave frequencies low THz range (0.1 10 THz) resonant biomolecules, such proteins. This study proposes an innovative microscale biosensor designed operate high-sensitivity efficient diagnosis cancer. By incorporating meticulously metamaterial layers, sensor's absorption controlled, critical aspect discriminating between normal NMSC-affected skin. In particular, interaction waves, influenced unique vibrational resonances molecules within tissue, crucial propagation scattering. Extensive numerical showcased suitability proposed diagnosis, illustrated specific case studies. These findings hold pave way further development microwave-imaging-based techniques other

Language: Английский

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