Graphene-Metamaterial Based Tunable Broadband Polarization Insensitive Absorber for Terahertz Antenna Design

IEEE Access, Journal Year: 2024, Volume and Issue: 12, P. 48654 - 48667

Published: Jan. 1, 2024

The advent of graphene has opened new avenues for the design high-performance metamaterial devices, particularly in realm electromagnetic absorption applications. This paper introduces a novel broadband tunable absorber (GMMA) utilizing graphene. Through numerical simulations, our proposed GMMA demonstrates bandwidth 3 THz (1.14 – 4.14 THz) with absorptivity exceeding 90% both transverse magnetic (TM) and electric (TE) modes. A comprehensive analysis, using transmission line equivalent circuit model, is conducted to find out impedance components all corresponding layers, which can be significant determine matching. exhibits wideband tunability, polarization insensitivity, robust tolerance structural variations, making it promising candidate diverse applications terahertz (THz) band especially antenna regime. Our achieve gain 37.48 dB, directivity 32.81 return loss -34 an efficiency 99.96%. research provides valuable contribution development GMMAs frequencies, addressing increasing demand high-speed efficient devices modern era science technology.

Language: Английский

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Passive trapping of biomolecules in hotspots with all-dielectric terahertz metamaterials

Biosensors and Bioelectronics, Journal Year: 2024, Volume and Issue: 251, P. 116126 - 116126

Published: Feb. 12, 2024

Language: Английский

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Design and experimental realization of triple-band filtering metamaterial in sub-terahertz band enabled by conductivity coupling response of two identical split rings

Optics & Laser Technology, Journal Year: 2024, Volume and Issue: 183, P. 112345 - 112345

Published: Dec. 17, 2024

Language: Английский

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Graphene-Based SPR Sensor Design for Bio-Alcohol Detection in the Terahertz Regime with Machine Learning Optimization Using XGBoost Regressor

Plasmonics, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 10, 2025

Language: Английский

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Enhanced Terahertz Graphene Metasurface Biosensor for Early Breast Cancer Detection with Machine Learning Optimization Based on Locally Weighted Linear Regression

Plasmonics, Journal Year: 2025, Volume and Issue: unknown

Published: March 22, 2025

Language: Английский

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Multi-frequency polarization and electro-optical modulator based on triple plasmon- induced transparency in monolayer graphene metamaterials

Diamond and Related Materials, Journal Year: 2023, Volume and Issue: 138, P. 110216 - 110216

Published: July 19, 2023

Language: Английский

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Tunable multiband circular dichroism and asymmetric transmission enabled by chiral quasi-BICs in dielectric metasurfaces covered with graphene

Optical Materials, Journal Year: 2024, Volume and Issue: 148, P. 114798 - 114798

Published: Jan. 1, 2024

Language: Английский

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Color coded metadevices toward programmed terahertz switching

Light Science & Applications, Journal Year: 2024, Volume and Issue: 13(1)

Published: June 25, 2024

Abstract Terahertz modulators play a critical role in high-speed wireless communication, non-destructive imaging, and so on, which have attracted large amount of research interest. Nevertheless, all-optical terahertz modulation, an ultrafast dynamical control approach, remains to be limited terms encoding multifunction. Here we experimentally demonstrated optical-programmed switching realized by combining optical metasurfaces with the metasurface, resulting 2-bit dual-channel encoding. The made up semiconductor islands artificial microstructures, enables effective programming providing multiple frequency channels modulation at nanosecond level. Meanwhile, covered metasurface alter spatial light field distribution obtain color code. According time-domain coupled mode theory analysis, energy dissipation modes can independently controlled excitation, explains principle well. This work establishes platform for programmed metadevices may further advance application composite manipulation.

Language: Английский

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Mixed‐Halide Perovskites with Suppressed Phase Segregation for Large Modulation Depth and High‐Stability Terahertz Modulators

Small Structures, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 28, 2025

Metal‐halide perovskites with tunable bandgaps are promising semiconductors in heterojunction engineering for high‐performance terahertz modulators. However, most traditional perovskite‐based modulators reported so far difficult to simultaneously achieve both large modulation depth and high environmental stability a simple structure. To overcome this bottleneck, herein, the Cs 0.25 MA 0.75 PbI 2 Br/MAPbI 3 /Si dual‐heterojunction modulator is fabricated using two‐step spin‐coating method. In device, Br film formed by substituting − at X‐site + A‐site from MAPbI can not only tailor but also suppress phase segregation, while promote accumulation of photon‐generated electrons Si substrate. Moreover, maximum THz 71% 0.42 THz. Compared Br/Si or samples, be increased almost 100%. After continuous operation an environment 70% humidity 10 h, device still operate stably. This study illuminates potential devices, as well offers new strategies improve perovskites.

Language: Английский

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Ultrawideband Polarization-Independent Nanoarchitectonics: A Perfect Metamaterial Absorber for Visible and Infrared Optical Window Applications

Nanomaterials, Journal Year: 2022, Volume and Issue: 12(16), P. 2849 - 2849

Published: Aug. 18, 2022

This article presents numerical analysis of an ultrathin concentric hexagonal ring resonator (CHRR) metamaterial absorber (MMA) for ultrawideband visible and infrared optical window applications. The proposed MMA exhibits absorption above 90% from 380 to 2500 nm average absorbance 96.64% at entire operational bandwidth with a compact unit cell size 66 × nm2. designed shows maximum 99% 618 nm. the covers windows. nickel material has been used design top bottom layer MMA, where aluminium nitride (AlN) as substrate. polarization-independent properties due symmetry stable label is also achieved oblique incident angles up 70 °C. property analyzed by evaluation, parametric various investigations. property, surface current allocation, magnetic field electric have explore properties. promising prospects in numerous applications like detection, solar cells, gas detection sensors, imaging, etc.

Language: Английский

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