Dynamic and Active THz Graphene Metamaterial Devices

Wang, Lan; An, Ning; He, Xusheng; Zhang, Xinfeng; Zhu, Ao; Yao, Baicheng; Zhang, Yaxin

doi:10.3390/nano12122097

Cited by 19 publications

(8 citation statements)

References 161 publications

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“…Graphene electron it become a role of zero-bandgap material called Dirac point reason for conduction and valance bond direct connected to each other [4,5,6]. In some previous years, have more expectation in terahertz science and technology, wide band of research areas such a long distance communication, wireless, medical devices, weather predictions and geological sciences etc.…”

Section: Introductionmentioning

confidence: 99%

Investigating Thermal Conductivity in Graphene Nanocomposites

Sharma,

Yadav,

Basu

2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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in natural occurrences, two carbon isotopes maintain stability: carbon-12, which accounts for roughly 99% of all naturally found carbon, and carbon-13, constituting approximately 1%. These proportional distributions are also observed in laboratory-produced graphene. Graphene, a single layer composed of sp2-bonded atoms arranged in a hexagonal pattern with a bond length of0.142 nm, exhibits outstanding characteristics such as a high tensile strength of about 130 GPA and exceptional electrical conductivity, holding promise for advancements in battery efficiency. I synthesized graphene using microwave irradiation techniques applied to graphite raw powder. The synthesized of graphene deposited onto two metallic strips measuring 1 mm in dimensions. The incorporation of copper enhances graphene's conductivity and facilitates precise tuning at higher frequencies. The experimental findings presented in this study investigate the adjustable nature of the transmission coefficient (transmitting from port 1 to port 2) within the graphene patch. These findings demonstrate fluctuations of -20 dB at 1.7 GHz, -23 dB at both 2 GHz and 7 GHz, and -24 dB at 8 GHz, achieved through a simultaneous increase in DC bias voltage exceeding the saturation threshold.

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Section: Introductionmentioning

confidence: 99%

Investigating Thermal Conductivity in Graphene Nanocomposites

Sharma,

Yadav,

Basu

2024

Proceedings of the 9th World Congress on Momentum, Heat and Mass Transfer

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“…Metamaterials are arti cial materials that are composed of periodic sub-wavelength structures (Pendry 2000; Islam et al 2016; Wang et al 2022). Owing to their unique properties, they attracted extensive interest in many applications such as polarization conversion, cloaking, and absorbance (Xiao et Zhao et al 2018b).…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of quad-band polarization-insensitive infrared perfect metamaterial absorber with a wide-incident angle

Abouelez

Abdulaleem

2023

Preprint

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A novel quad-band infrared perfect metamaterial absorber (QPMA) is proposed and numerically investigated. The structure of the QPMA is composed of coaxial multi-layer dielectric (SiO2) disks of circular shape with different diameters where each disk is surrounded by a gold ring. All disks are placed on a SiO2 dielectric spacer and an impermeable gold ground layer. Simulation results reveal that the proposed absorber has four absorption peaks around wavelengths of 1064 nm, 1550 nm, 2080 nm, and 3000 nm. Additionally, the QPMA structure enjoys a good absorption performance for a wide range of incident angles for both TE and TM waves. It achieves absorption greater than 85% at incident angles up to 40o at 1064 nm, and absorption greater than 90% for the other bands at incident angles up to 50o. Moreover, due to the symmetrical shape of the structure, the absorption is insensitive to wave polarization changes. The structure under investigation will help in laser stealth, infrared photodetection, and medical applications due to perfect absorption performance and multi-band capability.

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“…The absorption properties of graphene in the visible to near-infrared region are dominated by the optical conductivity originating from the interband transition, which yield a constant absorption of 2.3% [ 15 ]. In the far-infrared and THz spectral region, however, the frequency-dependent optical response of graphene is governed by intraband transition [ 16 ], which can be changed by exploiting its tunable Fermi energy ( E f ) and well described by the Drude model [ 17 ]. Such unique characteristics make graphene a promising material for THz modulators through electrical gating.…”

Section: Introductionmentioning

confidence: 99%

Angular-Dependent THz Modulator with Hybrid Metal-Graphene Metastructures

et al. 2023

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The coupling effects of surface plasmon resonance (SPR) from metamaterials induce variation in both the frequency and intensity of plasmonic modes. Here, we report an angular-dependent THz modulator with hybrid metal–graphene metastructures. The metastructures composed of the period gold split-rod arrays on top of a monolayer graphene, which show redshift modulation in the THz region with an increasing incident angle due to the strong out-of-plane magnetic flux introduced by the clockwise circular current at the oblique incidence. By utilizing graphene-based actively tunable conductor with ion-gel electrical gating, the THz transmission can be significantly modified. The modulation depth of the hybrid metal–graphene metastructure modulator can reach ~37.6% at 0.62 THz with a gate voltage of −3 V. The theoretical modeling of transmitted dependency on frequency and incident angle is demonstrated at different Fermi energies, which fits well with the experimental results. This hybrid device can offer a useful method for THz applications (such as angle sensors or angular-resolved spectroscopy), where angle-dependent modulation is needed.

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Dynamic and Active THz Graphene Metamaterial Devices

Cited by 19 publications

References 161 publications

Investigating Thermal Conductivity in Graphene Nanocomposites

Investigating Thermal Conductivity in Graphene Nanocomposites

Design and analysis of quad-band polarization-insensitive infrared perfect metamaterial absorber with a wide-incident angle

Angular-Dependent THz Modulator with Hybrid Metal-Graphene Metastructures

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