FEM Approach to the Robust Design of a Graphene-Based 3D Structure for THz Devices

Kuzhir, P.; Mura, Monica La; Lamberti, Patrizia; Paddubskaya, Alesia; Tucci, Vincenzo; Vanyukov, V. V.

doi:10.1109/nmdc50713.2021.9677563

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…Figure 4 depicts the HFSS-simulated transmission characteristic of the proposed structure in the off-state [ 37 ]. A planar periodic structure comprises identical unit cells; therefore, it is evaluated using Floquet ports and master–slave boundary conditions.…”

Section: Resultsmentioning

confidence: 99%

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Design of a Reconfigurable Ultra-Wideband Terahertz Polarization Rotator Based on Graphene Metamaterial

Ding

Zhou

Zhang

et al. 2023

Sensors

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In this work, a reconfigurable ultra-wideband transmissive terahertz polarization rotator based on graphene metamaterial is proposed that can switch between two states of polarization rotation within a broad terahertz band by changing the Fermi level of graphene. The proposed reconfigurable polarization rotator is based on a two-dimensional periodic array of multilayer graphene metamaterial structure, which is composed of metal grating, graphene grating, silicon dioxide thin film, and a dielectric substrate. The graphene metamaterial can achieve high co-polarized transmission of a linearly polarized incident wave at the off-state of the graphene grating without applying the bias voltage. Once the specially designed bias voltage is applied to change the Fermi level of graphene, the polarization rotation angle of linearly polarized waves is switched to 45° by the graphene metamaterial at the on-state. The working frequency band with 45-degree linear polarized transmission remaining above 0.7 and the polarization conversion ratio (PCR) above 90% is from 0.35 to 1.75 THz, and the relative bandwidth reaches 133.3% of the central working frequency. Furthermore, even with oblique incidence at large angles, the proposed device retains high-efficiency conversion in a broad band. The proposed graphene metamaterial offers a novel approach for the design of a terahertz tunable polarization rotator and is expected to be applied in the applications of terahertz wireless communication, imaging, and sensing.

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Section: Resultsmentioning

confidence: 99%

“…Figure 4 depicts the HFSS-simulated transmission charact structure in the off-state [37]. A planar periodic structure compr therefore, it is evaluated using Floquet ports and master-slave bo master-slave boundary conditions, also recognized as linked bou employed to simulate planar periodic structural surfaces.…”

Section: Polarization Rotation Of Terahertz Wavesunclassified

Design of a Reconfigurable Ultra-Wideband Terahertz Polarization Rotator Based on Graphene Metamaterial

Ding

Zhou

Zhang

et al. 2023

Sensors

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“…The pump beam, after traversing a fast delay line, excites the gap of the photoconductive antenna (low-temperature grown GaBiAs). Meanwhile, the probe beam traverses a slow delay line and is directed to For what concerns the FE modelling of the device, due to the sample lateral size much greater than the wavelength in the frequency range of interest, the structure could be considered infinite in the lateral directions, and the FE modelling could be approached by a 2D model of the cross-section of one period of the grating's pattern [46]. Symmetry boundary conditions were applied to the model left and right edges, to represent the pattern replication.…”

Section: Fe Modelling Of a Graphene-enhanced Reflective Grating For T...mentioning

confidence: 99%

Simulation of ageing and wear effect on graphene THz passive components using finite element method

La Mura,

Lamberti,

Kuzhir

2024

J. Phys. D: Appl. Phys.

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In the growing scenario of 2D material-based metamaterials and metasurfaces for Terahertz (THz) applications, assessing the impact of ageing and wear due to environmental stressors on the components’ performance is becoming mandatory to understand the long-term reliability of novel technologies. This paper introduces approaches to assess the ageing and wear effects on THz passive components through numerical simulations. For this purpose, common techniques for introducing 2D materials and thin metal layers in numerical models are discussed. As a case study, this work explores the effects of graphene degradation and reflective metal ageing on the electromagnetic (EM) response of a graphene-enhanced reflective grating for THz absorption and modulation by finite element (FE) analysis. The developed FE model is validated against experimental data obtained through THz Time-Domain Spectroscopy (TTDS). By computing the device's transmission, reflection, and absorption spectra for degrading graphene and metal conductive properties, this work provides insights into the influence of ageing and wear on THz passive components.

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Simulation of Graphene-based Materials and Devices for Sub-Terahertz Applications

Mura,

Lamberti,

Tucci

2023

2023 IEEE Nanotechnology Materials and Devices Conference (NMDC)

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FEM Approach to the Robust Design of a Graphene-Based 3D Structure for THz Devices

Cited by 4 publications

References 20 publications

Design of a Reconfigurable Ultra-Wideband Terahertz Polarization Rotator Based on Graphene Metamaterial

Design of a Reconfigurable Ultra-Wideband Terahertz Polarization Rotator Based on Graphene Metamaterial

Simulation of ageing and wear effect on graphene THz passive components using finite element method

Simulation of Graphene-based Materials and Devices for Sub-Terahertz Applications

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