Electromechanically tunable graphene-based terahertz metasurface

Roy, Shuvajit; Debnath, Kapil

doi:10.1016/j.optcom.2023.129319

Cited by 7 publications

(4 citation statements)

References 37 publications

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“…A very recent paper proposed a new way of tuning graphene-based THz metasurfaces using an electromechanical method [ 105 ]. The metasurface consists of a free-standing graphene layer supported by an oxide grating on a gold substrate.…”

Section: Metasurface Tuning Strategiesmentioning

confidence: 99%

Recent Advances in Tunable Metasurfaces and Their Application in Optics

Santonocito,

Patrizi,

Toci

2023

Nanomaterials

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Metasurfaces can be opportunely and specifically designed to manipulate electromagnetic wavefronts. In recent years, a large variety of metasurface-based optical devices such as planar lenses, beam deflectors, polarization converters, and so on have been designed and fabricated. Of particular interest are tunable metasurfaces, which allow the modulation of the optical response of a metasurface; for instance, the variation in the focal length of a converging metalens. Response tunability can be achieved through external sources that modify the permittivity of the materials constituting the nanoatoms, the substrate, or both. The modulation sources can be classified into electromagnetic fields, thermal sources, mechanical stressors, and electrical bias. Beside this, we will consider optical modulation and multiple approach tuning strategies. A great variety of tunable materials have been used in metasurface engineering, such as transparent conductive oxides, ferroelectrics, phase change materials, liquid crystals, and semiconductors. The possibility of tuning the optical properties of these metamaterials is very important for several applications spanning from basic optics to applied optics for communications, depth sensing, holographic displays, and biochemical sensors. In this review, we summarize the recent progress on electro-optical magnetic, mechanical, and thermal tuning of metasurfaces actually fabricated and experimentally tested in recent years. At the end of the review, a short section on possible future perspectives and applications is included.

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Section: Metasurface Tuning Strategiesmentioning

confidence: 99%

Recent Advances in Tunable Metasurfaces and Their Application in Optics

Santonocito,

Patrizi,

Toci

2023

Nanomaterials

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“…Materials such as Ge2Sb2Te5 and vanadium dioxide [9][10][11] have been explored for this purpose, finding applications in devices like modulators and switches. Nevertheless, a prevalent limitation in these designs is their continual high power consumption, which hinders their integration into lowpower photonics devices [12].…”

Section: Introductionmentioning

confidence: 99%

Tunable nanophotonic multilayer structures to control mid-infrared atmospheric windows

Nazari,

Banad,

Sharif

2024

2D Photonic Materials and Devices VII

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In this paper, we introduce a novel nanophotonic multilayer structure comprising graphene, polymer, and PbSe to modulate electromagnetic waves within mid-IR atmospheric windows. Through finite-difference time-domain analysis and micro-genetic algorithms, we achieve a tunable perfect absorber, with optimized control over absorption and emission in the mid-IR range. By adjusting the graphene's chemical potential from 0 eV to 1 eV, we demonstrate a dynamic shift in peak absorptance from 4 µm to 4.22 µm and maintain high absorption at incident angles up to 52 degrees, marking significant advancements in mid-IR radiation management.

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“…Researchers from all around the world have recently become increasingly interested in the terahertz gap, which has a frequency range of 0.1 THz to 10 THz [1] and a wavelength range of 30 micrometers to 3 millimeters. Terahertz gap has a wide variety of applications ranging from industrial applications like detecting faults in tablet coating through product inspection, chemical [2], astronomical [3], and physics applications like material characterization, medical applications like cancer detection [5], security applications like detecting weapons in the airports [6], military applications [7], 6G applications [8], sensing applications [9] and many more.…”

Section: Introductionmentioning

confidence: 99%

A Circular Split Ring Resonator Absorber with Graphene Material for Terahertz Communication Applications

Prasad

Pardhasaradhi

Madhav

et al. 2023

Preprint

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In this research article, we proposed a split ring resonator(SRR) based metasurface absorber based on graphene material. The performance of the graphene-based absorber at terahertz frequencies can be altered by varying the chemical potential of graphene material. Because of its excellent tunability and optical responsiveness at terahertz frequency, graphene-based metamaterials have been widely used in optoelectronic devices, sensors, filters, and many more. The proposed structure contains three layers namely graphene-based patch a conductive layer, lossy silicon as a dielectric layer, and finally gold as a bottom conductive layer. The purpose of this research is to present a thorough investigation of graphene-based THz metamaterial absorbers, including modeling and verification of the structure through an equivalent circuit approach. It is very much beneficial to understand the conductive phenomenon of graphene material by tuning the fermi chemical potential.

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Electromechanically tunable graphene-based terahertz metasurface

Cited by 7 publications

References 37 publications

Recent Advances in Tunable Metasurfaces and Their Application in Optics

Recent Advances in Tunable Metasurfaces and Their Application in Optics

Tunable nanophotonic multilayer structures to control mid-infrared atmospheric windows

A Circular Split Ring Resonator Absorber with Graphene Material for Terahertz Communication Applications

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