Terahertz wavefront manipulating by graphene aperture based metasurface

Ding, Pei; Lv, Chuang; Shao, Li; Tian, Ximin; Li, Yan; He, Jian‐Jun

doi:10.1016/j.photonics.2019.100728

Cited by 9 publications

(3 citation statements)

References 62 publications

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“…Because of the boundary conditions in graphene, its radiation characteristics make it extremely sensitive to external excitation [7][8]. Conventionally, using external bias like voltage splitter which is controlled by FPGA, we can tune the AC conductivity of graphene [9]. Based on this mono-atomic specification, graphene can be modelled as a complex surface conductivity tensor [10].…”

Section: Introductionmentioning

confidence: 99%

Graphene-Based Reconfigurable Intelligent Meta-Surface Structure for THz Communications

Ojaroudi

Loscrì

2021

2021 15th European Conference on Antennas and Propagation (EuCAP)

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In this paper, a graphene based reconfigurable intelligent metasurface structure is proposed for terahertz (THz) communication applications. The proposed structure consists of multilayer unit cells with a graphene radiating patch. By using different values of biasing voltages, the chemical potential (µc) of the graphene is changed which leads to have different reflected phases. Based on this property we are able to create different reflected phase distributions within the full structure metasurface array which can be controlled by coding pattern in processing units. The proposed unit cell can provide an acceptable reflection characteristic around 4.35 THz. In addition, by changing the biasing voltage, four states are generated which can transmit 1-bit and 2-bits data. The proposed metasurface structure has small size and high flexibility in controlling radiation patterns. The simulated results such as reflected phase distributions and reconfigurable radiation patterns show the effectiveness of the proposed design for THz communication.

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Section: Introductionmentioning

confidence: 99%

Graphene-Based Reconfigurable Intelligent Meta-Surface Structure for THz Communications

Ojaroudi

Loscrì

2021

2021 15th European Conference on Antennas and Propagation (EuCAP)

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“…Then, Huang et al experimentally realized the reconfigurable carpet cloak and dynamical illusion by tuning varactors loaded on the metal metasurface at the microwave frequency [36]. Different from metal and dielectric materials, graphene has flexible and adjustable conductivity and is considered an ideal candidate for tunable metasurfaces in the terahertz and mid-infrared regions [7,[39][40][41]. In 2018, Li [37] and Biswas [38] proposed the tunable diffuse reflection and phase gradient metasurfaces based on graphene patches and graphene strips, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the characteristic of electrically connected graphene layer, the graphene aperture-based metasurface is more convenient for gate-controlled tunable devices than that consisting of isolated graphene microstructures [7,41]. Here, based on local phase compensation mechanism, we first design a carpet cloak in terahertz regime by using the graphene aperturebased metasurface and explore its performance for broadband and wide-angle cloaking.…”

Section: Introductionmentioning

confidence: 99%

Broadband and wide-angle terahertz carpet cloaks based on pattered graphene metasurfaces

Ding

Tian

et al. 2020

J. Phys. D: Appl. Phys.

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Conventional metasurface carpet cloak generally has a narrow working bandwidth and a small incident angle range, which is far from meeting the requirements of modern military for broadband and wide-angle cloaking. Based on graphene apertures and graphene patches, we propose the design of metasurface carpet cloaks for terahertz wave and explore their application potential in realizing broadband and wide-angle cloaking. Simulation results demonstrate that the carpet cloaks based on graphene apertures and patches can achieve a large working bandwidth of 35.7% and 52.6%, and a wide angular span of ±30° and ±40°, respectively. The cloaking performance and the working bandwidths of the two graphene metasurface carpet cloaks can be tuned by changing the graphene Fermi energy uniformly. The carpet cloak constructed by graphene patches has a larger bandwidth and a wider angle domain than that by graphene apertures, which can be understood by comparing the phase dispersion of the two graphene metasurfaces.

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Polarization independent and broadband achromatic metalens in ultraviolet spectrum

Liu

Wang

et al. 2021

Optics Communications

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Terahertz wavefront manipulating by graphene aperture based metasurface

Cited by 9 publications

References 62 publications

Graphene-Based Reconfigurable Intelligent Meta-Surface Structure for THz Communications

Graphene-Based Reconfigurable Intelligent Meta-Surface Structure for THz Communications

Broadband and wide-angle terahertz carpet cloaks based on pattered graphene metasurfaces

Polarization independent and broadband achromatic metalens in ultraviolet spectrum

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