Journal ArticleDOI
Dual-Band Reconfigurable Terahertz Patch Antenna With Graphene-Stack-Based Backing Cavity
TLDR
In this article, a dual-band reconfigurable terahertz patch antenna using a graphene-stack-defined backing cavity is presented, which employs patch resonance based on backing cavity defined by interleaved graphene/Al 2O3 stacks, which can be dynamically dual-resonance frequency-tuned on large range about 1 THz via electrostatic gating on the graphene stack.Abstract:
The concept of dual-band reconfigurable terahertz patch antenna using a graphene-stack-defined backing cavity is presented. The proposed antenna employs patch resonance based on backing cavity defined by interleaved graphene/Al 2O3 stacks, which can be dynamically dual-resonance frequency-tuned on large range about 1 THz via electrostatic gating on the graphene stack. The performance is analyzed in terms of its directivity, sidelobe suppression, return loss, and bandwidth for different chemical potential. By applying different voltages on graphene stack, the direction of the antenna main beam can be steered with appreciable variation range.read more
Citations
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Journal ArticleDOI
Graphene based functional devices: A short review
Rong Wang,Xingang Ren,Xingang Ren,Ze Yan,Li Jun Jiang,Wei E. I. Sha,Guang-Cun Shan,Guang-Cun Shan +7 more
TL;DR: In this article, a brief view of functional devices at microwave, terahertz, and optical frequencies is presented, and their fundamental physics and computational models are discussed as well.
Journal ArticleDOI
A Review on the Development of Tunable Graphene Nanoantennas for Terahertz Optoelectronic and Plasmonic Applications
Zaka Ullah,Gunawan Witjaksono,Illani Mohd Nawi,Nelson Tansu,Muhammad Irfan Khattak,Muhammad Junaid +5 more
TL;DR: A detailed review of the essential explanation behind graphene nanoantennas experimental proofs for the developments of graphene-based plasmonics antennas, achieving enhanced light–matter interaction by exploiting graphene material conductivity and optical properties is provided.
Journal ArticleDOI
Proximity-coupled two-port multi-input-multi-output graphene antenna with pattern diversity for THz applications
TL;DR: The aspect ratio of graphene patch and physical parameters of the antenna are selected for obtaining the single mode operation with the resonance of T M 12 , mode and the utilization of the graphene material provides the flexibility in tuning the antenna response.
Journal ArticleDOI
Tunable Terahertz Dielectric Resonator Antenna
TL;DR: In this article, an annular dielectric resonator antenna (DRA) is implemented for THz applications, which is loaded with graphene disk for obtaining the tunability in the frequency response.
Journal ArticleDOI
Reconfigurable graphene antenna for THz applications: a mode conversion approach.
TL;DR: A reconfigurable graphene antenna is designed and numerically analyzed that contains a radiating graphene patch and non-radiating graphene ring and can be steered in different directions as per the location of applied gate voltage at the periphery of graphene ring.
References
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Electric Field Effect in Atomically Thin Carbon Films
Kostya S. Novoselov,Andre K. Geim,Sergey V. Morozov,Da Jiang,Y. Zhang,S. V. Dubonos,Irina V. Grigorieva,A. A. Firsov +7 more
TL;DR: Monocrystalline graphitic films are found to be a two-dimensional semimetal with a tiny overlap between valence and conductance bands and they exhibit a strong ambipolar electric field effect.
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Electromagnetic parameter retrieval from inhomogeneous metamaterials
David R. Smith,David R. Smith,D. C. Vier,Th. Koschny,Th. Koschny,Costas M. Soukoulis,Costas M. Soukoulis +6 more
TL;DR: It is shown here that a modification of the standard S-parameter retrieval procedure yields physically reasonable values for the retrieved electromagnetic parameters, even when there is significant inhomogeneity within the unit cell of the structure.
Journal ArticleDOI
Tunable infrared plasmonic devices using graphene/insulator stacks
Hugen Yan,Xuesong Li,Bhupesh Chandra,George S. Tulevski,Yanqing Wu,Marcus Freitag,Wenjuan Zhu,Phaedon Avouris,Fengnian Xia +8 more
TL;DR: Transparent photonic devices based on graphene/insulator stacks, which are formed by depositing alternating wafer-scale graphene sheets and thin insulating layers, then patterning them together into photonic-crystal-like structures are demonstrated, showing experimentally that the plasmon in such stacks is unambiguously non-classical.
Journal ArticleDOI
Optical far-infrared properties of a graphene monolayer and multilayer
TL;DR: In this paper, the features of the graphene mono-and multilayer reflectance in the far-infrared region were analyzed as a function of frequency, temperature, and carrier density taking the intraband conductance and the interband electron absorption into account.
Journal ArticleDOI
Switching terahertz waves with gate-controlled active graphene metamaterials
Seunghoon Lee,Muhan Choi,Muhan Choi,Teun-Teun Kim,Teun-Teun Kim,Seungwoo Lee,Ming Liu,Xiaobo Yin,Hongkyw Choi,Seung S. Lee,Choon-Gi Choi,Sung-Yool Choi,Xiang Zhang,Xiang Zhang,Bumki Min +14 more
TL;DR: It is demonstrated that substantial gate-induced persistent switching and linear modulation of terahertz waves can be achieved in a two-dimensional metamaterial, into which an atomically thin, gated two- dimensional graphene layer is integrated.