scholarly journals Graphene Based Controllable Broadband Terahertz Metamaterial Absorber with Transmission Band

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2409 ◽  
Author(s):  
Qihui Zhou ◽  
Song Zha ◽  
Peiguo Liu ◽  
Chenxi Liu ◽  
Li-an Bian ◽  
...  
Keyword(s):  
Sandwich Structure ◽  
Graphene Layer ◽  
Electromagnetic Compatibility ◽  
Transmission Band ◽  
Frequency Selective Surface ◽  
Metamaterial Absorber ◽  
Potential Applications ◽  
Transmission Window ◽  
Simulation Results ◽  
Broadband Terahertz

A graphene-based controllable broadband terahertz metamaterial absorber with transmission band is presented in this paper. It consists of a graphene-SiO2-frequency selective surface (FSS) sandwich structure. The sinusoidal graphene layer supports continuous plasmonic resonances, forming a broad electric-tuning absorbing band. Bandpass FSS constructs a transmission window outside the absorbing band. The simulation results indicate that the absorption from 0.5 THz to 1 THz can be tuned continuously from 0.4 to 0.9 with angle and polarization independence. A transparent window peaking at 1.65 THz maintains high transmittance over 0.7. The metamaterial absorber has potential applications for detection, stealth, filtering, and electromagnetic compatibility.

scholarly journals Dual-Band Perfect Metamaterial Absorber Based on an Asymmetric H-Shaped Structure for Terahertz Waves

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2193 ◽  
Author(s):  
Taiguo Lu ◽  
Dawei Zhang ◽  
Peizhen Qiu ◽  
Jiqing Lian ◽  
Ming Jing ◽  
...  
Keyword(s):  
Metamaterial Absorber ◽  
Dual Band ◽  
Interference Theory ◽  
Metamaterial Structure ◽  
Terahertz Waves ◽  
Potential Applications ◽  
Band Absorption ◽  
Perfect Metamaterial Absorber ◽  
Simulation Results ◽  
Absorption Frequencies

We designed an ultra-thin dual-band metamaterial absorber by adjusting the side strips’ length of an H-shaped unit cell in the opposite direction to break the structural symmetry. The dual absorption peaks approximately 99.95% and 99.91% near the central resonance frequency of 4.72 THz and 5.0 THz were obtained, respectively. Meanwhile, a plasmon-induced transmission (PIT) like reflection window appears between the two absorption frequencies. In addition to theoretical explanations qualitatively, a multi-reflection interference theory is also investigated to prove the simulation results quantitatively. This work provides a way to obtain perfect dual-band absorption through an asymmetric metamaterial structure, and it may achieve potential applications in a variety of fields including filters, sensors, and some other functional metamaterial devices.

scholarly journals A Non-Volatile Tunable Terahertz Metamaterial Absorber Using Graphene Floating Gate

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 333
Author(s):  
Jinjun Bai ◽  
Wei Shen ◽  
Jia Shi ◽  
Wei Xu ◽  
Shusheng Zhang ◽  
...  
Keyword(s):  
Physical Mechanism ◽  
Metamaterial Absorber ◽  
Floating Gate ◽  
Center Frequency ◽  
Field Energy ◽  
The Finite Element Method ◽  
Photoelectric Detection ◽  
Potential Applications ◽  
Simulation Results ◽  
Metal Absorber

Based on the graphene floating gate, a tunable terahertz metamaterial absorber is proposed. Compared with the traditional graphene–dielectric–metal absorber, our absorber has the property of being non-volatile and capacity for anti-interference. Using the finite element method, the paper investigates the absorption spectra, the electric field energy distribution, the tunability and the physical mechanism. In addition, we also analyse the influence of geometry, polarization and incident angles on the absorption. Simulation results show that the bandwidth of the absorption above 90% can reach up to 2.597 THz at the center frequency of 3.970 THz, and the maximum absorption can be tuned continuously from 14.405% to 99.864% by controlling the Fermi level from 0 eV to 0.8 eV. Meanwhile, the proposed absorber has the advantages of polarization insensitivity and a wide angle, and has potential applications in imaging, sensing and photoelectric detection.

Tunable broadband terahertz metamaterial absorber using multi-layer black phosphorus and vanadium dioxide

2020 ◽  
Vol 53 (14) ◽  
pp. 145105 ◽  
Author(s):  
Tongling Wang ◽  
Lizhi Qu ◽  
Lingfei Qu ◽  
Yuping Zhang ◽  
Huiyun Zhang ◽  
...  
Keyword(s):  
Vanadium Dioxide ◽  
Metamaterial Absorber ◽  
Black Phosphorus ◽  
Broadband Terahertz

Broadband Terahertz Metamaterial Absorber Based on Asymmetric Resonators With Perfect Absorption

2015 ◽  
Vol 5 (3) ◽  
pp. 406-411 ◽  
Author(s):  
Yongzheng Wen ◽  
Wei Ma ◽  
Joe Bailey ◽  
Guy Matmon ◽  
Xiaomei Yu
Keyword(s):  
Metamaterial Absorber ◽  
Perfect Absorption ◽  
Broadband Terahertz

Electric Field Uniformity Characteristic of a Reverberation Chamber with a Composite QRD

2013 ◽  
Vol 684 ◽  
pp. 518-521
Author(s):  
Eugene Rhee ◽  
Ji Hoon Lee
Keyword(s):  
Electric Field ◽  
Electromagnetic Compatibility ◽  
Quadratic Residue ◽  
Test Facility ◽  
Uniform Electric Field ◽  
Reverberation Chamber ◽  
Standard Requirement ◽  
International Standard ◽  
Field Uniformity ◽  
Simulation Results

This paper presents the electric field characteristics in a reverberation chamber which is an electromagnetic compatibility test facility that uses a stirrer to generate a uniform electric field inside it. In this paper, a diffuser is introduced from acoustics and newly designed to overcome problems of a stirrer. To validate the effect of a diffuser, a composite quadratic residue diffuser and a reverberation chamber are modeled. Then, the field uniformity inside the reverberation chamber is simulated by XFDTD 6.2 simulation program. Simulation results show that the electric field uniformity in the reverberation chamber satisfies the international standard requirement. This shows that the composite quadratic residue diffuser can be substituted for a stirrer.

Comment on “A Broadband Terahertz Metamaterial Absorber Based on Two Circular Split Rings”

2019 ◽  
Vol 55 (6) ◽  
pp. 1-3
Author(s):  
Xing-Liang Tian ◽  
Xin-Ru Kong ◽  
Guo-Biao Liu ◽  
Hai-Feng Zhang
Keyword(s):  
Metamaterial Absorber ◽  
Broadband Terahertz

scholarly journals On The Study of Development of X Band Metamaterial Radar Absorber

2012 ◽  
Vol 1 (3) ◽  
pp. 94 ◽  
Author(s):  
M. A. Abdalla ◽  
Z. Hu
Keyword(s):  
Metamaterial Absorber ◽  
Theoretical Concepts ◽  
Centre Frequency ◽  
High Impedance ◽  
Full Wave ◽  
X Band ◽  
New Development ◽  
Simulation Results ◽  
Absorption Level ◽  
High Absorption

A new development of metamaterial applications in radar absorbers for X band is introduced. Two modifications were suggested based on two different approaches which are a new called fan shaped resonator absorber and a modified high impedance metamaterial absorber. Both approaches introduce thin radar absorber (5.3% at centre frequency) with wide bandwidth and high absorption level. The theoretical concepts of each design are explained and validated using full wave simulation. Results illustrate that the new development can achieve wider bandwidth, multiple operating bands; the increase in bandwidth is up to 8 times the conventional one. Moreover, the reported absorbers have capability to operate with different polarizations.

Design of Ultra-Thin Broadband Terahertz Metamaterial Absorber Based on Patterned Graphene

2017 ◽  
Vol 44 (7) ◽  
pp. 0703024
Author(s):  
高红 Gao Hong ◽  
延凤平 Yan Fengping ◽  
谭思宇 Tan Siyu ◽  
白燕 Bai Yan
Keyword(s):  
Metamaterial Absorber ◽  
Broadband Terahertz

scholarly journals Planar Dual Polarized Metasurface Array for Microwave Energy Harvesting

Electronics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1985
Author(s):  
Maged A. Aldhaeebi ◽  
Thamer S. Almoneef
Keyword(s):  
Energy Harvesting ◽  
Dielectric Substrate ◽  
Metamaterial Absorber ◽  
Absorption Efficiency ◽  
Unit Cell ◽  
Resistive Load ◽  
Electromagnetic Energy Harvesting ◽  
Absorbed Power ◽  
Simulation Results ◽  
Dual Polarized

The design of a dual polarized metasurface collector based on the metamaterial full absorption concept for electromagnetic energy harvesting is introduced. Unlike previous metamaterial absorber designs, here the power absorbed is mostly dissipated across a resistive load rather than within the dielectric substrate. This is achieved by channeling the absorbed power to an optimal resistive load through a via hole. The simulation results show that a power absorption efficiency of 98% is achieved at an operating frequency of 2 GHz for a single unit cell. A super unit cell consisting of four cells with alternating vias was also designed to produce a dual polarized metasurface. The simulation results yielded a radiation to AC efficiency of around 98% for each polarization.

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