scholarly journals Multi-Band Polarization Insensitive Ultra-Thin THz Metamaterial Absorber for Imaging and EMI Shielding Applications

2021 ◽  
Vol 10 (3) ◽  
pp. 43-49
Author(s):  
G. Saxena ◽  
Y. Khanna ◽  
Y. K. Awasthi ◽  
P. Jain
Keyword(s):  
Return Loss ◽  
Metamaterial Absorber ◽  
Circular Ring ◽  
Unit Cell Dimension ◽  
Polarization Angle ◽  
Emi Shielding ◽  
Thz Imaging ◽  
Wide Range ◽  
Polarization Insensitive ◽  
Multi Band

this article, a multi-band polarization-insensitive metamaterial absorber is designed for THz imaging and EMI shielding. A unique oval-shaped structure with three circular ring-shaped resonators is proposed with a unit cell dimension of36×36×19.6μm3. The absorbance of the proposed multiband MMA is 98.57%, 90%and 99.85% at 5.58, 7.98-8.84, 11.45THz frequency respectively. Return loss is nearly the same for the changing incident and polarization angle. Therefore, this metamaterial absorber with a wide range of polarization insensitivity is found and it is also suitable for quantum RADAR Imaging, energy harvesting, and optoelectronic devices.

Design and Analysis of a Triple-band Non-zonal Polarization Electromagnetic Metamaterial Absorber

2021 ◽  
Vol 36 (6) ◽  
pp. 697-706
Author(s):  
Han Wu ◽  
Shijun Ji ◽  
Ji Zhao ◽  
Zhiyou Luo ◽  
Handa Dai
Keyword(s):  
Structural Parameters ◽  
Surface Current ◽  
Metamaterial Absorber ◽  
Copper Plate ◽  
Polarization Angle ◽  
Absorption Mechanism ◽  
Imaging Detector ◽  
Polarization Insensitive ◽  
Spectrum Imaging ◽  
Triple Band

A facile design of a novel triple-band electromagnetic metamaterial absorber (MMA) with polarization insensitive property is proposed in this paper. Each unit of the MMA consists of upper copper resonator and bottom copper plate with middle dielectric FR-4 between them. The MMA performs three absorption peaks at 16.919 GHz, 21.084 GHz and 25.266 GHz with absorption rates 99.90%, 97.76% and 99.18%, respectively. The influence of the main structural parameters on the frequencies and absorption rates is analyzed. The absorption mechanism of the absorber is explained by electric field, magnetic field and surface current distributions, which is supported by the electromagnetic parameters, affected with magnetic resonance. The polarization-insensitivity of TE wave is verified by observing the effects of the polarization angle change from 0-90º. The MMA can be applied in radiation, spectrum imaging detector, electromagnetic wave modulator, and so on.

Multi-band polarization insensitive metamaterial absorber with dual cross-wires structure

2015 ◽  
Vol 11 (6) ◽  
pp. 414-417 ◽  
Author(s):  
Li-fang Yao ◽  
Min-hua Li ◽  
Xiao-min Zhai ◽  
Hui-bo Wang ◽  
Jian-feng Dong
Keyword(s):  
Metamaterial Absorber ◽  
Polarization Insensitive ◽  
Multi Band

Polarization-insensitive multi-band metamaterial absorber operating in the 5G spectrum

Optik ◽  
2020 ◽  
Vol 216 ◽  
pp. 164958 ◽  
Author(s):  
R.M.H. Bilal ◽  
M.A. Baqir ◽  
P.K. Choudhury ◽  
M.M. Ali ◽  
A.A. Rahim ◽  
...  
Keyword(s):  
Metamaterial Absorber ◽  
Polarization Insensitive ◽  
Multi Band

scholarly journals Experimental Verification of a TH\(\text{z}\) Multi-band Metamaterial Absorber

2020 ◽  
Vol 30 (4) ◽  
pp. 311
Author(s):  
Van Huynh Tran ◽  
Thanh Tung Nguyen ◽  
Xuan Khuyen Bui ◽  
Dinh Lam Vu ◽  
Son Tung Bui ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Experimental Verification ◽  
Metamaterial Absorber ◽  
Fourier Transformed Infrared Spectroscopy ◽  
Dielectric Spacer ◽  
Wide Range ◽  
Band Absorption ◽  
Absorption Performance ◽  
Metamaterial Absorbers ◽  
Multi Band

Multi-band metamaterial absorbers have been of great interest owing to their potentials for a wide range of communicating, sensing, imaging, and energy harvesting applications. In this work, we experimentally investigate a four-band metamaterial absorber operating at THz frequencies. The metamaterials are fabricated using the maskless UV photolithography and e-beam evaporation techniques. The absorption spectra of the proposed absorber are measured using the micro-Fourier transformed infrared spectroscopy. It was demonstrated that multi-band absorption behavior originates from different individual metamaterial resonators. The thickness of the dielectric spacer plays a key role in optimizing the absorption performance, in line with the predicted results on single-band THz absorbers.

scholarly journals Ultrathin polarization-insensitive tri-band THz perfect metamaterial absorber

2020 ◽  
Vol 7 ◽  
pp. 2
Author(s):  
Zhaomei Liu ◽  
Xingxing Han ◽  
Aixia Wang
Keyword(s):  
Cell Structure ◽  
Metamaterial Absorber ◽  
Q Factor ◽  
Simulated Spectrum ◽  
Thz Imaging ◽  
Potential Applications ◽  
Polarization Insensitive ◽  
Perfect Metamaterial Absorber ◽  
Sandwiched Structure ◽  
Patch Resonators

In this paper, an ultrathin and polarization-insensitive THz perfect metamaterial absorber (PMA) was proposed using the traditional sandwiched structure with circular patch resonators on the top layer. The simulated spectrum shows that the proposed PMA has three distinctive absorption peaks at f1 = 0.8 THz, f2 = 2.28 THz and f3 = 3.62 THz, with absorbance of 96.7%, 97.9% and 99.8%, respectively. The electric field distributions of the PMA reveal that the absorption mainly originates from the standing wave resonances between the top and bottom layers. The proposed PMA is polarization insensitive due to its axisymmetric unit cell structure. By adjusting the structure parameters, the resonance frequency, intensity and Q-factor of absorption peak can be tuned effectively. Our design may find potential applications in THz imaging, sensing and signal detection.

A Simple Multi-band Metamaterial Absorber with Combined Polarization Sensitive and Polarization Insensitive Characteristics for Terahertz Applications

Plasmonics ◽  
2018 ◽  
Vol 14 (3) ◽  
pp. 737-742 ◽  
Author(s):  
Bhargav Appasani ◽  
Pallav Prince ◽  
Rajeev Kumar Ranjan ◽  
Nisha Gupta ◽  
Vijay Kumar Verma
Keyword(s):  
Metamaterial Absorber ◽  
Terahertz Applications ◽  
Polarization Insensitive ◽  
Multi Band

scholarly journals Highly Transparent Broadband and Polarization-Insensitive Absorber Based on Metasurface

2020 ◽  
Vol 10 (24) ◽  
pp. 9125
Author(s):  
Houdi Xiao ◽  
Ruiru Qin ◽  
Mingyun Lv ◽  
Chuanzhi Wang
Keyword(s):  
Incidence Angle ◽  
Wide Band ◽  
Metamaterial Absorber ◽  
Light Transmittance ◽  
Cutoff Wavelength ◽  
Broadband Absorption ◽  
Low Profile ◽  
Wide Range ◽  
Potential Applications ◽  
Polarization Insensitive

A highly transparent polarization-insensitive metamaterial absorber with wideband microwave absorption is presented. The broadband absorption (6.0~16.7 GHz, absorptance > 85%) is achieved using three patterned resistive metasurfaces. The visible light transmittance of the absorber is as high as 85.7%. The thickness of the absorber is 4.42 mm, which is only 0.088 times of the upper-cutoff wavelength. A prototype sample is fabricated and measured to demonstrate its excellent performance. The experimental results agree well with the simulation results. In view of its wide band absorption, high transmittance, low profile, polarization insensitivity and wide incidence angle stability, the presented absorber has a wide range of potential applications.

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