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.

Investigation of a broadband and polarization-insensitive optical absorber based on closed-ring resonator

2016 ◽  
Vol 25 (03) ◽  
pp. 1650032 ◽  
Author(s):  
Dan Hu ◽  
Hong-Yan Wang ◽  
Qiao-Fen Zhu ◽  
Xi-Wei Zhang ◽  
Zhen-Jie Tang
Keyword(s):  
Ring Resonator ◽  
Metamaterial Absorber ◽  
Broadband Absorption ◽  
Solar Energy Harvesting ◽  
Closed Ring ◽  
Visible Wavelength Range ◽  
Potential Applications ◽  
Polarization Insensitive ◽  
Sandwiched Structure ◽  
Compact Design

A broadband and polarization-insensitive optical metamaterial absorber (MA) based on the refractory metal chromium (Cr) closed-ring resonator is theoretically investigated. The semiconducting silicon dioxide (SiO[Formula: see text] thin film is introduced as the space layer in this sandwiched structure. Utilizing the symmetrical geometry of the proposed MA structure, polarization insensitivity of the broadband absorption is gained. The simulation results show that the absorber with Cr closed-ring array obtains an average absorption of 99.25% from 400[Formula: see text]nm to 900[Formula: see text]nm, covering the total visible wavelength range. This compact design may have potential applications in solar energy harvesting, thermal imaging, and emissivity control.

scholarly journals Efficient Broadband Truncated-Pyramid-Based Metamaterial Absorber in the Visible and Near-Infrared Regions

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 784 ◽  
Author(s):  
Phuc Toan Dang ◽  
Tuan V. Vu ◽  
Jongyoon Kim ◽  
Jimin Park ◽  
Van-Chuc Nguyen ◽  
...  
Keyword(s):  
Communication Systems ◽  
Near Infrared ◽  
Cell Structure ◽  
Single Layer ◽  
Normal Incidence ◽  
Transverse Magnetic ◽  
Metamaterial Absorber ◽  
Broadband Absorption ◽  
Polarization Insensitive ◽  
Truncated Pyramid

We present a design of an ultra-broadband metamaterial absorber in the visible and near- infrared regions. The unit cell structure consists of a single layer of metallic truncated-pyramid resonator-dielectric-metal configuration, which results in a high absorption over a broad wavelength range. The absorber exhibits 98% absorption at normal incidence spanning a wideband range of 417–1091 nm, with >99% absorption within 822–1054 nm. The broadband absorption stability maintains 95% at large incident angles up to 40° for the transverse electric (TE)-mode and 20° for the transverse magnetic (TM)-mode. Furthermore, the polarization-insensitive broadband absorption is presented in this paper by analyzing absorption performance with various polarization angles. The proposed absorber can be applied for applications such as solar cells, infrared detection, and communication systems thanks to the convenient and compatible bandwidth for electronic THz sources.

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.

Multi-band polarization independent cylindrical metamaterial absorber and sensor application

2016 ◽  
Vol 30 (08) ◽  
pp. 1650095 ◽  
Author(s):  
Furkan Dincer ◽  
Muharrem Karaaslan ◽  
Sule Colak ◽  
Erkan Tetik ◽  
Oguzhan Akgol ◽  
...  
Keyword(s):  
Rotational Symmetry ◽  
Microwave Frequency ◽  
Defense Industry ◽  
Metamaterial Absorber ◽  
Numerical Studies ◽  
Proposed Model ◽  
Potential Applications ◽  
Frequency Regime ◽  
Perfect Metamaterial Absorber ◽  
Multi Band

A multi-band perfect metamaterial absorber (MA) based on a cylindrical waveguide with polarization independency is numerically presented and investigated in detail. The proposed absorber has a very simple configuration, and it operates at flexible frequency ranges within the microwave frequency regime by simply tuning the dimensions of the structure. The maximum absorption values are obtained as 99.9%, 97.5%, 85.8%, 68.2% and 40.2% at the frequencies of 1.34 GHz, 2.15 GHz, 3.2 GHz, 4.31 GHz and 5.41 GHz, respectively. The numerical studies verify that the proposed model can provide multi-band perfect absorptions at wide polarization and incident angles due to its rotational symmetry feature. We have also realized sensor and parametric study applications in order to show additional features of the suggested model. The suggested MA enables myriad potential applications in medical technologies, sensors and in defense industry etc.

scholarly journals A wide-angle and TE/TM polarization-insensitive terahertz metamaterial near-perfect absorber based on multi-layer plasmonic structure

2021 ◽  
Author(s):  
Yuanbo Sun ◽  
Yanpeng Shi ◽  
Xiaoyu Liu ◽  
Jinmei Song ◽  
Meiping Li ◽  
...  
Keyword(s):  
Design Method ◽  
Metamaterial Absorber ◽  
Perfect Absorber ◽  
Wide Angle ◽  
Flexible Design ◽  
Plasmonic Structure ◽  
Terahertz Band ◽  
Polarization Insensitive ◽  
Perfect Metamaterial Absorber

A kind of near-perfect metamaterial absorber, made of only Au and Si, has been presented in the terahertz band with extremely high absorptance. A flexible design method is proposed, which...

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.

scholarly journals Design of the ultra-thin perfect metamaterial absorber with high Q-factor

2013 ◽  
Vol 62 (24) ◽  
pp. 244101
Author(s):  
Li Si-Jia ◽  
Cao Xiang-Yu ◽  
Gao Jun ◽  
Zheng Qiu-Rong ◽  
Yang Qun ◽  
...  
Keyword(s):  
Metamaterial Absorber ◽  
Q Factor ◽  
High Q ◽  
Perfect Metamaterial Absorber

scholarly journals Ultrathin and Optically Transparent Microwave Absorber Based on Flexible Silver Nanowire Film

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1583
Author(s):  
Yanfei Dong ◽  
Dingwang Yu ◽  
Guochao Li ◽  
Yulin Cao ◽  
Youde Ruan ◽  
...  
Keyword(s):  
Physical Mechanism ◽  
Equivalent Circuit Model ◽  
Optical Transmittance ◽  
Metamaterial Absorber ◽  
Silver Nanowire ◽  
Wide Angle ◽  
Optically Transparent ◽  
Potential Applications ◽  
Sandwiched Structure ◽  
Angle Property

The design of an optically transparent and flexible metamaterial absorber was presented and fabricated. For this purpose, we use two different patterned silver nanowire films separated by the space layer, forming a transparent sandwiched structure with an ultrathin thickness. By analyzing the equivalent circuit model and distribution of electric field and current, the absorption physical mechanism has been theoretically investigated. The results show that the structure can achieve above 0.8 absorptions from 6 GHz to 18 GHz, and at the same time, this absorber also can obtain wide-angle property. The optical transmittance of the fabricated absorber exceeds 82% in the visible band. The results demonstrate that transparency and flexibility are the additional benefits that make the proposed absorber suitable for various potential applications.

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