scholarly journals Metamaterial absorber with controllable absorption wavelength and absorption efficiency

2021 ◽  
Vol 70 (2) ◽  
pp. 027804-027804
Author(s):  
Jiang Xiao-Wei ◽  
◽  
Wu Hua ◽  
◽  
Keyword(s):  
Metamaterial Absorber ◽  
Absorption Efficiency ◽  
Absorption Wavelength

scholarly journals Broadband Solar Absorber Based on Square Ring cross Arrays of ZnS

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 909
Author(s):  
Feng Xu ◽  
Lixia Lin ◽  
Jun Fang ◽  
Mianli Huang ◽  
Feng Wang ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Visible Light ◽  
Surface Plasmon ◽  
Wide Spectrum ◽  
Clean Energy ◽  
Metamaterial Absorber ◽  
Absorption Efficiency ◽  
Plasmon Mode ◽  
Solar Absorber ◽  
Absorbing Material

Solar energy is an inexhaustible clean energy. However, how to improve the absorption efficiency in the visible band is a long-term problem for researchers. Therefore, an electromagnetic wave absorber with an ultra-long absorption spectrum has been widely considered by researchers of optoelectronic materials. A kind of absorbing material based on ZnS material is presented in this paper. Our purpose is for the absorber to achieve a good and wide spectrum of visible light absorption performance. In the wide spectrum band (553.0 THz–793.0 THz) of the absorption spectrum, the average absorption rate of the absorber is above 94%. Using surface plasmon resonance (SPR) and gap surface plasmon mode, the metamaterial absorber was studied in visible light. In particular, the absorber is insensitive to both electric and magnetic absorption. The absorber can operate in complex electromagnetic environments and at high temperatures. This is because the absorber is made of refractory metals. Finally, we discuss and analyze the influence of the parameters regulating the absorber on the absorber absorption efficiency. We have tried to explain why the absorber can produce wideband absorption.

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.

scholarly journals Optical transparent infrared high absorption metamaterial absorbers

2018 ◽  
Vol 08 (01) ◽  
pp. 1850007 ◽  
Author(s):  
Jingfan Yang ◽  
Cuilian Xu ◽  
Shaobo Qu ◽  
Hua Ma ◽  
Jiafu Wang ◽  
...  
Keyword(s):  
Indium Tin Oxide ◽  
Incident Angle ◽  
Visible Region ◽  
Equivalent Circuit Model ◽  
Infrared Region ◽  
Metamaterial Absorber ◽  
Absorption Efficiency ◽  
Mechanism Analysis ◽  
Metamaterial Absorbers ◽  
High Absorption

In this work, an optical transparent infrared high absorption metamaterial absorber is proposed based on indium tin oxide (ITO) substrate. Due to the fact that ITO holds high reflectivity property in infrared region while transparent in optical region, ITO can be used in the application of Surface Plasmon Polaritons. In this design, three kinds of infrared metamaterial absorbers were proposed. All of them can achieve high absorption at 10.6[Formula: see text][Formula: see text]m while remaining transparent in visible region. LC equivalent circuit model was served as design foundation. The infrared absorption efficiency was numerically calculated and the mechanism analysis is given in the paper. The simulation results show that all three structures can achieve high absorption efficiency at 10.6[Formula: see text][Formula: see text]m under TE/TM polarization. The absorption remains high when the incident angle is less than 70[Formula: see text]. Experimental results exhibit good accordance with simulation.

scholarly journals Dynamically Switchable Polarization-Independent Triple-Band Perfect Metamaterial Absorber Using a Phase-Change Material in the Mid-Infrared (MIR) Region

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 548
Author(s):  
Dongdong Xu ◽  
Fenping Cui ◽  
Gaige Zheng
Keyword(s):  
Phase Change ◽  
Resonant Cavity ◽  
Infrared Region ◽  
Metamaterial Absorber ◽  
Absorption Efficiency ◽  
Plasmon Mode ◽  
Mid Infrared ◽  
Reversible Phase ◽  
High Absorption ◽  
Triple Band

A tunable metamaterial absorber (MMA) by reversible phase transitions in a mid-infrared regime is theoretically investigated. The absorber is composed of a molybdenum (Mo)-germanium-antimony-tellurium (Ge2Sb2Te5, GST)-Mo nanodisk structure superimposed on the GST-Al2O3 (aluminum oxide)-Mo film. Studies have shown that the combination of the inlaid metal-medium dielectric waveguide mode and the resonant cavity mode and the excitation of the propagating surface plasmon mode are the main reasons for the formation of the triple-band high absorption. Additionally, through the reversible phase change, the transition from high absorption to high reflection in the mid-infrared region is realized. The symmetry of the absorber eliminates the polarization dependence, and the near unity absorption efficiency can be maintained by incidence angles up to 60°. The presented method will enhance the functionality of the absorber and has the potential for the applications that require active control over light absorption.

scholarly journals Polarization insensitive metamaterial absorber based on E-shaped all-dielectric structure

2015 ◽  
Vol 05 (01) ◽  
pp. 1550009 ◽  
Author(s):  
Liyang Li ◽  
Jun Wang ◽  
Hua Ma ◽  
Jiafu Wang ◽  
Hongliang Du ◽  
...  
Keyword(s):  
Frequency Band ◽  
Research Work ◽  
Microwave Frequency ◽  
Metamaterial Absorber ◽  
Absorption Efficiency ◽  
Dielectric Structure ◽  
Microwave Ceramics ◽  
Low Loss ◽  
Resonant Modes ◽  
Polarization Insensitive

In this paper, we designed a metamaterial absorber performed in microwave frequency band. This absorber is composed of E-shaped dielectrics which are arranged along different directions. The E-shaped all-dielectric structure is made of microwave ceramics with high permittivity and low loss. Within about 1 GHz frequency band, more than 86% absorption efficiency was observed for this metamaterial absorber. This absorber is polarization insensitive and is stable for incident angles. It is figured out that the polarization insensitive absorption is caused by the nearly located varied resonant modes which are excited by the E-shaped all-dielectric resonators with the same size but in the different direction. The E-shaped dielectric absorber contains intensive resonant points. Our research work paves a way for designing all-dielectric absorber.

scholarly journals Improving the mid-infrared energy absorption efficiency by using a dual-band metamaterial absorber

2014 ◽  
Vol 24 (2) ◽  
pp. 128-133 ◽  
Author(s):  
Nan Zhang ◽  
Peiheng Zhou ◽  
Shifeng Zou ◽  
Xiaolong Weng ◽  
Jianliang Xie ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Metamaterial Absorber ◽  
Absorption Efficiency ◽  
Dual Band ◽  
Mid Infrared ◽  
Energy Absorption Efficiency

Single-peak-regulation and wide-angle dual-band metamaterial absorber based on hollow-cross and solid-cross resonators

2020 ◽  
Vol 91 (3) ◽  
pp. 30901
Author(s):  
Yibo Tang ◽  
Longhui He ◽  
Jianming Xu ◽  
Hailang He ◽  
Yuhan Li ◽  
...  
Keyword(s):  
Transverse Electric ◽  
Surface Current ◽  
Dielectric Substrate ◽  
Transverse Magnetic ◽  
Metamaterial Absorber ◽  
Absorption Peak ◽  
Dual Band ◽  
Single Peak ◽  
Wide Angle ◽  
Surface Current Density

A dual-band microwave metamaterial absorber with single-peak regulation and wide-angle absorption has been proposed and illustrated. The designed metamaterial absorber is consisted of hollow-cross resonators, solid-cross resonators, dielectric substrate and metallic background plane. Strong absorption peak coefficients of 99.92% and 99.55% are achieved at 8.42 and 11.31 GHz, respectively, which is basically consistent with the experimental results. Surface current density and changing material properties are employed to illustrate the absorptive mechanism. More importantly, the proposed dual-band metamaterial absorber has the adjustable property of single absorption peak and could operate well at wide incidence angles for both transverse electric (TE) and transverse magnetic (TM) waves. Research results could provide and enrich instructive guidances for realizing a single-peak-regulation and wide-angle dual-band metamaterial absorber.

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