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 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 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 Design and Fabrication of a Triple-Band Terahertz Metamaterial Absorber

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1110
Author(s):  
Jinfeng Wang ◽  
Tingting Lang ◽  
Zhi Hong ◽  
Meiyu Xiao ◽  
Jing Yu
Keyword(s):  
Optical Communication ◽  
Transverse Magnetic ◽  
Metamaterial Absorber ◽  
Absorption Mechanism ◽  
Symmetric Configuration ◽  
Electric And Magnetic Fields ◽  
Polarization Insensitive ◽  
Band Absorption ◽  
High Absorption ◽  
Triple Band

We presented and manufactured a triple-band terahertz (THz) metamaterial absorber with three concentric square ring metallic resonators, a polyethylene terephthalate (PET) layer, and a metallic substrate. The simulation results demonstrate that the absorptivity of 99.5%, 86.4%, and 98.4% can be achieved at resonant frequency of 0.337, 0.496, and 0.718 THz, respectively. The experimental results show three distinct absorption peaks at 0.366, 0.512, and 0.751 THz, which is mostly agreement with the simulation. We analyzed the absorption mechanism from the distribution of electric and magnetic fields. The sensitivity of the three peaks of this triple-band absorber to the surrounding is 72, 103.5, 139.5 GHz/RIU, respectively. In addition, the absorber is polarization insensitive because of the symmetric configuration. The absorber can simultaneously exhibit high absorption effect at incident angles up to 60° for transverse electric (TE) polarization and 70° for transverse magnetic (TM) polarization. This presented terahertz metamaterial absorber with a triple-band absorption and easy fabrication can find important applications in biological sensing, THz imaging, filter and optical communication.

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

scholarly journals Tunable phase change polaritonic perfect absorber in the mid-infrared region

2020 ◽  
Vol 28 (8) ◽  
pp. 11721 ◽  
Author(s):  
Chuanyan Peng ◽  
Kai Ou ◽  
Guanhai Li ◽  
Xiaoyan Li ◽  
Wenjuan Wang ◽  
...  
Keyword(s):  
Phase Change ◽  
Infrared Region ◽  
Perfect Absorber ◽  
Mid Infrared

Tunable doublet lens based on dielectric metasurface using phase-change material

2020 ◽  
Vol 34 (28) ◽  
pp. 2050313
Author(s):  
Xingyi Li ◽  
Siqi Li ◽  
Guoxi Wang ◽  
Yufang Lei ◽  
Yunfan Hong ◽  
...  
Keyword(s):  
Phase Change ◽  
Phase Change Materials ◽  
Focal Length ◽  
Infrared Region ◽  
Optical Components ◽  
Mid Infrared ◽  
Infrared Wavelength ◽  
Active Devices ◽  
Coupling System ◽  
Wide Range

Metasurfaces have recently emerged to realize flat optical components with various functions and providing potential capabilities in manufacturing active devices. In this paper, a doublet lens for mid-infrared wavelength with tunable focal length has been proposed. The designed metalens consists of two dielectric metalenses with different focal lengths patterned on a phase-change materials Ge2Sb1Te4. The doublet lens is proved to have above 13% change in the focal length with the crystalline states shifting of the Ge2Sb1Te4. And the designed doublet lens can be operated in mid-infrared region from 2.41 [Formula: see text]m to 2.60 [Formula: see text]m. In addition, chromatic calibration can be achieved by adjusting the crystalline phases of the Ge2Sb1Te4. This compatible metalens promises potential for a wide range of applications in MIR region such as multi-spectrum imaging, optical coupling system and micrography.

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