A terahertz metamaterial absorbers with wide absorption bandwidth

2019 ◽  
Author(s):  
Zihui Liu ◽  
Tong Wu ◽  
Yachen Gao ◽  
Yang Gao
Keyword(s):  
Absorption Bandwidth ◽  
Metamaterial Absorbers

scholarly journals Damage analysis of a perfect broadband absorber by a femtosecond laser

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ahasanul Haque ◽  
Monir Morshed ◽  
Ziyuan Li ◽  
Li Li ◽  
Kaushal Vora ◽  
...  
Keyword(s):  
Optical Properties ◽  
Solar Cells ◽  
Femtosecond Laser ◽  
Metamaterial Absorber ◽  
Damage Analysis ◽  
Broadband Absorber ◽  
Absorption Bandwidth ◽  
Refractory Ceramic ◽  
Tungsten Boride ◽  
Metamaterial Absorbers

Abstract Plasmonic metamaterial absorbers are particularly important in different applications such as photodetectors, microbolometers and solar cells. In this paper, we propose a tungsten boride (WB, a refractory ceramic) based broadband metamaterial absorber whose optical properties is numerically analyzed and experimentally characterized. We have also analyzed the damage characteristics of this absorber using a femtosecond laser and compared with an ordinary Au metamaterial absorber. We observe that WB has almost the double absorption bandwidth with absorption more than 90% over the spectral range of 950 to 1400 nm when compared with the Au counterpart. Furthermore, we show that Au metamaterial is damaged at the power of around 36.4 mW whereas WB metamaterial is not damaged at that power (WB has high Tammann temperature than Au)-however the atom of WB material was knocked off by the bombardment of a femtosecond laser.

scholarly journals A Ultra-broadband Thin Metamaterial Absorber for Ku and K Bands Applications

2021 ◽  
Vol 27 (5) ◽  
pp. 1-16
Author(s):  
Hema Omer Ali ◽  
Asaad M. Al-Hindawi
Keyword(s):  
Input Impedance ◽  
Surface Current ◽  
Metamaterial Absorber ◽  
Frequency Range ◽  
Wide Bandwidth ◽  
Absorption Bandwidth ◽  
Unit Cell Size ◽  
Working Principle ◽  
Radar Applications ◽  
Metamaterial Absorbers

In this paper, a design of the broadband thin metamaterial absorber (MMA) is presented. Compared with the previously reported metamaterial absorbers, the proposed structure provides a wide bandwidth with a compatible overall size. The designed absorber consists of a combination of octagon disk and split octagon resonator to provide a wide bandwidth over the Ku and K bands' frequency range. Cheap FR-4 material is chosen to be a substate of the proposed absorber with 1.6 thicknesses and 6.5×6.5 overall unit cell size. CST Studio Suite was used for the simulation of the proposed absorber. The proposed absorber provides a wide absorption bandwidth of 14.4 GHz over a frequency range of 12.8-27.5 GHz with more than %90 absorptions. To analyze the proposed design, electromagnetic parameters such as permittivity  permeability  reflective index , and impedance  were extracted and presented. The structure's working principle is analyzed and illustrated through input impedance, surface current, and the electric field of the structure. The proposed absorber compared with the recent MMA presented in the literature. The obtained results indicated that the proposed absorber has the widest bandwidth with the highest absorption value. According to these results, the proposed metamaterials absorber is a good candidate for RADAR applications.

scholarly journals Broadband microwave metamaterial absorber with lumped resistor loading

2019 ◽  
Vol 6 ◽  
pp. 1 ◽  
Author(s):  
Ke Chen ◽  
Xinyao Luo ◽  
Guowen Ding ◽  
Junming Zhao ◽  
Yijun Feng ◽  
...  
Keyword(s):  
Electromagnetic Compatibility ◽  
Design Principle ◽  
Transverse Electric ◽  
Transverse Magnetic ◽  
Metamaterial Absorber ◽  
Absorption Bandwidth ◽  
Practical Applications ◽  
Angular Performance ◽  
Polarization Insensitive ◽  
Metamaterial Absorbers

Narrow absorption bandwidth has been a fundamental drawback hindering many metamaterial absorbers for practical applications. In this paper, by loading lumped resistors, we have successfully designed a microwave metamaterial absorber with multioctave wide absorption bandwidth covering the entire X- and Ku-bands, while keeping the thickness of the absorber less than 1/10 of the working wavelength. The polarization-insensitive absorber shows a good angular stability for both transverse electric (TE) and transverse magnetic (TM) incidences. Prototype has been fabricated and measured to validate the design principle and the simulated results, and good agreements are observed between simulated and measured results. The proposed metamaterial absorber offers an efficient way to realize broadband microwave absorption with stable angular performance, which may find potential uses in many applications, for example, electromagnetic compatibility.

scholarly journals Ultra-broadband metamaterial absorbers from long to very long infrared regime

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Yu Zhou ◽  
Zheng Qin ◽  
Zhongzhu Liang ◽  
Dejia Meng ◽  
Haiyang Xu ◽  
...  
Keyword(s):  
Surface Plasmon Resonances ◽  
Absorption Bandwidth ◽  
Broadband Absorption ◽  
Intrinsic Absorption ◽  
Thermal Emitters ◽  
Plasmon Resonances ◽  
Potential Applications ◽  
Metamaterial Absorbers ◽  
Lossy Material ◽  
High Absorption

AbstractBroadband metamaterials absorbers with high absorption, ultrathin thickness and easy configurations are in great demand for many potential applications. In this paper, we first analyse the coupling resonances in a Ti/Ge/Ti three-layer absorber, which can realise broadband absorption from 8 to 12 μm. Then we experimentally demonstrate two types of absorbers based on the Ti/Ge/Si3N4/Ti configuration. By taking advantage of coupling surface plasmon resonances and intrinsic absorption of lossy material Si3N4, the average absorptions of two types of absorbers achieve almost 95% from 8 to 14 μm (experiment result: 78% from 6.5 to 13.5 μm). In order to expand the absorption bandwidth, we further propose two Ti/Si/SiO2/Ti absorbers which can absorb 92% and 87% of ultra-broadband light in the 14–30 μm and 8–30 μm spectral range, respectively. Our findings establish general and systematic strategies for guiding the design of metamaterial absorbers with excellent broadband absorption and pave the way for enhancing the optical performance in applications of infrared thermal emitters, imaging and photodetectors.

scholarly journals Broadening the absorption bandwidth of metamaterial absorbers by transverse magnetic harmonics of 210 mode

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Chang Long ◽  
Sheng Yin ◽  
Wei Wang ◽  
Wei Li ◽  
Jianfei Zhu ◽  
...  
Keyword(s):  
Transverse Magnetic ◽  
Absorption Bandwidth ◽  
Metamaterial Absorbers

Fabrication of Metamaterial Absorbers in THz Region and Evaluation of the Absorption Characteristics

2016 ◽  
Vol 136 (5) ◽  
pp. 172-179
Author(s):  
Yuta Ishii ◽  
Yuma Takida ◽  
Yoshiaki Kanamori ◽  
Hiroaki Minamide ◽  
Kazuhiro Hane
Keyword(s):  
Metamaterial Absorbers ◽  
Absorption Characteristics

Applications of metamaterial sensors: a review

2021 ◽  
pp. 1-15
Author(s):  
Divya Prakash ◽  
Nisha Gupta
Keyword(s):  
Electromagnetic Interaction ◽  
High Sensitivity ◽  
Ring Resonators ◽  
Electromagnetic Properties ◽  
Physical Parameters ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Quality Testing ◽  
Properties Of Materials ◽  
Metamaterial Absorbers

Abstract Sensors based on metamaterial absorbers are very promising when it comes to high sensitivity and quality factor, cost, and ease of fabrication. The absorbers could be used to sense physical parameters such as temperature, pressure, density as well as they could be used for determining electromagnetic properties of materials and their characterization. In this work, an attempt has been made to explore the various possible applications of these sensors. Metamaterial-based sensors are very popular for its diverse applications in areas such as biomedical, chemical industry, food quality testing, agriculture. Split-ring resonators with various shapes and topologies are the most frequently used structures where the sensing principle is based on electromagnetic interaction of the material under test with the resonator. Overcoming the design challenges using metamaterial sensors involving several constraints such as cost, compactness, reusability, ease in fabrication, and robustness is also addressed.

Terahertz Microfluidic Sensor Based on Metamaterial Absorbers with Enhanced Electromagnetic Field Interaction

2021 ◽  
Vol 50 (1) ◽  
pp. 131-141
Author(s):  
陈涛 Tao CHEN ◽  
黄锋宇 Fengyu HUANG ◽  
钟鑫 Xin ZHONG ◽  
蒋未杰 Weijie JIANG ◽  
张大鹏 Dapeng ZHANG
Keyword(s):  
Electromagnetic Field ◽  
Field Interaction ◽  
Metamaterial Absorbers

Graphene supported tunable bi-directional terahertz metamaterial absorbers

2021 ◽  
Author(s):  
Jun Peng ◽  
Jin Leng ◽  
Duo Cao ◽  
Xiaoyong He ◽  
Fangting Lin ◽  
...  
Keyword(s):  
Metamaterial Absorbers
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