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.

scholarly journals Comment on “Dual-Band Perfect Metamaterial Absorber Based on an Asymmetric H-Shaped Structure for Terahertz Waves [Materials] (2018) [2193; https://doi.org/10.3390/ma11112193]”

Materials ◽  
2019 ◽  
Vol 12 (23) ◽  
pp. 3914
Author(s):  
Fahad Ahmed ◽  
Afzal Ahmed ◽  
Tania Tamoor ◽  
Tayyab Hassan
Keyword(s):  
Metamaterial Absorber ◽  
Dual Band ◽  
Terahertz Waves ◽  
Perfect Metamaterial Absorber

In a recent publication, Lu et al [...]

A wide-angle polarization-sensitive dual-band absorber with a grating structure

2014 ◽  
Vol 92 (3) ◽  
pp. 191-193 ◽  
Author(s):  
Yan-Lin Liao ◽  
Yan Zhao
Keyword(s):  
Dielectric Layer ◽  
Polarized Light ◽  
Unit Cell ◽  
Dual Band ◽  
Wide Angle ◽  
Metal Structures ◽  
Grating Structure ◽  
Potential Applications ◽  
Band Absorption ◽  
Simulation Results

We report a wide-angle polarization-sensitive dual-band absorber with a grating structure. The unit cell is made of two metal–dielectric–metal structures with different dielectric-layer thicknesses. The simulation results show that the dual-band absorption peaks for TM polarization can be tuned by varying the thickness of the dielectric layer. Also, the dual-band absorption magnitudes are more than 0.9 for both absorption peaks for angles up to 60°. At the same time, TE-polarized light has been reflected effectively in the visible and infrared regimes. Our results may have potential applications in polarization detectors and reflective polarizers.

scholarly journals Ultrathin Terahertz Dual-Band Perfect Metamaterial Absorber Using Asymmetric Double-Split Rings Resonator

Symmetry ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 293 ◽  
Author(s):  
Taiguo Lu ◽  
Dawei Zhang ◽  
Peizhen Qiu ◽  
Jiqing Lian ◽  
Ming Jing ◽  
...  
Keyword(s):  
Electric Field ◽  
Metal Layer ◽  
Metamaterial Absorber ◽  
Dual Band ◽  
Asymmetric Distribution ◽  
Absorption Frequency ◽  
Terahertz Band ◽  
Perfect Metamaterial Absorber ◽  
Simulation Results ◽  
Continuous Metal

In this article, an ultrathin terahertz dual band metamaterial absorber made up of patterned asymmetrical double-split rings and a continuous metal layer separated by a thin FR-4 layer is designed. Simulation results show that two almost identical strong absorption peaks appear in the terahertz band. When the incident electric field is perpendicular to the ring gaps located at 11 μm asymmetrically, the absorptivity of 98.6% at 4.48 THz and 98.5% at 4.76 THz can be obtained. The absorption frequency and the absorptivity of the absorber can be modulated by the asymmetric distribution of the gaps. The perfect metamaterial absorber is expected to provide important reference for the design of terahertz modulator, filters, absorbers, and polarizers.

scholarly journals Dual-band tunable perfect metamaterial absorber in the THz range

2016 ◽  
Vol 24 (2) ◽  
pp. 1518 ◽  
Author(s):  
Gang Yao ◽  
Furi Ling ◽  
Jin Yue ◽  
Chunya Luo ◽  
Jie Ji ◽  
...  
Keyword(s):  
Metamaterial Absorber ◽  
Dual Band ◽  
Perfect Metamaterial Absorber ◽  
Thz Range

Design of Polarization- and Incident Angle-Independent Perfect Metamaterial Absorber with Interference Theory

2014 ◽  
Vol 43 (11) ◽  
pp. 3949-3953 ◽  
Author(s):  
Furkan Dincer ◽  
Muharrem Karaaslan ◽  
Emin Unal ◽  
Oguzhan Akgol ◽  
Cumali Sabah
Keyword(s):  
Incident Angle ◽  
Metamaterial Absorber ◽  
Interference Theory ◽  
Perfect Metamaterial Absorber

Strong absorption of solar energy by using wide band metamaterial absorber designed with plus-shaped resonators

2018 ◽  
Vol 32 (25) ◽  
pp. 1850275 ◽  
Author(s):  
Emin Ünal ◽  
Mehmet Bağmancı ◽  
Muharrem Karaaslan ◽  
Oguzhan Akgol ◽  
Cumali Sabah
Keyword(s):  
Frequency Band ◽  
Metal Layer ◽  
Wide Band ◽  
Metamaterial Absorber ◽  
Dual Band ◽  
Polarization Angle ◽  
Perfect Absorption ◽  
Tem Mode ◽  
Potential Applications ◽  
Absorption Level

A new metamaterial absorber (MA) having distinct properties than those given in the literature is investigated. Although several designs have been studied for achieving absorption characteristics in single-band, dual-band and multiple bands within the whole spectrum of solar light, there has been limited number of researches examining the broadband MA in the visible light section of the spectrum. The designed structure is composed of the combination of three layers having different thicknesses including a metallic substrate, dielectric and a metal layer. Due to the sandwich-like structure, it can support the plasmonic resonance. The proposed structure, which provides a maximum absorption level of 99.42% at 579.26 THz, has a high absorption rate of 99% between the frequency band 545 and 628 THz. Numerical results indicate that the proposed structure has perfect absorption which is greater than 90.98% through the whole working frequency band. The dependency of the designed structure on the polarization angle is investigated for different incident angles with TE and TM polarizations as well as the TEM mode. In addition to its potential applications such as solar cells and cloaking, the designed structure can also be considered as a color sensor and an optical frequency sensor.

scholarly journals Two-layered Dual-band Perfect Metamaterial Absorber at K band Frequency

2018 ◽  
Vol 7 (2) ◽  
pp. 25-27
Author(s):  
M. C. Tran ◽  
T. T. H. Phuong
Keyword(s):  
Metamaterial Absorber ◽  
Dual Band ◽  
Material Structure ◽  
Perfect Absorption ◽  
Band Frequency ◽  
Absorption Frequency ◽  
Dielectric Layers ◽  
Absorber Structure ◽  
Perfect Metamaterial Absorber ◽  
K Band

This paper presents a study of a novel absorber structure based on two-dielectric-layers, two perfect absorption frequency bands at K band (f1 = 26.5 GHz and f2 = 28.6 GHz) go under observance. The study of the dependence of absorption and frequency on relative distance between the layers of material and the material structure parameters are discussed. 

scholarly journals The Study of Midinfrared Extremely Narrow Dual-Band Absorber Based on a Novel Metamaterial Structure

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Zichun Li ◽  
Jinhua Li ◽  
Ye Zhang ◽  
Yingjiao Zhai ◽  
Xueying Chu ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Metamaterial Absorber ◽  
Dual Band ◽  
Metamaterial Structure ◽  
Refractive Index Sensitivity ◽  
Perfect Absorption ◽  
Metal Pattern ◽  
Pattern Layer ◽  
Index Sensitivity ◽  
20 Nm

Due to the problems that the metal pattern layer on the top of the traditional metamaterial structure is easy to be oxidized and easy to fall off, in this paper, a novel semiconductor metamaterial nanostructure composed of a periodic array of GaAs-SiO2 cubes and a gold (Au) film has been proposed. Using FDTD solutions software to prove this metamaterial structure can achieve ultranarrow dual-band, nearly perfect absorption with a maximum absorbance of 99% and a full-width at half-maximum (FWHM) value that is less than 20 nm in the midinfrared region. The refractive index sensitivity is demonstrated by changing the background index and analyzing the absorption performance. It had been proved that this absorber has high sensitivity (2000/RIU and 1300/RIU). Using semiconductor material instead of the metal material of the top pattern layer can effectively inhibit the performance failure of the metamaterial structure caused by metal oxidation. The proposed narrow, dual-band metamaterial absorber shows promising prospects in applications such as infrared detection and imaging.

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