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Articoli di riviste sul tema "MULTIBAND METAMATERIAL ABSORBER (MMA)"

Autore: Grafiati

Pubblicato: 26 ottobre 2023

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1

Mohanty, Ayesha, Om Prakash Acharya, Bhargav Appasani, Kriangkrai Sooksood e Sushanta Kumar Mohapatra. "A THz Metamaterial Absorber with Multiple Polarization - Insensitive, Sensitive, and Tunable". ECTI Transactions on Electrical Engineering, Electronics, and Communications 19, n. 2 (1 giugno 2021): 165–73. http://dx.doi.org/10.37936/ecti-eec.2021192.242019.

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Terahertz (THz) absorbers are gaining interest in many applications. In this paper, we present the design and simulation of a multiband metamaterial absorber (MMA) with combined polarization properties and prominent absorption at 2.2 THz and 3.9 THz. The MMA comprises two square split-ring resonators and one square ring resonator placed on top of a polyimide dielectric spacer, offering multiband absorption characteristics with maximum absorptivity of 93.18% and 96.09%, respectively. The most protruding feature of this design is that it displays multiple polarization characteristics, including insensitivity, sensitivity, and tunability, even though the structure is similar to those of conventional absorbers. Firstly, the distinctly visible absorption spectra at 1.8 THz, gradually diminishes with an increase in polarization angle and then completely vanishes for TM polarization. Secondly, the prominent band at 2.2 THz is insensitive to changes in polarization of the incident wave, whereas, at 3.9 THz, the absorption band displays polarization tunability characteristics. Due to the multiple characteristics displayed by the structure, this MMA can be simultaneously used for several applications in the terahertz frequency regime such as imaging, terahertz spectroscopy, sensing, and stealth technology.

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2

Saxena, G., Y. Khanna, Y. K. Awasthi e P. Jain. "Multi-Band Polarization Insensitive Ultra-Thin THz Metamaterial Absorber for Imaging and EMI Shielding Applications". Advanced Electromagnetics 10, n. 3 (12 novembre 2021): 43–49. http://dx.doi.org/10.7716/aem.v10i3.1759.

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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.

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3

Hakim, Mohammad Lutful, Touhidul Alam, Mohammad Tariqul Islam, Mohd Hafiz Baharuddin, Ahmed Alzamil e Md Shabiul Islam. "Quad-Band Polarization-Insensitive Square Split-Ring Resonator (SSRR) with an Inner Jerusalem Cross Metamaterial Absorber for Ku- and K-Band Sensing Applications". Sensors 22, n. 12 (14 giugno 2022): 4489. http://dx.doi.org/10.3390/s22124489.

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The development of metamaterial absorbers has become attractive for various fields of application, such as sensing, detectors, wireless communication, antenna design, emitters, spatial light modulators, etc. Multiband absorbers with polarization insensitivity have drawn significant attention in microwave absorption and sensing research. In this paper, we propose a quad-band polarization-insensitive metamaterial absorber (MMA) for Ku- and K-band applications. The proposed patch comprises two square split-ring resonators (SSRR), four microstrip lines, and an inner Jerusalem cross to generate four corresponding resonances at 12.62 GHz,14.12 GHz, 17.53 GHz, and 19.91 GHz with 97%, 99.51%, 99%, and 99.5% absorption, respectively. The complex values of permittivity, permeability, refractive index, and impedance of MMA were extracted and discussed. The absorption mechanism of the designed MMA was explored by impedance matching, equivalent circuit model, as well as magnetic field and electric field analysis. The overall patch has a rotational-symmetrical structure, which plays a crucial role in acquiring the polarization-insensitive property. The design also shows stable absorption for both transverse electric (TE) and transverse magnetic (TM) modes. Its near-unity absorption and excellent sensing performance make it a potential candidate for sensing applications.

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4

Wang, Wenjie, Mingde Feng, Jun Wang, Zhiqiang Li, Jiafu Wang, Hua Ma e Shaobo Qu. "Quadruple-band metamaterial absorber based on the cuboid dielectric particles". Journal of Advanced Dielectrics 08, n. 04 (agosto 2018): 1850023. http://dx.doi.org/10.1142/s2010135x18500236.

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In this work, a quadruple-band dielectric metamaterial absorber (MMA) was proposed and studied, which is composed of eight cuboid dielectric particles and a metallic ground plate. When electromagnetic wave is incident on the dielectric particles, dielectric particles act as resonators and produce abundant resonant modes, which can result in perfect absorption. In simulation, four absorption peaks are observed at 9.13, 9.62, 10.0 and 10.46[Formula: see text]GHz with 88%, 89%, 100% and 96%, respectively. By adjusting geometry parameters of the dielectric particles, dielectric MMAs with different bands can be obtained. Further investigation shows that the absorption peaks can be changed by increasing the permittivity of the dielectric. Based on the designing technique of using simple cuboid dielectric particles directly acting as resonator, this work provides a simple method to construct multiband all-dielectric MMA.

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5

Hossain, I., M. Samsuzzaman, M. S. J. Singh, B. B. Bais e M. T. Islam. "Numerical investigation of polarization-insensitive multiband metamaterial for terahertz solar absorber". Digest Journal of Nanomaterials and Biostructures 16, n. 2 (2021): 593–600. http://dx.doi.org/10.15251/djnb.2021.162.593.

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This study presents a nanostructured multiband metamaterial absorber for the optical regime application. The proposed structure is exhibited 0° to 90° polarization insensitivity and up to 45° angular stability with more than 90% peak absorption in between 300 THz800 THz frequency range. Proposed MMA structure is acquired perfect absorption of 99.99% at 571THz, 99.50% at 488.26 THz, 99.32% at 598 THz frequency by adjusting geometrical parameters. Due to perfect impedance matching with plasmonic resonance characteristics, these structures achieved an average absorption of 95.30%, 91.96%, 97.25%, 97.65%, 91%,90%,90.23% in between (337.5 THz-346.5 THz), (471 THz-478 THz), (497.5 THz-505 THz), (519 THz-530.5 THz), 564.5 THz-577 THz), (604 THz-673 THz), (686 THz-708 THz), respectively. The near field pattern of proposed MMA is used to explain the absorption mechanism at resonance frequency point and the geometric parameters are explored and analyzed to demonstrate the performance of the proposed structure. Moreover, CST-HFSS interference is validated the simulation data with the help of the finite element method (FEM). Polarization insensitivity and wide angular stability in terahertz (THz) frequency regime make this structure suitable for the application of magnetic resonance imaging (MRI), color images, thermal imaging and solar cell applications like exploitation of solar energy.

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6

Wu, Han, Shijun Ji, Ji Zhao, Chengxin Jiang e Handa Dai. "Design and Analysis of a Five-Band Polarization-Insensitive Metamaterial Absorber". International Journal of Antennas and Propagation 2020 (7 dicembre 2020): 1–12. http://dx.doi.org/10.1155/2020/8827517.

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A five-band metamaterial absorber (MMA) is presented. The proposed absorber consists of a three-layer structure of the top metal resonator, intermediate dielectric layer, and bottom metal plane. The top structure takes the centroid as the center and spreads out in a three-pronged shape with an average of 360°, and the ends bifurcate again. The calculation was carried out by the professional software to iteratively optimize the absorption effect of MMA in the microwave range. The results show that the MA has five peaks at resonant frequencies of 5.984 GHz, 12.232 GHz, 18.128 GHz, 18.414 GHz, and 20.592 GHz, with peaks of 0.9925, 0.9968, 0.9783, 0.9754, and 0.9975. By analyzing the electromagnetic field and surface current distribution of the absorber, the absorption mechanism is further verified, and the corresponding influence on the absorption spectrum is studied according to different polarization angles and incident angles. The effects of different resonator structure size and dielectric layer thickness on absorption rate were also discussed, and the distribution of electromagnetic fields is analyzed to reveal the existence of electric dipole resonance and magnetic resonance. Through comparing experiments and simulations, it is found that the peaks of the 1st, 2nd, and 5th have smaller absorption errors and frequency deviation, while the peaks of the 3rd and 4th have large ones. The five-band absorber has potential application in multiband electromagnetic stealth, bionic sensor, thermal radiation measuring instrument, and so on.

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7

Hannan, Islam, Hoque, Singh e Almutairi. "Design of a Novel Double Negative Metamaterial Absorber Atom for Ku and K Band Applications". Electronics 8, n. 8 (31 luglio 2019): 853. http://dx.doi.org/10.3390/electronics8080853.

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This paper presents a multiband metamaterial (MM) absorber based on a novel spiral resonator with continuous, dual, and opposite P-shape. The full wave analysis shows 80.06% to 99.95% absorption at frequencies range for Ku and K bands for several substrate materials of 100 mm2 area. The results indicate that the absorption rate remains similar for different polarizing angles in TEM mode with different substrates. With FR4 (Flame Retardant 4) substrate and 64 mm2 ground plane, the design acts as single negative (SNG) MM absorber in K band resonance frequencies (19.75–21.37 GHz) and acts as double negative (DNG) absorber in Ku band resonance frequencies (15.28–17.07 GHz). However, for Rogers 3035 substrate and 36 mm2 ground plane, it acts as an SNG absorber for Ku band resonance frequency 14.64 GHz with 83.25% absorption and as a DNG absorber for K band frequencies (18.24–16.15 GHz) with 83.69% to 94.43% absorption. With Rogers 4300 substrate and 36 mm2 ground plane, it acts as an SNG absorber for Ku band at 15.04 GHz with 89.77% absorption and as DNG absorber for K band frequencies (22.17–26.88 GHz) with 92.87% to 93.72% absorption. The design was fabricated with all three substrates and showed quite similar results as simulation. In comparison with other broadband absorbers, this proposed MM absorber illustrated broad incidence angles in TEM mode.

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8

Gu, Chao, Shao-Bo Qu, Zhi-Bin Pei, Zhuo Xu, Jia Liu e Wei Gu. "Multiband terahertz metamaterial absorber". Chinese Physics B 20, n. 1 (gennaio 2011): 017801. http://dx.doi.org/10.1088/1674-1056/20/1/017801.

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9

Xu, Zong-Cheng, Run-Mei Gao, Chun-Feng Ding, Ya-Ting Zhang e Jian-Quan Yao. "Multiband Metamaterial Absorber at Terahertz Frequencies". Chinese Physics Letters 31, n. 5 (maggio 2014): 054205. http://dx.doi.org/10.1088/0256-307x/31/5/054205.

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10

Tian, Yiran, Guangjun Wen e Yongjun Huang. "Multiband Negative Permittivity Metamaterials and Absorbers". Advances in OptoElectronics 2013 (28 luglio 2013): 1–7. http://dx.doi.org/10.1155/2013/269170.

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Design and characteristics of multiband negative permittivity metamaterial and its absorber configuration are presented in this paper. The proposed multiband metamaterial is composed of a novel multibranch resonator which can possess four electric resonance frequencies. It is shown that, by controlling the length of the main branches of such resonator, the resonant frequencies and corresponding absorbing bands of metamaterial absorber can be shifted in a large frequency band.

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11

Zou, Jinglan, Jianfa Zhang, Yuwen He, Qilin Hong, Cong Quan e Zhihong Zhu. "Multiband metamaterial selective absorber for infrared stealth". Applied Optics 59, n. 28 (28 settembre 2020): 8768. http://dx.doi.org/10.1364/ao.405015.

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12

Gao, Runmei, Zongcheng Xu, Chunfeng Ding, Liang Wu e Jianquan Yao. "Graphene metamaterial for multiband and broadband terahertz absorber". Optics Communications 356 (dicembre 2015): 400–404. http://dx.doi.org/10.1016/j.optcom.2015.08.023.

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13

Jung, Seungwon, Young Ju Kim, Young Joon Yoo, Ji Sub Hwang, Bui Xuan Khuyen, Liang-Yao Chen e YoungPak Lee. "High-Order Resonance in a Multiband Metamaterial Absorber". Journal of Electronic Materials 49, n. 3 (3 ottobre 2019): 1677–88. http://dx.doi.org/10.1007/s11664-019-07661-1.

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14

Chen, Xu, e Wenhui Fan. "Ultra-flexible polarization-insensitive multiband terahertz metamaterial absorber". Applied Optics 54, n. 9 (18 marzo 2015): 2376. http://dx.doi.org/10.1364/ao.54.002376.

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15

Lee, Hong-Min, e Hyung-Sup Lee. "A Method for Extending the Bandwidth of Metamaterial Absorber". International Journal of Antennas and Propagation 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/859429.

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We present a method for extending the bandwidth of a metamaterial absorber (MMA) with multiresonance structure. The basic unit cell of the MMAs consists of a periodic arrangement of an electric-LC (ELC) resonator and a square loop structure. The absorption bandwidth of an MMA is effectively extended by combining five unit cell structures with different geometric dimensions into a coplanar unit cell. Experimental results show that the fabricated MMA is 0.8 mm (0.0026 λ0) thick with a peak absorption rate of 93% at 10 GHz and a full width at half maximum (FWHM) bandwidth of 970 MHz.

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16

Muthukrishnan, Kavitha, e Venkateswaran Narasimhan. "Multiband Terahertz Metamaterial Absorber Based on Multipolar Plasmonic Resonances". Plasmonics 16, n. 4 (20 gennaio 2021): 1049–57. http://dx.doi.org/10.1007/s11468-020-01322-4.

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17

Luo, Zhiyou, Shijun Ji, Ji Zhao, Han Wu e Handa Dai. "A multiband metamaterial absorber for GHz and THz simultaneously". Results in Physics 30 (novembre 2021): 104893. http://dx.doi.org/10.1016/j.rinp.2021.104893.

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18

Hu, Fangrong, Li Wang, Baogang Quan, Xinlong Xu, Zhi Li, Zhongan Wu e Xuecong Pan. "Design of a polarization insensitive multiband terahertz metamaterial absorber". Journal of Physics D: Applied Physics 46, n. 19 (24 aprile 2013): 195103. http://dx.doi.org/10.1088/0022-3727/46/19/195103.

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19

Zhao, Wenhan, Junqiao Wang, Ran Li e Bin Zhang. "Ultranarrow dual-band metamaterial perfect absorber and its sensing application". Journal of Optics 24, n. 3 (2 febbraio 2022): 035103. http://dx.doi.org/10.1088/2040-8986/ac4aba.

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Abstract In this paper, a dual-band metamaterial absorber (MMA) with wide-angle and high absorptivity is proposed. The MMA consists of two silver layers separated by a dielectric layer. Its top resonant element is constituted by two concentric ring resonators connected with four strips. Based on electromagnetic field simulation, the proposed MMA has two narrow absorption peaks with an absorption rate of 99.9% at 711 nm and 99.8% at 830 nm, and the corresponding line width of the two absorption peaks are only 9.7 and 9.8 nm. The dual-band MMA shows high absorptivity under wide incident angles. The simulated field pattern shows that dual-band perfect absorption is the combined result of the interaction of two concentric ring resonators and unit cell coupling. In addition, the hexapole plasmon mode can be observed at the outer ring at one absorption peak. The narrow plasmon resonance has a potential application in optical sensing, and can be used to measure the concentration of aqueous glucose with two frequency channels. The proposed MMA with high absorptivity is simple to manufacture, and has other potential applications, such as narrow-band filters, energy storage device, and so on.

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20

Song, Shitong, Fanyi Liu, Limei Qi, Zhao Zhang, Haodong Wang e Yuting Zhou. "A MoS2-based broadband and multiband metamaterial absorber in the visible band". Modern Physics Letters B 34, n. 34 (20 agosto 2020): 2050397. http://dx.doi.org/10.1142/s0217984920503972.

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A broadband MoS2-based absorber composed of Ag rod/MoS2/dielectric/Ag is proposed in the visible band. The relative bandwidth is 65% for the absorption above 80%. The absorber also has the properties of polarization-independence and wide-angle absorption. Impedance matching theory is used to analyze the physical mechanism of the broadband absorption. By investigating the absorption property of each part of the absorber, it is found that the absorption is enhanced by introducing the two-dimensional material MoS2. The broadband absorber can be changed to be multiband absorber by changing the thickness of dielectric substrate. This structure provides a new perspective to enhance absorption in the visible band and has promising applications in solar cells.

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21

Guo, Tian-Long, Fangfang Li e Matthieu Roussey. "Dielectric multilayer cavity coupled metamaterial". EPJ Web of Conferences 287 (2023): 04027. http://dx.doi.org/10.1051/epjconf/202328704027.

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Dielectric multilayer stack metasurface is coupled with a gold mirror forming a hybrid metamaterial that targeting at multiband absorption. The resonant mechanisms responsible for each absorption band are explained in this study. Furthermore, a potential fabrication process has been proposed and demonstrated. This absorber exhibits flexibility in design and feasibility in fabrication, which makes it an excellent candidate for various applications, particularly in the field of sensing.

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22

Chowdhury, Md Zikrul Bari, Mohammad Tariqul Islam, Ahasanul Hoque, Ahmed S. Alshammari, Ahmed Alzamil, Haitham Alsaif, Badr M. Alshammari, Ismail Hossain e Md Samsuzzaman. "Design and Parametric Analysis of a Wide-Angle and Polarization Insensitive Ultra-Broadband Metamaterial Absorber for Visible Optical Wavelength Applications". Nanomaterials 12, n. 23 (29 novembre 2022): 4253. http://dx.doi.org/10.3390/nano12234253.

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Researchers are trying to work out how to make a broadband response metamaterial absorber (MMA). Electromagnetic (EM) waves that can pass through the atmosphere and reach the ground are most commonly used in the visible frequency range. In addition, they are used to detect faults, inspect tapped live-powered components, electrical failures, and thermal leaking hot spots. This research provides a numerical analysis of a compact split ring resonator (SRR) and circular ring resonator (CRR) based metamaterial absorber (MMA) using a three-layer substrate material configuration for wideband visible optical wavelength applications. The proposed metamaterial absorber has an overall unit cell size of 800 nm × 800 nm × 175 nm in both TE and TM mode simulations and it achieved above 80% absorbance in the visible spectrums from 450 nm to 650 nm wavelength. The proposed MA performed a maximum absorptivity of 99.99% at 557 nm. In addition, the steady absorption property has a broad range of oblique incidence angle stability. The polarization conversion ratio (PCR) is evaluated to ensure that the MMA is perfect. Both TM and TE modes can observe polarization insensitivity and wide-angle incidence angle stability with 18° bending effects. Moreover, a structural study using electric and magnetic fields was carried out to better understand the MMA’s absorption properties. The observable novelty of the proposed metamaterial is compact in size compared with reference paper, and it achieves an average absorbance of 91.82% for visible optical wavelength. The proposed MMA also has bendable properties. The proposed MMA validation has been done by two numerical simulation software. The MMA has diverse applications, such as color image, wide-angle stability, substantial absorption, absolute invisible layers, thermal imaging, and magnetic resonance imaging (MRI) applications.

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23

Hossain, Ismail, Md Samsuzzaman, Mohd Hafiz Baharuddin, Norsuzlin Binti Mohd Sahar, Mandeep Singh Jit Singh e Mohammad Tariqul Islam. "Computational Investigation of Multiband EMNZ Metamaterial Absorber for Terahertz Applications". Computers, Materials & Continua 71, n. 2 (2022): 3905–20. http://dx.doi.org/10.32604/cmc.2022.022027.

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Zhang, Man, e Zhengyong Song. "Switchable terahertz metamaterial absorber with broadband absorption and multiband absorption". Optics Express 29, n. 14 (23 giugno 2021): 21551. http://dx.doi.org/10.1364/oe.432967.

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Lv, Yisong, Jinping Tian e Rongcao Yang. "Multiband tunable perfect metamaterial absorber realized by different graphene patterns". Journal of the Optical Society of America B 38, n. 8 (29 luglio 2021): 2409. http://dx.doi.org/10.1364/josab.428026.

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Yahiaoui, Riad, Jean Paul Guillet, Frédérick de Miollis e Patrick Mounaix. "Ultra-flexible multiband terahertz metamaterial absorber for conformal geometry applications". Optics Letters 38, n. 23 (21 novembre 2013): 4988. http://dx.doi.org/10.1364/ol.38.004988.

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Jiang, Hao, Zhenghui Xue, Weiming Li e Wu Ren. "Multiband polarisation insensitive metamaterial absorber based on circular fractal structure". IET Microwaves, Antennas & Propagation 10, n. 11 (agosto 2016): 1141–45. http://dx.doi.org/10.1049/iet-map.2015.0789.

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Liao, Y. L., e Y. Zhao. "A multiband polarization-insensitive metamaterial absorber in the infrared regime". Indian Journal of Physics 89, n. 2 (30 luglio 2014): 195–98. http://dx.doi.org/10.1007/s12648-014-0550-2.

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Wu, Han, Shijun Ji, Ji Zhao, Zhiyou Luo e Handa Dai. "Design and Analysis of a Triple-band Non-zonal Polarization Electromagnetic Metamaterial Absorber". Applied Computational Electromagnetics Society 36, n. 6 (6 agosto 2021): 697–706. http://dx.doi.org/10.47037/2020.aces.j.360611.

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A facile design of a novel triple-band electromagnetic metamaterial absorber (MMA) with polarization insensitive property is proposed in this paper. Each unit of the MMA consists of upper copper resonator and bottom copper plate with middle dielectric FR-4 between them. The MMA performs three absorption peaks at 16.919 GHz, 21.084 GHz and 25.266 GHz with absorption rates 99.90%, 97.76% and 99.18%, respectively. The influence of the main structural parameters on the frequencies and absorption rates is analyzed. The absorption mechanism of the absorber is explained by electric field, magnetic field and surface current distributions, which is supported by the electromagnetic parameters, affected with magnetic resonance. The polarization-insensitivity of TE wave is verified by observing the effects of the polarization angle change from 0-90º. The MMA can be applied in radiation, spectrum imaging detector, electromagnetic wave modulator, and so on.

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Ali, Hema Omer, e Asaad M. Al-Hindawi. "A Ultra-broadband Thin Metamaterial Absorber for Ku and K Bands Applications". Journal of Engineering 27, n. 5 (28 aprile 2021): 1–16. http://dx.doi.org/10.31026/j.eng.2021.05.01.

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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.

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Hakim, Mohammad Lutful, Abu Hanif, Touhidul Alam, Mohammad Tariqul Islam, Haslina Arshad, Mohamed S. Soliman, Saleh Mohammad Albadran e Md Shabiul Islam. "Ultrawideband Polarization-Independent Nanoarchitectonics: A Perfect Metamaterial Absorber for Visible and Infrared Optical Window Applications". Nanomaterials 12, n. 16 (18 agosto 2022): 2849. http://dx.doi.org/10.3390/nano12162849.

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This article presents numerical analysis of an ultrathin concentric hexagonal ring resonator (CHRR) metamaterial absorber (MMA) for ultrawideband visible and infrared optical window applications. The proposed MMA exhibits an absorption of above 90% from 380 to 2500 nm and an average absorbance of 96.64% at entire operational bandwidth with a compact unit cell size of 66 × 66 nm2. The designed MMA shows maximum absorption of 99% at 618 nm. The absorption bandwidth of the MMA covers the entire visible and infrared optical windows. The nickel material has been used to design the top and bottom layer of MMA, where aluminium nitride (AlN) has been used as the substrate. The designed hexagonal MMA shows polarization-independent properties due to the symmetry of the design and a stable absorption label is also achieved for oblique incident angles up to 70 °C. The absorption property of hexagonal ring resonator MMA has been analyzed by design evaluation, parametric and various material investigations. The metamaterial property, surface current allocation, magnetic field and electric field have also been analyzed to explore the absorption properties. The proposed MMA has promising prospects in numerous applications like infrared detection, solar cells, gas detection sensors, imaging, etc.

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A., Elakkiya, Radha Sankararajan, Sreeja B.S. e Manikandan E. "Modified I-shaped hexa-band near perfect terahertz metamaterial absorber". Circuit World 46, n. 4 (16 luglio 2020): 281–84. http://dx.doi.org/10.1108/cw-11-2019-0155.

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Purpose A novel and simple six-band metamaterial absorber is proposed in the terahertz region, which is composed of an I-shaped absorber and circular ring with four gaps and a continuous metal ground plane separated by only 0.125 mm polyimide dielectric substrate. Initially, I-shaped resonator gives three bands at 0.4, 0.468 and 0.4928 THz with the absorptivity of 99.3%, 97.9% and 99.1%, respectively. The purpose of this paper is to improve the number of bands, for which the authors added the circular ring with four gaps, so the simulated metamaterial absorber exhibited six absorption peaks at 0.3392, 0.3528, 0.3968, 0.4676, 0.4768 and 0.492 THz, with the absorption rate of 91.4%, 94.2%, 94.9%, 90.3%, 77.5% and 97.4%, respectively. The surface current distribution and angle independence are explained for all the six frequencies which are used to analyze the absorption mechanism clearly. Structure maximum uses the squares and circles, so it will make the fabrication easy. The multiband absorbers obtained here have potential applications in many engineering technology, thermal radiation, material detection and imaging and optoelectronic areas. Design/methodology/approach This paper presents the design of the six-band metamaterial absorber which is from the I-shaped resonator and circular ring with four gaps and the metallic ground plane separated by the 0.125 polyimide dielectric substrate. The absorber exhibited six absorption peaks at 0.3392, 0.3528, 0.3968, 0.4676, 0.4768 and 0.492 THz, with the absorption rate of 91.4%, 94.2%, 94.9%, 90.3%, 77.5% and 97.4%, respectively. From the fabrication point of view, the proposed six-band metamaterial absorber has a very simple geometrical structure, and it is very easy to be fabricated. Findings The authors present a new and simple design of six-band absorber based on an I-shaped absorber and circular ring with four gaps and a metallic ground plane separated by a polyimide layer having the thickness of 0.125 mm. Six different resonance absorption peaks are found at 0.3392, 0.3528, 0.3968, 0.4676 , 0.4768 and 0.492 THz. Surface current distribution and angle independence plot have been studied to understand the absorption behavior of the designed terahertz metamaterial absorber. Originality/value The multiband absorbers obtained here have potential applications in many engineering technology, thermal radiation, material detection, security, sensors, imaging and optoelectronic areas.

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Luo, Hao, e Yong Zhi Cheng. "Design of an ultrabroadband visible metamaterial absorber based on three-dimensional metallic nanostructures". Modern Physics Letters B 31, n. 25 (6 settembre 2017): 1750231. http://dx.doi.org/10.1142/s0217984917502311.

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We present the design and numerical simulations of an ultrabroadband visible metamaterial absorber (MMA) with polarization-insensitive and wide-angle based on three-dimensional (3D) metallic nanostructure. Distinct from previous designs, the proposed visible MMA only consisted of structured 3D metallic film constructed with an assembly of four vertical split-rings (FVSR) structure. For the optimized design of our MMA, the absorbance of over 90% with a relative bandwidth of 94.8% can be obtained. Further simulation results indicate that our design is polarization-insensitive and also operated well in a wide range of incident angles for both TE and TM modes. In addition, the designed visible MMA design can tolerate some geometric parameters errors in fabrication. Thus, the proposed visible MMA can be potential application in the photodetectors, thermal imaging, photoelectrochemical, and solar energy harvesting devices.

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El Assal, Aicha, Hanadi Breiss, Ratiba Benzerga, Ala Sharaiha, Akil Jrad e Ali Harmouch. "Toward an Ultra-Wideband Hybrid Metamaterial Based Microwave Absorber". Micromachines 11, n. 10 (13 ottobre 2020): 930. http://dx.doi.org/10.3390/mi11100930.

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In this paper, we propose a novel design of an ultra-wideband hybrid microwave absorber operating in the frequency range between 2 GHz and 18 GHz. This proposed hybrid absorber is composed of two different layers that integrate a multiband metamaterial absorber and a lossy dielectric layer. The metamaterial absorber consists of a periodic pattern that is composed of an arrangement of different scales of coupled resonators and a metallic ground plane, and the dielectric layer is made of epoxy foam composite loaded with low weight percentage (0.075 wt.%) of 12 mm length carbon fibers. The numerical results show a largely expanded absorption bandwidth that ranges from 2.6 GHz to 18 GHz with incident angles between 0° and 45° and for both transverse electric and transverse magnetic waves. The measurements confirm that absorption of this hybrid based metamaterial absorber exceeds 90% within the above-mentioned frequency range and it may reach an absorption rate of 99% for certain frequency ranges. The proposed idea offers a further step in developing new electromagnetic absorbers, which will impact a broad range of applications.

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Tang, Yibo, Longhui He, Anfeng Liu, Cuixiu Xiong e Hui Xu. "Optically transparent metamaterial absorber based on Jerusalem cross structure at S-band frequencies". Modern Physics Letters B 34, n. 16 (31 marzo 2020): 2050175. http://dx.doi.org/10.1142/s0217984920501754.

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An optically transparent metamaterial absorber (MMA) has been demonstrated numerically and experimentally at the S-band. The designed MMA is composed of polymethyl methacrylate (PMMA), indium-tin-oxide (ITO) attached to polyethylene terephthalate (PET) film, and numerically provides effective absorption with reflection loss lower than −10 dB in the frequency range of 1.85–4.65 GHz. Experimental measurement shows the reflection loss of the proposed MMA is better than −10 dB from 2.00 GHz to 4.25 GHz, which agrees pretty well with the simulated results. Distributions of surface current, electromagnetic field and power loss density for the designed MMA are systematically investigated to explain microwave attenuation characteristic and loss mechanisms. More importantly, the prepared sample exhibits an optical transparency above 68% in the whole visible band, thus realizing a wide range of applications, such as optically transparent S-band absorbers.

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Chen, Fu, Yongzhi Cheng e Hui Luo. "A Broadband Tunable Terahertz Metamaterial Absorber Based on Single-Layer Complementary Gammadion-Shaped Graphene". Materials 13, n. 4 (14 febbraio 2020): 860. http://dx.doi.org/10.3390/ma13040860.

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We present a simple design of a broadband tunable metamaterial absorber (MMA) in the terahertz (THz) region, which consists of a single layer complementary gammadion-shaped (CGS) graphene sheet and a polydimethylsiloxane (PDMS) dielectric substrate placed on a continuous metal film. The Fermi energy level (Ef) of the graphene can be modulated dynamically by the applied DC bias voltage, which enables us to electrically control the absorption performance of the proposed MMA flexibly. When Ef = 0.8 eV, the relative bandwidth of the proposed MMA, which represents the frequency region of absorption beyond 90%, can reaches its maximal value of 72.1%. Simulated electric field distributions reveal that the broadband absorption mainly originates from the excitation of surface plasmon polaritons (SPPs) on the CGS graphene sheet. Furthermore, the proposed MMA is polarization-insensitive and has wide angles for both transverse-electric (TE) and transverse-magnetic (TM) waves in the broadband frequency range. The broadband absorption capacity of the designed MMA can be effectively adjusted by varying the Fermi energy level of graphene. Lastly, the absorbance of the MMA can be adjusted from 42% to 99.1% by changing the Ef from 0 eV to 0.8 eV, which is in agreement with the theoretical calculation by using the interference 41theory. Due to its simple structure and flexible tunability, the proposed MMA has potential application prospects in tunable filtering, modulators, sensing, and other multispectral devices.

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Wang Wen-Jie, Wang Jia-Fu, Yan Ming-Bao, Lu Lei, Ma Hua, Qu Shao-Bo, Chen Hong-Ya e Xu Cui-Lian. "Ultra-thin multiband metamaterial absorber based on multi-order plasmon resonances". Acta Physica Sinica 63, n. 17 (2014): 174101. http://dx.doi.org/10.7498/aps.63.174101.

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Tran, Cuong Manh, Hai Van Pham, Hien Thuy Nguyen, Thuy Thi Nguyen, Lam Dinh Vu e Tung Hoang Do. "Creating Multiband and Broadband Metamaterial Absorber by Multiporous Square Layer Structure". Plasmonics 14, n. 6 (11 maggio 2019): 1587–92. http://dx.doi.org/10.1007/s11468-019-00953-6.

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Gunduz, O. T., e C. Sabah. "Polarization angle independent perfect multiband metamaterial absorber and energy harvesting application". Journal of Computational Electronics 15, n. 1 (2 agosto 2015): 228–38. http://dx.doi.org/10.1007/s10825-015-0735-8.

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Mulla, Batuhan, e Cumali Sabah. "Ultrathin thermally stable multiband metamaterial absorber design for solar energy applications". Journal of Nanophotonics 12, n. 01 (25 gennaio 2018): 1. http://dx.doi.org/10.1117/1.jnp.12.016005.

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41

Li, Xiaoman, He Feng, Maojin Yun, Zan Wang, Yigu Hu, Yunjiao Gu, Fenghua Liu e Weiping Wu. "Polarization-independent and all-optically modulated multiband metamaterial coherent perfect absorber". Optics & Laser Technology 166 (novembre 2023): 109644. http://dx.doi.org/10.1016/j.optlastec.2023.109644.

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42

Hakim, Mohammad Lutful, Mohammad Tariqul Islam, Touhidul Alam, Sharul Kamal Abdul Abdul Rahim, Badariah Bais, Md Shabiul Islam e Mohamed S. Soliman. "Triple-Band Square Split-Ring Resonator Metamaterial Absorber Design with High Effective Medium Ratio for 5G Sub-6 GHz Applications". Nanomaterials 13, n. 2 (4 gennaio 2023): 222. http://dx.doi.org/10.3390/nano13020222.

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This article proposes a square split-ring resonator (SSRR) metamaterial absorber (MMA) for sub-6 GHz application. The unit cell of the MMA was designed and fabricated on commercially available low-cost FR-4 substrate material with a dielectric constant o 4.3. The higher effective medium ratio (EMR) of the designed unit cell shows the compactness of the MMA. The dimension of the unit cell is 9.5 × 9.5 × 1.6 mm3, which consists of two split rings and two arms with outer SSRR. The proposed MMA operates at 2.5 GHz, 4.9 GHz, and 6 GHz frequency bands with a 90% absorption peak and shows a single negative metamaterial property. The E-field, H-field, and surface current are also explored in support of absorption analysis. Moreover, the equivalent circuit model of the proposed MMA is modelled and simulated to validate the resonance behavior of the MMA structure. Finally, the proposed MMA can be used for the specific frequency bands of 5G applications such as signal absorption, crowdsensing, SAR reduction, etc.

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Qi, Buxiong, Wenqiong Chen, Tiaoming Niu e Zhonglei Mei. "Ultra-Broadband Refractory All-Metal Metamaterial Selective Absorber for Solar Thermal Energy Conversion". Nanomaterials 11, n. 8 (21 luglio 2021): 1872. http://dx.doi.org/10.3390/nano11081872.

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A full-spectrum near-unity solar absorber has attracted substantial attention in recent years, and exhibited broad application prospects in solar thermal energy conversion. In this paper, an all-metal titanium (Ti) pyramid structured metamaterial absorber (MMA) is proposed to achieve broadband absorption from the near-infrared to ultraviolet, exhibiting efficient solar-selective absorption. The simulation results show that the average absorption rate in the wavelength range of 200–2620 nm reached more than 98.68%, and the solar irradiation absorption efficiency in the entire solar spectrum reached 98.27%. The photothermal conversion efficiency (PTCE) reached 95.88% in the entire solar spectrum at a temperature of 700 °C. In addition, the strong and broadband absorption of the MMA are due to the strong absorption of local surface plasmon polariton (LSPP), coupled results of multiple plasmons and the strong loss of the refractory titanium material itself. Additionally, the analysis of the results show that the MMA has wide-angle incidence and polarization insensitivity, and has a great processing accuracy tolerance. This broadband MMA paves the way for selective high-temperature photothermal conversion devices for solar energy harvesting and seawater desalination applications.

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Luo, Zhiyou, Shijun Ji, Ji Zhao, Zhenze Liu e Handa Dai. "An ultra-thin flexible conformal four-band metamaterial absorber applied in S-/C-/X-band". Physica Scripta 97, n. 4 (17 marzo 2022): 045813. http://dx.doi.org/10.1088/1402-4896/ac5bbe.

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Abstract In recent years, many kinds of multiband metamaterial absorbers (MMAs) have sprung up. However, most of their dielectric layers were filled with rigid dielectric materials, which has many limitations in practical application. In this paper, an ultra-thin flexible conformal four-band metamaterial absorber (FMMA) is presented based on the dielectric material of polyimide (PI), and its thickness is only 0.0047 of the wavelength at the lowest absorption frequency. The top resonator is adopted a hollow structure, which is different from the common strip and ring structure, providing a novel idea for multiband absorber design. The proposed FMMA achieved four absorption peaks with an absorptivity higher than 90% from S-band to X-band. Meanwhile, in both TE and TM modes, it is insensitive to polarized waves and maintains good absorption under a wide incident angle. The experiment is carried out to demonstrate that the FMMA has satisfactory absorption performance. Due to its flexible conformal characteristic and good absorption performance, the FMMA can be applied in electromagnetic shielding of a curved surface, meteorological satellite, and radar detection.

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Alsulami, Qana A., S. Wageh, Ahmed A. Al-Ghamdi, Rana Muhammad Hasan Bilal e Muhammad Ahsan Saeed. "A Tunable and Wearable Dual–Band Metamaterial Absorber Based on Polyethylene Terephthalate (PET) Substrate for Sensing Applications". Polymers 14, n. 21 (25 ottobre 2022): 4503. http://dx.doi.org/10.3390/polym14214503.

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Abstract (sommario):

Advanced wireless communication technology claims miniaturized, reconfigurable, highly efficient, and flexible meta-devices for various applications, including conformal implementation, flexible antennas, wearable sensors, etc. Therefore, bearing these challenges in mind, a dual-band flexible metamaterial absorber (MMA) with frequency-reconfigurable characteristics is developed in this research. The geometry of the proposed MMA comprises a square patch surrounded by a square ring, which is mounted over a copper-backed flexible dielectric substrate. The top surface of the MMA is made of silver nanoparticle ink and a middle polyethylene terephthalate (PET) substrate backed by a copper groundsheet. The proposed MMA shows an absorption rate of above 99% at 24 and 35 GHz. In addition, the absorption features are also studied for different oblique incident angles, and it is found that the proposed MMA remains stable for θ = 10–50°. The frequency tunability characteristics are achieved by stimulating the capacitance of the varactor diode, which connects the inner patch with the outer ring. To justify the robustness and conformability of the presented MMA, the absorption features are also studied by bending the MMA over different radii of an arbitrary cylinder. Moreover, a multiple-reflection interference model is developed to justify the simulated and calculated absorption of the proposed MMA. It is found that the simulated and calculated results are in close agreement with each other. This kind of MMA could be useful for dual-band sensing and filtering operations.

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Sharma, Atipriya, Ravi Panwar e Rajesh Khanna. "Development of Single layered, Wide angle, Polarization insensitive Metamaterial Absorber". Defence Science Journal 71, n. 03 (17 maggio 2021): 372–77. http://dx.doi.org/10.14429/dsj.71.16701.

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The simultaneous achievement of multiband absorption, polarisation-insensitive, and angularly stable absorber is a difficult job. Therefore, in this article, an efficient single-layered absorber is designed, critically analysed, fabricated, and experimentally validated. The proposed model incorporates eight sectors loaded a circle inside the square. The four discrete absorption peaks are observed at 4.4 GHz, 6.0 GHz, 14.1 GHz, and 16.0 GHz manifesting absorption intensities of 94%, 84%, 82%, and 92%, respectively. Parametric studies have been also exercised to investigate the influence of discrete geometrical design variables on the proposed absorber. The proposed structure is symmetrical in geometry, consequence in polarisation-independent behaviour. The absorption mechanism is also explained by analysing the surface current, electric field, and magnetic field distributions. Besides, the complex electromagnetic parameters are extracted to realise the absorption phenomenon. Additionally, to validate the simulated results, an optimal sample is fabricated and the measured response is well-matched with simulated ones.

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Evangeline Persis, G. P., J. John Paul, Thusnavis Bella Mary e R. Catherine Joy. "A compact tilted split ring multiband metamaterial absorber for energy harvesting applications". Materials Today: Proceedings 56 (2022): 368–72. http://dx.doi.org/10.1016/j.matpr.2022.01.206.

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Xiao, Dong, e Keyu Tao. "Ultra-compact metamaterial absorber for multiband light absorption at mid-infrared frequencies". Applied Physics Express 8, n. 10 (24 settembre 2015): 102001. http://dx.doi.org/10.7567/apex.8.102001.

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Mulla, Batuhan, e Cumali Sabah. "Multiband Metamaterial Absorber Design Based on Plasmonic Resonances for Solar Energy Harvesting". Plasmonics 11, n. 5 (13 gennaio 2016): 1313–21. http://dx.doi.org/10.1007/s11468-015-0177-y.

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Aksimsek, Sinan. "Design of an ultra-thin, multiband, micro-slot based terahertz metamaterial absorber". Journal of Electromagnetic Waves and Applications 34, n. 16 (29 agosto 2020): 2181–93. http://dx.doi.org/10.1080/09205071.2020.1809532.

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