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Journal articles on the topic 'Absorbing metasurface'

Author: Grafiati

Published: 6 September 2023

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1

Liu, Kai, Suhua Jiang, Dengxin Ji, Xie Zeng, Nan Zhang, Haomin Song, Yun Xu, and Qiaoqiang Gan. "Super Absorbing Ultraviolet Metasurface." IEEE Photonics Technology Letters 27, no. 14 (July 15, 2015): 1539–42. http://dx.doi.org/10.1109/lpt.2015.2428621.

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2

Mitrofanov, Oleg, and Igal Brener. "All-dielectric photoconductive metasurfaces for terahertz applications." Photoniques, no. 101 (March 2020): 47–52. http://dx.doi.org/10.1051/photon/202010147.

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We review applications of all-dielectric metasurfaces for one of the cornerstone technologies in THz research – ultrafast photoconductive (PC) switches – which are widely used as sources and detectors of broadband THz pulses. Nanostructuring the PC switch channel as a perfectly-absorbing and optically thin PC metasurface allows us to engineer the optical as well as the electronic properties of the channel and improve the efficiency of THz detectors. This approach also opens new routes for employing novel PC materials and enabling new device architectures including THz detector arrays.

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3

Meng, Fan-Guang, Hao Li, Di-Gang Fan, Fei-Fei Li, Feng-Zhi Xue, Ping Chen, and Rui-Xin Wu. "Transmitting-absorbing material based on resistive metasurface." AIP Advances 8, no. 7 (July 2018): 075008. http://dx.doi.org/10.1063/1.5037772.

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4

Jing, Yun, and Jun Ji. "Optimization on metasurface-enabled sound absorbing panels." Journal of the Acoustical Society of America 146, no. 4 (October 2019): 2829. http://dx.doi.org/10.1121/1.5136802.

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5

Donda, Krupali, Yifan Zhu, Shi-Wang Fan, Liyun Cao, Yong Li, and Badreddine Assouar. "Extreme low-frequency ultrathin acoustic absorbing metasurface." Applied Physics Letters 115, no. 17 (October 21, 2019): 173506. http://dx.doi.org/10.1063/1.5122704.

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6

Li, Junfei, Wenqi Wang, Yangbo Xie, Bogdan Popa, and Steven A. Cummer. "A sound absorbing metasurface with coupled resonators." Journal of the Acoustical Society of America 140, no. 4 (October 2016): 2959. http://dx.doi.org/10.1121/1.4969138.

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7

Bychanok, D., S. Li, G. Gorokhov, K. Piasotski, D. Meisak, P. Kuzhir, E. A. Burgess, et al. "Fully carbon metasurface: Absorbing coating in microwaves." Journal of Applied Physics 121, no. 16 (April 28, 2017): 165103. http://dx.doi.org/10.1063/1.4982232.

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8

Siday, Thomas, Polina P. Vabishchevich, Lucy Hale, Charles Thomas Harris, Ting Shan Luk, John L. Reno, Igal Brener, and Oleg Mitrofanov. "Terahertz Detection with Perfectly-Absorbing Photoconductive Metasurface." Nano Letters 19, no. 5 (April 4, 2019): 2888–96. http://dx.doi.org/10.1021/acs.nanolett.8b05118.

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9

Li, Junfei, Wenqi Wang, Yangbo Xie, Bogdan-Ioan Popa, and Steven A. Cummer. "A sound absorbing metasurface with coupled resonators." Applied Physics Letters 109, no. 9 (August 29, 2016): 091908. http://dx.doi.org/10.1063/1.4961671.

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10

Kumar, Pankaj, Akhlesh Lakhtakia, and Pradip K. Jain. "Tricontrollable pixelated metasurface for absorbing terahertz radiation." Applied Optics 58, no. 35 (December 2, 2019): 9614. http://dx.doi.org/10.1364/ao.58.009614.

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11

Wu, Dong, Yang Meng, and Chang Liu. "Design of Transparent Metasurfaces Based on Asymmetric Nanostructures for Directional and Selective Absorption." Materials 13, no. 17 (August 25, 2020): 3751. http://dx.doi.org/10.3390/ma13173751.

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Maximizing the solar heat gain through windows in winter and minimizing the solar radiation entering the room in summer are of great significance for the energy saving of buildings. Here, we present a new idea for transparent metasurfaces, based on asymmetric metal/insulator/metal (MIM) nanostructures, which can be switched back and forth between absorbing and reflecting solar radiation by reversing the sample orientation. Owing to the fundamental mode of a low-quality-factor resonance, a selective near-infrared absorption is obtained with an absorption peak value of 90% upon front illumination. The average solar absorption (45%) is about 10% higher than that (35%) of reported transparent absorbers. The near-infrared light is also strongly and selectively reflected upon back illumination and a reflection peak value above 70% is observed. Meanwhile, the average visible transmission of the metasurface is above 60%, which is about 1.6 times that (36%) of previous transparent metasurface absorbers. In addition, Cu material can replace the noble metals in this work, which will greatly reduce the manufacturing cost. Owing to the attractive properties of directional and selective absorption, passive operation mode, and low cost of the materials, the metasurfaces have promising prospects in building energy saving or other solar applications where surface transparency is desirable.

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12

Liang, Qingxuan, Peiyao Lv, Jin He, Yutao Wu, Fuyin Ma, and Tianning Chen. "A controllable low-frequency broadband sound absorbing metasurface." Journal of Physics D: Applied Physics 54, no. 35 (June 22, 2021): 355109. http://dx.doi.org/10.1088/1361-6463/ac08cd.

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13

Crivoi, Alexandru, Danylo Lisevych, and Zheng Fan. "A cellular sound-absorbing metasurface with subwavelength thickness." Journal of the Acoustical Society of America 146, no. 4 (October 2019): 2788. http://dx.doi.org/10.1121/1.5136662.

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14

Mavrakakis, K., J. H. Booske, and N. Behdad. "Narrowband, infrared absorbing metasurface using polystyrene thin films." Journal of Applied Physics 127, no. 7 (February 21, 2020): 074504. http://dx.doi.org/10.1063/1.5121328.

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15

Feng, Kui-Sheng, Na Li, and Tong Li. "Ultra-thin ultra-wideband tunable radar absorber based on hybrid incorporation of active devices." Acta Physica Sinica 71, no. 3 (2022): 034101. http://dx.doi.org/10.7498/aps.71.20211254.

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Structural radar absorber has important application in stealth field for its ability to effectively absorb incoming radar wave and to bear the load at the same time. Metasurface absorbers can achieve nearly-perfect absorption of radar wave, and have characteristics of light weight and thin structure, but their bandwidth are usually narrow. To solve this problem, a new method of broadening the bandwidth of metasurface absorber is proposed in this work. With varactor and PIN diode integrated in a hybrid manner, the continuous tunning and discrete switching are combined together to broaden the effective absorption bandwidth of the absorber. Using this method, an ultra-wideband tunable metasurface absorber is designed and the absorbing mechanism is analyzed in depth. By changing the bias voltages of PIN diodes and varactors, the absorbing frequency can be continuously tuned within a wide band from 4.57 GHz to 8.51 GHz. Measured results verify the low radar cross section characteristics of the absorber and the effectiveness of the design method. The proposed method is simple and feasible, and can be extended to other broadband structure design.

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16

Yuan, Fang, Qiang Chen, Yuejun Zheng, and Yunqi Fu. "Dual-Mechanism Absorptive Metasurface with Wideband 20 dB RCS Reduction." Crystals 12, no. 4 (April 2, 2022): 493. http://dx.doi.org/10.3390/cryst12040493.

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This paper presents a dual-mechanism method to design a single-layer absorptive metasurface with wideband 20 dB RCS reduction by simultaneously combining the absorption and phase cancellation mechanisms. The metasurface comprises two kinds of absorbing unit cells with 10 dB absorption performance but different reflection phases. The impedance condition for 20 dB RCS reduction is theoretically analyzed considering both the absorption and the phase cancellation based on the two unit cells, and the relationship between the surface impedance and the reflection phase/amplitude is revealed. According to these analyses, two unit cells with absorption performance and different reflection phases are designed and utilized to realize the absorptive metasurface. Numerical and experimental results show that the single-layer absorptive metasurface features wideband 20 dB RCS within 11.5–16 GHz with a thickness of only 3 mm.

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17

Donda, Krupali, Yifan Zhu, Aurélien Merkel, Shi-Wang Fan, Liyun Cao, Sheng Wan, and Badreddine Assouar. "Ultrathin acoustic absorbing metasurface based on deep learning approach." Smart Materials and Structures 30, no. 8 (June 18, 2021): 085003. http://dx.doi.org/10.1088/1361-665x/ac0675.

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18

Takasugi, Shota, Keita Watanabe, Masaaki Misawa, and Kenji Tsuruta. "Low-frequency sound absorbing metasurface using multilayer split resonators." Japanese Journal of Applied Physics 60, SD (February 22, 2021): SDDA01. http://dx.doi.org/10.35848/1347-4065/abe2e5.

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19

Chevalier, Paul, Patrick Bouchon, Julien Jaeck, Diane Lauwick, Nathalie Bardou, Alain Kattnig, Fabrice Pardo, and Riad Haïdar. "Absorbing metasurface created by diffractionless disordered arrays of nanoantennas." Applied Physics Letters 107, no. 25 (December 21, 2015): 251108. http://dx.doi.org/10.1063/1.4938472.

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20

Beletskii, M., and I. Popovych. "NON-REFLECTIVE INCIDENCE OF P-POLARIZED ELECTROMAGNETIC WAVES ON THE SOLID-STATE STRUCTURE "UNIAXIAL PLASMONIC METASURFACE — DIELECTRIC LAYER — METAL"." RADIO PHYSICS AND RADIO ASTRONOMY 28, no. 2 (2023): 166–73. http://dx.doi.org/10.15407/rpra28.02.166.

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Subject and Purpose. The solid-state structures involving metasurfaces can be used to effectively control some of the basic properties of electromagnetic waves, like amplitude, phase and polarization. The present work is aimed at analyzing the new effects that may appear during incidence of p-polarized electromagnetic waves upon a solid-state structure involving a uniaxial plasmonic metasurface, a dielec- tric interlayer, and a layer of metal. Methods and Methodology. The conditions suitable for identifying the effects that result from the reflection of a p-polarized electro- magnetic wave incident upon a solid-state structure of the above described type have been sought for via numerical simulation. That has allowed finding the magnitudes of the essential parameters, such as angles of incidence and frequencies of the electromagnetic waves, as well as thicknesses of the dielectric interlayer, that could stipulate appearance of novel electromagnetic effects. Results. It has been shown that the solid-state structure involving a uniaxial plasmonic metasurface, a dielectric interlayer, and a layer of metal is capable, under certain conditions, to fully absorb an incident electromagnetic wave of p-polarization. Moreover, a new effect has been predicted, specifically that of full conversion of the incident p-polarized electromagnetic wave into a reflected wave of s-polariza- tion. The necessary condition is that the plane of incidence of the electromagnetic wave were at an acute angle to the principal symmetry axis of the plasmonic metasurface. Conclusions. The solid-state structures of the type involving a uniaxial plasmonic metasurface, a dielectric interlayer, and a layer of metal are characterized by unique reflective properties. They are capable of fully absorbing, under certain conditions, the p-polarized electromagnetic waves incident upon them. Such structures can be used for creating optical and nanoelectronic devices of new types.

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21

Khan, Hamza Asif, Umair Rafique, Syed Muzahir Abbas, Fahad Ahmed, Yifei Huang, Junaid Ahmed Uqaili, and Abdelhady Mahmoud. "Polarization-Independent Ultra Wideband RCS Reduction Conformal Coding Metasurface Based on Integrated Polarization Conversion-Diffusion-Absorption Mechanism." Photonics 10, no. 3 (March 7, 2023): 281. http://dx.doi.org/10.3390/photonics10030281.

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An ultra wideband (UWB) radar cross-section (RCS) reduction metasurface has received attention in recent years. However, the majority of the research has concentrated on the physics and design of planar surfaces, which do not meet the standards of modern aerodynamics and aesthetics. In this paper, we offer a sophisticated strategy for designing a metasurface that can conform to the shape of any object, even those of moderate curvature, and can also achieve UWB RCS reduction by combining absorption, polarization conversion, and diffusion mechanisms. Firstly, an absorbing-polarization converter is designed, composed of a square patch with a truncated diagonal strip and ring. A thin Rogers RT/Duroid 5880 dielectric substrate layer is used in the structure, which is also appropriate for conformal conditions. The substrate layer and the ground plane are separated by an air gap to enhance the polarization conversion bandwidth (PCBW). For normal incident electromagnetic (EM) waves, the PCBW ranges from 10.8 to 31.3 GHz with polarization conversion ratio (PCR) values greater than 0.9 dB. Up to a 45∘ oblique incidence angle over the aforementioned band, the PCR efficiency is well maintained. Then, the optimized coding metasurface is formed by the Pancharatnam–Berry (PB) phase, consisting of meta-atoms “0” and “1” of the same size but different orientations, to realize the concept of cross-polarization diffusion. A theoretical investigation has been performed to analyze the RCS reduction performance of planar as well as conformal cylindrical surfaces. The results show that more than 10 dB of RCS reduction is experienced over UWB (10.8–31.3 GHz) for planar metasurfaces under linearly and circularly polarized incidence waves. Furthermore, the RCS reduction for cylindrical surfaces can be achieved in a similar frequency band above 10 dB up to an angle of 90∘. It can be deduced that our proposed flexible metasurface can be used as an absorber or a polarization converter and provide broadband RCS reduction, which is essential for multi-function and conformal stealth applications.

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22

Xu, Qishan, Jing Qiao, Guangyu Zhang, and Longqiu Li. "Low-frequency sound-absorbing metasurface constructed by a membrane-covered and coiled Helmholtz resonator." Journal of Applied Physics 133, no. 7 (February 21, 2023): 075106. http://dx.doi.org/10.1063/5.0138834.

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Achieving broadband absorption of sound waves below 500 Hz with materials of sub-wavelength thickness is significant but still a great challenge in academia and industries. Here, we present and theoretically analyze an airtight sound-absorbing metasurface constructed by a membrane-covered and coiled Helmholtz resonator. It is discovered that the metasurface possesses a near-perfect absorption with a working wavelength approximately 33.6 times greater than the total thickness, which stems from synthetic modulation on acoustic reactance brought by the membrane, air gap formed behind the membrane, and a coiled channel. Furthermore, on-demand broadband absorption below 500 Hz is achieved by parallel assemblies consisting of four subunits. An excellent agreement between measurements and predictions confirms the validity of the proposed structures. The airtight construction also broadens its application scenarios compared to the common perforated absorbers with open pores directly exposed to external environments. Our design provides a new structure paradigm for low-frequency sound absorption.

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23

Alam, Md Mottahir, Ahteshamul Haque, Asif Irshad Khan, Samir Kasim, Amjad Ali Pasha, Aasim Zafar, Kashif Irshad, Anis Ahmad Chaudhary, Md Samsuzzaman, and Rezaul Azim. "Metasurface-Based Solar Absorption Prediction System Using Artificial Intelligence." Journal of Mathematics 2023 (June 6, 2023): 1–18. http://dx.doi.org/10.1155/2023/9489270.

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Solar energy is a significant, environment-friendly source of renewable energy. The solar absorber transforms solar radiation into heat energy as an effective green energy source. Therefore, increasing its absorbing capacity can improve a solar absorber’s effectiveness. This paper proposes a tungsten tantalum alloy with silicon dioxide (WTa-SiO2) ceramic layer-based solar absorber system with two different metasurfaces to enhance absorptivity and boost the solar absorber efficacy. The absorbance is also improved by adjusting the resonator thickness and material thickness, and the maximum visible light absorption is achieved by the suggested solar filter design. Moreover, Golden Eagle Optimization (GE)-based deep AlexNet algorithm is proposed for predicting the parameter variation and their effect on absorbance. The optimization technique is used to increase the effectiveness of the solar absorber by optimizing the design parameters. The features from the WTa-SiO2 design are extracted by the proposed Principal Component-Autoencoder (PC-AE) method. Experimental results show that the proposed system can effectively predict absorptivity with a reduced computational time. The proposed method demonstrates superior prediction performance with an absorption prediction efficiency of 99.8% compared to the existing methods. Thus, the proposed WTa-SiO2 metasurface-based solar absorber can be used for photovoltaic applications.

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Masoudian Saadabad, Reza, Christian Pauly, Norbert Herschbach, Dragomir N. Neshev, Haroldo T. Hattori, and Andrey E. Miroshnichenko. "Highly Efficient Near-Infrared Detector Based on Optically Resonant Dielectric Nanodisks." Nanomaterials 11, no. 2 (February 8, 2021): 428. http://dx.doi.org/10.3390/nano11020428.

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Fast detection of near-infrared (NIR) photons with high responsivity remains a challenge for photodetectors. Germanium (Ge) photodetectors are widely used for near-infrared wavelengths but suffer from a trade-off between the speed of photodetection and quantum efficiency (or responsivity). To realize a high-speed detector with high quantum efficiency, a small-sized photodetector efficiently absorbing light is required. In this paper, we suggest a realization of a dielectric metasurface made of an array of subwavelength germanium PIN photodetectors. Due to the subwavelength size of each pixel, a high-speed photodetector with a bandwidth of 65 GHz has been achieved. At the same time, high quantum efficiency for near-infrared illumination can be obtained by the engineering of optical resonant modes to localize optical energy inside the intrinsic Ge disks. Furthermore, small junction capacitance and the possibility of zero/low bias operation have been shown. Our results show that all-dielectric metasurfaces can improve the performance of photodetectors.

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Hainey, Mel F., Takaaki Mano, Takeshi Kasaya, Tetsuyuki Ochiai, Hirotaka Osato, Kazuhiro Watanabe, Yoshimasa Sugimoto, et al. "Near-field resonant photon sorting applied: dual-band metasurface quantum well infrared photodetectors for gas sensing." Nanophotonics 9, no. 16 (October 8, 2020): 4775–84. http://dx.doi.org/10.1515/nanoph-2020-0456.

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AbstractTwo photodetectors for measuring transmission and two bulky, separated narrowband filters for picking a target gas absorption line and a non-absorbing reference from broadband emission are typically required for dual-band non-dispersive infrared (NDIR) gas sensing. Metal-dielectric-metal (MDM) metasurface plasmon cavities, precisely controllable narrowband absorbers, suggest a next-generation, nanophotonic approach. Here, we demonstrate a dual-band MDM cavity detector that consolidates the function of two detectors and two filters into a single device by employing resonant photon sorting-a function unique to metasurfaces. Two MDM cavities sandwiching a quantum well infrared photodetector (QWIP) with distinct resonance wavelengths are alternately arranged in a subwavelength period. The large absorption cross section of the cavities ensures ~95% efficient lateral sorting of photons by wavelength into the corresponding detector within a near-field region. The flow of incident photons is thus converted into two independent photocurrents for dual-band detection. Our dual-band photodetectors show competitive external quantum efficiencies up to 38% (responsivity 2.1 A/W, peak wavelength 6.9 5m) at 78 K. By tailoring one resonance to an absorption peak of NO2 (6.25 5m) and the other to a non-absorbing reference wavelength (7.15 5m), NDIR NO2 gas sensing with 10 ppm accuracy and 1 ms response times is demonstrated. Through experiment and numerical simulation, we confirm near-perfect absorption at the resonant cavity and suppressed absorption at its non-resonant counterpart, characteristic of resonant photon sorting. Dual-band sensing across the mid-infrared should be possible by tailoring the cavities and quantum well to desired wavelengths.

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26

Zubair, Amna, Muhammad Zubair, Aaron Danner, and Muhammad Qasim Mehmood. "Engineering multimodal spectrum of Cayley tree fractal meta-resonator supercells for ultrabroadband terahertz light absorption." Nanophotonics 9, no. 3 (January 14, 2020): 633–44. http://dx.doi.org/10.1515/nanoph-2019-0391.

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AbstractSelf-similar fractals provide a degree of freedom for varying the resonance frequency due to the multiscale geometric features involved and are an ideal candidate for ultrabroadband absorbing devices – especially in the terahertz (THz) band where there is a lack of natural absorbing materials. Metasurface-based THz absorbers often suffer from poor broadband performance, whereas strongly absorbing broadband devices are typically complex multilayer structures. Here, we numerically demonstrate an ultrabroadband, ultrathin, polarization-insensitive, wide-angle, single-layer planar metasurface THz absorber by integrating different Cayley tree fractal resonators into one supercell based on the frequency shifting and multiresonance bands of different fractal orders. In terms of physics, we have exploited the self-similar nature of fractal geometry to engineer the multimodal spectrum of this system. With increasing fractal order N, an increasing number of modes can be excited with certain degeneracies where each mode corresponds to plasmon oscillations at different geometric scales inside fractal. As a result, broad, multipeaked spectra with large degeneracy numbers can be achieved with larger N. Finally, by placing fractals of different order N into one supercell, the coupling and superposition of the neighboring resonances exhibit the desired ultrabroadband response. The proposed absorber provides a wide incident wave angle with a full-width half-maximum absorption bandwidth of more than one octave, i.e. 3.88 THz. Greater than 80% absorption is achieved over a frequency range of 3 THz. Owing to its performance, this work is a step forward in realizing perfect blackbody absorbers that can be easily integrated with bolometric sensing technology to make high-efficient THz-sensing devices.

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Le Perchec, Jérôme, and Giacomo Badano. "Opaque pixel mask with a broadband absorbing metasurface: application to infrared detectors." Applied Optics 61, no. 2 (January 3, 2022): 330. http://dx.doi.org/10.1364/ao.441792.

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28

Wang, Qiang, Yuan Ke Liu, Gui Chen Wang, Wei Xiang Jiang, and Tie Jun Cui. "Tunable triple-band millimeter-wave absorbing metasurface based on nematic liquid crystal." AIP Advances 12, no. 1 (January 1, 2022): 015127. http://dx.doi.org/10.1063/5.0075606.

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29

Han, Yu, Xiaopeng Wang, Guolin Xie, Xu Tang, and Tianning Chen. "Low-frequency sound-absorbing metasurface with a channel of nonuniform cross section." Journal of Applied Physics 127, no. 6 (February 14, 2020): 064902. http://dx.doi.org/10.1063/1.5119408.

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Sharma, Govindam, Akhlesh Lakhtakia, Somak Bhattacharyya, and Pradip K. Jain. "Magnetically tunable metasurface comprising InAs and InSb pixels for absorbing terahertz radiation." Applied Optics 59, no. 31 (October 23, 2020): 9673. http://dx.doi.org/10.1364/ao.405023.

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Feng, Maochang, Xiaoli Chen, Yongfeng Li, Qiqi Zheng, Yajuan Han, Jieqiu Zhang, Jiafu Wang, et al. "Circularly Polarized Spin‐Selectivity Absorbing Coding Phase Gradient Metasurface for RCS Reduction." Advanced Theory and Simulations 3, no. 3 (January 27, 2020): 1900217. http://dx.doi.org/10.1002/adts.201900217.

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32

Marini, Angelica Viola, Davide Ramaccia, Alessandro Toscano, and Filiberto Bilotti. "Metasurface virtual absorbers: unveiling operative conditions through equivalent lumped circuit model." EPJ Applied Metamaterials 8 (2021): 3. http://dx.doi.org/10.1051/epjam/2020014.

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Virtual absorption concept has been recently introduced as a new phenomenon observed in electromagnetics and optics consisting of theoretically unlimited accumulation of energy within a finite volume of material without dissipation. The anomalous behaviour is achieved by engaging the complex zero scattering eigenmodes of the virtual absorbing system by illuminating it with a proper complex frequency ω = ω r + jω i , whose value is strictly determined by the system characteristics. In this paper, we investigate on the position of the zero-pole scattering pairs in the complex frequency plane as a function of the input impedance of the metasurface-based lossless virtual absorber. We analytically derive the conditions under which a properly modulated monochromatic plane wave can be virtually absorbed by the system and stored within its volume. The analysis is developed by modelling the propagation of a normally impinging plane wave through its equivalent transmission line model terminated in an arbitrary reactive load, which in turn models the input impedance of the metasurface-based system under consideration. The study allows to determine a priori whether the metasurface-based system can support the virtual absorption or not by evaluating the time-constant from its equivalent circuit.

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33

Li, Bingzhen, Yuhua Chen, Qingqing Wu, Yan Li, Yaxing Wei, Jijun Wang, Fangyuan Li, and Xinwei Liu. "Ultrathin Narrowband and Bidirectional Perfect Metasurface Absorber." Coatings 13, no. 8 (July 30, 2023): 1340. http://dx.doi.org/10.3390/coatings13081340.

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The conventional design approaches for achieving perfect absorption of electromagnetic (EM) waves using metasurface absorbers (MSAs) are limited to absorbing waves in one direction while reflecting waves in the other. In this study, a novel ultrathin narrowband MSA with bidirectional perfect absorption properties has been proposed, based on a tri-layer metal square-circular-square patch (SCSP) structure. The simulation results demonstrate that the proposed MSA exhibits a remarkable absorbance of 98.1%, which is consistent with the experimental and theoretical calculations. The equivalent constitutive parameters that were retrieved, as well as the simulated surface current and the power loss density distributions, reveal that the perfect absorption of the designed MSA originates from the fundamental dipolar resonance. Furthermore, the proposed MSA demonstrates stable wide-angle absorption properties for both transverse electric (TE) and transverse magnetic (TM) waves under various oblique incidence angles. The absorption characteristics of the MSA can be fine-tuned by adjusting the structural parameters. Additionally, the proposed MSA boasts excellent ultrathin thickness, bidirectional, polarization-insensitive, and wide-angle properties, making it highly suitable for a range of potential applications such as imaging, detection, and sensing.

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Jeon, Wonju, and Hyeonbin Ryoo. "Dual-frequency sound-absorbing metasurface based on visco-thermal effects with frequency dependence." Journal of the Acoustical Society of America 144, no. 3 (September 2018): 1763. http://dx.doi.org/10.1121/1.5067800.

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Ryoo, H., and W. Jeon. "Dual-frequency sound-absorbing metasurface based on visco-thermal effects with frequency dependence." Journal of Applied Physics 123, no. 11 (March 21, 2018): 115110. http://dx.doi.org/10.1063/1.5017540.

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36

Tian, Jingyi, Hao Luo, Qiang Li, Xuelu Pei, Kaikai Du, and Min Qiu. "Near-Infrared Super-Absorbing All-Dielectric Metasurface Based on Single-Layer Germanium Nanostructures." Laser & Photonics Reviews 12, no. 9 (July 25, 2018): 1800076. http://dx.doi.org/10.1002/lpor.201800076.

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37

Fu, Haiyan, Xinyue Zhao, Patrick Adjei, Zheng Wang, and Xiaoli Wu. "STUDY AND ANALYSIS ON SOUND ABSORBING AND NOISE REDUCING PERFORMANCE OF TIMBER CONSTRUCTION WALL BASED ON ACOUSTIC SPIRAL MATASURFACE." WOOD RESEARCH 66(3) 2021 66, no. 3 (July 20, 2021): 341–52. http://dx.doi.org/10.37763/wr.1336-4561/66.3.341352.

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Based on acoustic spiral metasurface, a spiral structural layer was designed to apply to timber construction interior wall. The sound absorption coefficient was measured by impedance tube method and compared with Helmholtz resonance structural layer, solid structural layer and air layer in traditional wall. The results show that the combination of the spiral structural layer and the wall can optimize the sound absorption performance of the wall in the medium and low frequency. Without reducing the overall sound-absorbing performance of the wall, can achieve perfect sound absorption in some medium and low frequency sound bands.

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Wu, Yutao, Qingxuan Liang, Jin He, Jiaming Feng, and Tianning Chen. "Deep-subwavelength broadband sound absorbing metasurface based on the update finger coiling-up method." Applied Acoustics 195 (June 2022): 108846. http://dx.doi.org/10.1016/j.apacoust.2022.108846.

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Liu, Yunpeng, Lin Dong, Jiangshan Zheng, Mohd Faizul Mohd Sabri, Nazia Abdul Majid, and Suriani Ibrahim. "Switchable absorbing, reflecting, and transmitting metasurface by employing vanadium dioxide on the same frequency." Superlattices and Microstructures 162 (February 2022): 107109. http://dx.doi.org/10.1016/j.spmi.2021.107109.

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Guo, Jingwen, Xin Zhang, Yi Fang, and Ziyan Jiang. "A compact low-frequency sound-absorbing metasurface constructed by resonator with embedded spiral neck." Applied Physics Letters 117, no. 22 (November 30, 2020): 221902. http://dx.doi.org/10.1063/5.0031891.

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Tian, Jingyi, Hao Luo, Qiang Li, Xuelu Pei, Kaikai Du, and Min Qiu. "All-Dielectric Metasurfaces: Near-Infrared Super-Absorbing All-Dielectric Metasurface Based on Single-Layer Germanium Nanostructures (Laser Photonics Rev. 12(9)/2018)." Laser & Photonics Reviews 12, no. 9 (September 2018): 1870039. http://dx.doi.org/10.1002/lpor.201870039.

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Wiest, Tyler, Carolyn Conner Seepersad, and Michael R. Haberman. "Robust design of an asymmetrically absorbing Willis acoustic metasurface subject to manufacturing-induced dimensional variations." Journal of the Acoustical Society of America 151, no. 1 (January 2022): 216–31. http://dx.doi.org/10.1121/10.0009162.

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Sharma, Ankit, Deepak Gangwar, Binod Kumar Kanaujia, and Santanu Dwari. "Gain enhancement and RCS reduction of CP patch antenna using partially reflecting and absorbing metasurface." Electromagnetics 39, no. 2 (February 8, 2019): 120–35. http://dx.doi.org/10.1080/02726343.2019.1577448.

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Lai, Senfeng, Guiyang Liu, Yanpei Guo, and Yang Liu. "Design of an Optically Transparent Microwave Absorber Based on Coding Metasurface." Symmetry 14, no. 10 (October 21, 2022): 2217. http://dx.doi.org/10.3390/sym14102217.

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In this paper, a metamaterial absorber with a checkerboard patterned ITO (indium tin oxide) film as the surface is obtained by using flexible and optically transparent wave-absorbing material ITO–PET (polyethylene terephthalate), and a coding arrangement of two basic coding units based on the APS-PSO (Array Pattern Synthesis -Particle Swarm Optimization) algorithm. The surface structure of the absorber consists of ITO rectangular patch structures and ITO circular patch structures (110 Ω/sq). The ITO rectangular patch structures and ITO circular patch structures are symmetrical. The middle layer is made up of two layers of PET and one layer of PMMA, and the bottom surface is covered with a layer of low square resistance ITO film (8 Ω/sq). The experimental results, which are consistent with the simulation results, show that the absorber has superior performance: over 90% absorptance in the 5.06–9.01 GHz band, high transmittance, and a −10 dBsm RCS (radar cross-section) reduction in the 5.3–8.7 GHz band. This design also has polarization insensitivity and angular stability.

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Lee, Joong Seok, Jun Hyeong Park, Pyung Sik Ma, Shin Young Kim, and Yoon Young Kim. "Enhancement of sound absorption in a band frequency using thin porous layer-lined metasurfaces." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 1 (August 1, 2021): 5097–100. http://dx.doi.org/10.3397/in-2021-2962.

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When a porous layer is installed on a hard wall, sound absorption performance is mainly determined by thickness of the layer. Although material parameters of porous materials are strongly dependent on frequencies, the thickness limitation related to the quarter wavelength of incident sound wave has been a key factor in the treatment of porous layers for noise reduction. This implies that a thicker porous layer is required to absorb lower-frequency sound effectively. To overcome the thickness limitation, metaporous layers, which are named as a compound of sound absorbing porous layers with the concept of metamaterials have received much attentions for alternative implementations of porous layers. Recently, we proposed a new type of metaporous layer for enhancing sound absorption performance in a specified broad frequency band. The proposed metaporous layer is constructed with a thin porous layer backed by a reactive metasurface consisting of an array of bent channels. Formation of sound absorption band is directly determined by the characteristics of scattered sound field from the proposed metaporous layer. Analytical and numerical investigations show that the metasurface is considerably responsible for the enhanced sound absorption in the proposed metaporous layer, while sound dissipation occurs only in the thin porous layer.

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Vafapour, Zohreh. "Cost-Effective Bull’s Eye Aperture-Style Multi-Band Metamaterial Absorber at Sub-THz Band: Design, Numerical Analysis, and Physical Interpretation." Sensors 22, no. 8 (April 9, 2022): 2892. http://dx.doi.org/10.3390/s22082892.

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Theoretical and numerical studies were conducted on plasmonic interactions at a polarization-independent semiconductor–dielectric–semiconductor (SDS) sandwiched layer design and a brief review of the basic theory model was presented. The potential of bull’s eye aperture (BEA) structures as device elements has been well recognized in multi-band structures. In addition, the sub-terahertz (THz) band (below 1 THz frequency regime) is utilized in communications and sensing applications, which are in high demand in modern technology. Therefore, we produced theoretical and numerical studies for a THz-absorbing-metasurface BEA-style design, with N-beam absorption peaks at a sub-THz band, using economical and commercially accessible materials, which have a low cost and an easy fabrication process. Furthermore, we applied the Drude model for the dielectric function of semiconductors due to its ability to describe both free-electron and bound systems simultaneously. Associated with metasurface research and applications, it is essential to facilitate metasurface designs to be of the utmost flexible properties with low cost. Through the aid of electromagnetic (EM) coupling using multiple semiconductor ring resonators (RRs), we could tune the number of absorption peaks between the 0.1 and 1.0 THz frequency regime. By increasing the number of semiconductor rings without altering all other parameters, we found a translation trend of the absorption frequencies. In addition, we validated our spectral response results using EM field distributions and surface currents. Here, we mainly discuss the source of the N-band THz absorber and the underlying physics of the multi-beam absorber designed structures. The proposed microstructure has ultra-high potentials to utilize in high-power THz sources and optical biomedical sensing and detection applications based on opto-electronics technology based on having multi-band absorption responses.

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Umul, Yusuf Ziya. "Diffraction of electromagnetic waves by a planar interface between perfectly absorbing and anomalously transmitting metasurface half-planes." Optik 179 (February 2019): 173–81. http://dx.doi.org/10.1016/j.ijleo.2018.10.206.

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Aliannejad, Fatemeh, Esmaeel Tahanian, Mansoor Fateh, and Mohsen Rezvani. "A Reinforcement Learning-Based Configuring Approach in Next-Generation Wireless Networks Using Software-Defined Metasurface." Security and Communication Networks 2021 (April 26, 2021): 1–13. http://dx.doi.org/10.1155/2021/5587656.

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The next generation of wireless networks including Five and Six Generations ( 5 G and 6 G ) can provide very high data rates as a demand for the Internet of Everything (IoE) system which connects millions of people and billions of machines. To reach such a high data rate, the wireless networks should work at high enough frequencies, such as millimeter and THz bands, which in turn suffer from a large attenuation and acute multipath fading. The idea of coating any objects in the environment with Software-Defined Metasurfaces (SDMs) was presented to control these effects by managing the electromagnetic properties of the environment. Since the programmable environment can be changed during the communication, for example, a sudden obstacle appears, this management should be adaptive. This paper presents the use of a reinforcement learning (RL) algorithm for dynamically configuring such an environment. In other words, when a change happens in the environment, for example, an obstacle blocks some EM waves, the agent receives a large punishment, and therefore a new action is selected. In our model, the transmitted electromagnetic waves and the tiles are considered as the agents and states, respectively. Moreover, the actions of each tile include absorbing or reflecting the impinging waves in a specific direction. We utilize the Q-learning technique to establish proper wireless links between the users and the access point (AP) by controlling the state of the tiles in an environment covered by the SDMs. Evaluation of the proposed model for different scenarios, including emerging sudden obstacles, indicates its potential to provide a proper signal level for all the users and improve the average received power up to 12 % in comparison with the related works.

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Sun Yuwei, 孙雨威, 贺楠 He Nan, 张智 Zhang Zhi, 徐西南 Xu Xinan, 杨柳 Yang Liu, 金毅 Jin Yi, 邢宇心 Xing Yuxin, and 何赛灵 He Sailing. "吸波超表面及其在中红外波段的应用." Acta Optica Sinica 42, no. 17 (2022): 1704001. http://dx.doi.org/10.3788/aos202242.1704001.

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Xie, Tong, Dingbo Chen, Huiping Yang, Yanhong Xu, Zhenrong Zhang, and Junbo Yang. "Tunable Broadband Terahertz Waveband Absorbers Based on Fractal Technology of Graphene Metamaterial." Nanomaterials 11, no. 2 (January 20, 2021): 269. http://dx.doi.org/10.3390/nano11020269.

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In this paper, a metasurface Terahertz absorber based on the fractal technology of a graphene geometry resonator to realize ultra-wideband, ultrathin, adjustable double-layer cross-fractal formation is introduced. This paper proposes a dynamically tuned graphene absorbing material. The structure is composed of one- to four-level-fractal graphene pattern layers, MgF2 layers and metal reflective layers to form a two-sided mirror of an asymmetric Fabry–Perot cavity. To confine the terahertz electromagnetic wave, four different fractals are integrated into a supercell, and the coupling and superposition of adjacent resonant cavities form a broadband high-absorption absorber. Using finite element-based full-wave electromagnetic simulation software to simulate the response frequency of 0.4–2.0 THz, we found that the absorber achieves a broadband 1.26 THz range (absorption > 80%) and a relative bandwidth of 106.8%. By adjusting the Fermi energy, it can realize free switching and expand to wider broadband terahertz absorption, by adjusting the polarization angle (Φ) from 0 to 90° to prove that the structure is not sensitive to polarization, the absorber provides a 60° large angle of incidence, polarization for TE and TM the absorption pattern remains basically the same. Compared with the previous work, our proposed structure uses fractal technology to expand the bandwidth and provide dynamic adjustable characteristics with great degrees of freedom. The appearance of the fractal structure reduces the difficulty of actual processing.

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