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Artykuły w czasopismach na temat „METAMATERIAL REFLECTOR”

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Data publikacji: 11 września 2023

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1

Huang, Wei, Ningye He, Renxia Ning i Zhenhai Chen. "Wideband Reflector and Analogue Electromagnetically Induced Reflection in Metamaterials". Crystals 11, nr 8 (19.08.2021): 985. http://dx.doi.org/10.3390/cryst11080985.

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Metamaterials are highly demanded for advanced applications in absorbers, sensors, and filters. However, metamaterial reflectors, especially broadband reflectors, remain challenging. In this paper, we theoretically investigate a wideband metamaterial reflector which consists of cross shaped graphene strips and a silica (SiO2) substrate. The cross shaped graphene strips are coated on the top of the structure, and the cross shape rotated 45° graphene strips are spun on the bottom of it. The calculated reflection can be tuned through length and width of the graphene strips. By comparison, not only broadband reflection but also analogue electromagnetically induced reflection (EIR) can be realized. Moreover, the structure can generate a bi-directional broadband reflection of insensitive polarization. This kind of bi-directional reflector at microwave frequencies is obtained because the top and bottom graphene strip structures are similar. We employ the electric field distribution of the designed structure to elucidate the mechanism of the analogue EIR effect. We further discuss the influence of incident angle on the analogue EIR effect. Such a bi-directional reflector can be potentially applied to a wideband reflector, antenna, and sensor.

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2

Zhao, Zhen-Yu, Hai-Wen Liu, Zhi-Jiao Chen, Liang Dong, Le Chang i Meng-Ying Gao. "Dual circularly polarized Fabry-Perot antenna with metamaterial-based corner reflector for high gain and high aperture efficiency". Acta Physica Sinica 71, nr 4 (2022): 044101. http://dx.doi.org/10.7498/aps.71.20211914.

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Based on the ray-tracing model, a new method of achieving a high gain and high aperture efficiency Fabry-Perot antenna with metamaterial-based corner reflector is proposed. The proposed Fabry-Perot antenna is composed of a dual circularly polarized patch antenna feed and the metamaterial-based corner reflector. The metamaterial-based corner reflector consists of four phase correction metasurfaces and a partially reflective surface. First, theory and analysis of the Fabry-Perot antenna with metamaterial-based corner reflector are presented. Then, the performances of the dual circularly polarized antenna feed, the traditional Fabry-Perot antenna, and the Fabry-Perot antenna with metamaterial-based corner reflector are compared among each other and analyzed. Finally, the proposed Fabry-Perot antenna is fabricated and measured. The measured left-hand circular polarization (LHCP) gain and the measured right-hand circular polarization (RHCP) gain of the proposed Fabry-Perot antenna are 21.4 dBi and 21.3 dBi, respectively. Comparing with the antenna feed, the LHCP gain and RHCP gain of the proposed Fabry-Perot antenna are enhanced by 16.4 dB and 16.3 dB, respectively. Compared with the traditional Fabry-Perot antenna, the metamaterial-based corner reflector acts as both a reflection surface and a phase correction surface. It manipulates the propagation direction and phase of electromagnetic wave. The proposed Fabry-Perot antenna with high gain, high aperture efficiency and low sidelobe at 2.8 GHz paves the way for developing the solar radio telescope and conducting the observation.

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3

BOURAS, Khedidja, Abdelhadi LABIAD, Chaker SALEH i Mouloud BOUZOUAD. "Emulation of metamaterial waveguides". Algerian Journal of Signals and Systems 3, nr 3 (15.09.2018): 117–24. http://dx.doi.org/10.51485/ajss.v3i3.67.

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In this work, we are interested by emulating metamaterial microwave waveguides which behave like conventional metallic ones. We use metamaterial layers based on two types of unit cells. The first one is a connected cross type unit cell which leads to a metamaterial with a near zero refraction index (n1≈ 0). The second one is a disconnected cross type unit cell which leads to a metamaterial with a refraction index greater than unity (n2 >1). With these two type of metamaterials we can define, in the metamaterial layer, different sections each one can have a refraction index equal to n1 or n2. Using these metamaterial layers we can build a metamaterial waveguide. This latter is obtained by stacking a number of layers. The waveguide is obtained by selecting an inner section with a refraction index n2 and an outer section with a refraction index n1 close to zero which plays a similar role as a metallic reflector to form the waveguide.

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4

McSherry, Sean, i Andrej Lenert. "Design of a gradient epsilon-near-zero refractory metamaterial with temperature-insensitive broadband directional emission". Applied Physics Letters 121, nr 19 (7.11.2022): 191702. http://dx.doi.org/10.1063/5.0122535.

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Gradient epsilon-near-zero (ENZ) metamaterials offer broadband directional control over thermal emission. Implementing this approach using materials that remain stable in harsh thermo-chemical environments would allow it to be broadly deployed in thermal photonics. Our prior work showed that heterostructures of rock salt MgO and perovskite BaZr0.5Hf0.5O3 (BZHO) are stable up to 1100 °C in air, with no discernible intermixing. In this work, we design a gradient ENZ metamaterial made from three lattice-matched refractory oxides: MgO, BZHO, and NiO. The miscibility of MgO and NiO makes it possible to linearly vary the ENZ frequency of the metamaterial layers. BZHO is used as a thin, interlayer diffusion barrier. We model the emissivity of our gradient ENZ metamaterial at 25 and 1000 °C to demonstrate that the spectral bandwidth of directional emission is preserved at high temperatures despite changes in the optical properties of each material. Finally, we discuss practical fabrication challenges associated with the back reflector and offer potential solutions based on advancements in hetero-integration. Overall, this work shows a pathway toward gradient ENZ metamaterials with ultrahigh-temperature stability.

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5

Mustapha, M. G., M. K. A. Rahim, N. A. Murad, O. Ayop, S. Tuntrakool, M. A. Baba, A. Y. Iliyasu i Mohd Ezwan Jalil. "Polarization insensitive switchable metamaterial absorber/reflector for X-band applications". Bulletin of Electrical Engineering and Informatics 9, nr 6 (1.12.2020): 2443–48. http://dx.doi.org/10.11591/eei.v9i6.2196.

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A unit cell of squared shaped polarization-insensitive switchable metamaterial absorber/reflector is presented. The structure operates at 10.20 GHz under both absorber mode and reflector mode configurations. Copper wire bridging the gaps to form a circular shape structure were used as switches for operation mode selections. The structure was designed on an FR4 substrate, and the incidental wave angles were varied from 0 to 50 degrees. The structure demonstrated almost 100% absorption at resonance, 3.314 GHz percentage bandwidth at 80% as an absorber. On the other hand, as reflector, it demonstrated almost a 90% reflection and a usable bandwidth of 3.327 GHz.

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6

Xu, Wangren, i Sameer Sonkusale. "Microwave diode switchable metamaterial reflector/absorber". Applied Physics Letters 103, nr 3 (15.07.2013): 031902. http://dx.doi.org/10.1063/1.4813750.

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7

Deng, Guangsheng, Tianyu Xia, Jun Yang, Longzhen Qiu i Zhiping Yin. "Tunable terahertz metamaterial with a graphene reflector". Materials Research Express 3, nr 11 (15.11.2016): 115801. http://dx.doi.org/10.1088/2053-1591/3/11/115801.

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8

Aközbek, N., M. J. Bloemer i M. Scalora. "Experimental investigation of a metamaterial omnidirectional reflector". Journal of Applied Physics 104, nr 3 (sierpień 2008): 033105. http://dx.doi.org/10.1063/1.2963479.

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9

Lu, Taoming, Youcheng Wang, Helin Yang, Xiaojun Huang, Yanfei Zhou i Jiong Wu. "Absorbing properties of metamaterial dihedral corner reflector". Materials Research Express 7, nr 2 (24.02.2020): 025802. http://dx.doi.org/10.1088/2053-1591/ab7567.

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10

Hedayati, M. Keshavarz, S. Fahr, C. Etrich, F. Faupel, C. Rockstuhl i M. Elbahri. "The hybrid concept for realization of an ultra-thin plasmonic metamaterial antireflection coating and plasmonic rainbow". Nanoscale 6, nr 11 (2014): 6037–45. http://dx.doi.org/10.1039/c4nr00087k.

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11

Yang, Guishuang, Fengping Yan, Xuemei Du, Ting Li, Wei Wang, Yuling Lv, Hong Zhou i Yafei Hou. "Tunable broadband terahertz metamaterial absorber based on vanadium dioxide". AIP Advances 12, nr 4 (1.04.2022): 045219. http://dx.doi.org/10.1063/5.0082295.

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The special electromagnetic properties of metamaterials have contributed to the development of terahertz technology, and terahertz broadband absorbers for various applications have been investigated. The design of metamaterial absorbers with tunability is in a particularly attractive position. In this work, a tunable broadband terahertz metamaterial absorber is proposed based on the phase transition material vanadium dioxide (VO2). The simulation results show that an excellent absorption bandwidth reaches 3.78 THz with the absorptivity over 90% under normal incidence. The absorptivity of the proposed structure can be dynamically tuned from 2.7% to 98.9% by changing the conductivity of VO2, which changes the structure from a perfect reflector to an absorber. An excellent amplitude modulation with the absorptivity is realized. The mechanism of broadband absorption is explored by analyzing the electric field distribution of the absorber based on impedance matching theory. In addition, it also has the advantage of polarization and incident angle insensitivity. The proposed absorber may have a wide range of promising applications in areas such as terahertz imaging, sensing, and detection.

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12

Marcus, Sherman W. "Antenna reflector emulation by simplified metamaterial-coated plates". Journal of Electromagnetic Waves and Applications 28, nr 17 (26.09.2014): 2210–27. http://dx.doi.org/10.1080/09205071.2014.959621.

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13

Zhu, Bo, Yijun Feng, Junming Zhao, Ci Huang, Zhengbin Wang i Tian Jiang. "Polarization modulation by tunable electromagnetic metamaterial reflector/absorber". Optics Express 18, nr 22 (19.10.2010): 23196. http://dx.doi.org/10.1364/oe.18.023196.

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14

Wang Jianyang, 王建扬, i 吴倩楠 Wu Qiannan. "Metamaterial Terahertz Broadband Reflector with Double-Layer Grid". Chinese Journal of Lasers 47, nr 6 (2020): 0614002. http://dx.doi.org/10.3788/cjl202047.0614002.

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15

Sun, Kai, Christoph A. Riedel, Alessandro Urbani, Mirko Simeoni, Sandro Mengali, Maksim Zalkovskij, Brian Bilenberg, C. H. de Groot i Otto L. Muskens. "VO2 Thermochromic Metamaterial-Based Smart Optical Solar Reflector". ACS Photonics 5, nr 6 (16.04.2018): 2280–86. http://dx.doi.org/10.1021/acsphotonics.8b00119.

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16

Keshavarz, Afsaneh, i Zohreh Vafapour. "Sensing Avian Influenza Viruses Using Terahertz Metamaterial Reflector". IEEE Sensors Journal 19, nr 13 (1.07.2019): 5161–66. http://dx.doi.org/10.1109/jsen.2019.2903731.

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17

Ankit, Kamal Kishor i Ravindra Kumar Sinha. "Design and analysis of wavelength tunable metamaterial reflector". Results in Optics 10 (luty 2023): 100366. http://dx.doi.org/10.1016/j.rio.2023.100366.

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18

Guo, Tian-Long, Fangfang Li i Matthieu Roussey. "Dielectric Cavity-Insulator-Metal (DCIM) Metamaterial Absorber in Visible Range". Nanomaterials 13, nr 8 (18.04.2023): 1401. http://dx.doi.org/10.3390/nano13081401.

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For many years, metamaterial absorbers have received much attention in a wide range of application fields. There is an increasing need to search for new design approaches that fulfill more and more complex tasks. According to the specific application requirements, design strategy can vary from structure configurations to material selections. A new combination of a dielectric cavity array, dielectric spacer, and gold reflector as a metamaterial absorber is proposed and theoretically studied in this work. The complexity of the dielectric cavities leads to a more flexible optical response than traditional metamaterial absorbers. It gives a new dimension of freedom for a real three-dimensional metamaterial absorber design.

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19

Gaspari, M., S. Mengali, M. Simeoni, A. Urbani, O. L. Muskens, K. Sun, I. Zeimpekis i in. "Metamaterial-based smart and flexible Optical Solar Reflectors". IOP Conference Series: Materials Science and Engineering 1287, nr 1 (1.08.2023): 012003. http://dx.doi.org/10.1088/1757-899x/1287/1/012003.

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Abstract In the frame of projects funded by the European Commission and the ESA, we developed a new type of Optical Solar Reflector (OSR) that combines the flexibility and easy handling of Second Surface Mirrors with the temperature-variable emittance necessary to ensure both effective radiative cooling in the hot phase and reduced heat losses in the cold phase. The new smart OSR consists of a metamaterial coating deposited on Kapton film. The coating is made of two functional blocks, namely a variable emitter topped by a dielectric solar reflector. The variable emitter is a Metamaterial Perfect Absorber designed for strong and broadband plasmonic resonance absorption in the thermal IR. It consists of a metal back-reflector, a dielectric spacer, and an array of doped VO2 thermochromic micro-antennas that are switched-off when the temperature drops below the metal-to-insulator transition point. The solar reflector is a wideband dielectric filter made of materials that are transparent across the entire spectrum from the VIS to the thermal IR. All the layers of the two blocks are deposited by standard vacuum techniques, while the array is patterned by Nanoimprint Lithography, a technique that is often performed at the wafer level but allows for up-scaling via roll-to-roll or roll-to-plate production setups. The paper reports on the characterization and testing of samples of size up to 100 mm x 100 mm, at the Beginning of Life and after thermal, humidity, irradiation and handling tests.

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20

Singh, Jaget, i Fateh Lal Lohar. "Metamaterial-Based Miniaturized DGS Antenna for wireless Applications". IOP Conference Series: Materials Science and Engineering 1225, nr 1 (1.02.2022): 012035. http://dx.doi.org/10.1088/1757-899x/1225/1/012035.

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Abstract In this article, metamaterial based miniaturized DGS (Defective Ground Structure) antenna is presented. Initially conventional antenna is designed for 2.4 GHz and by using DGS method, the same conventional antenna size is reduced upto 50% of initial design. But antenna gain down due to DGS in antenna structure. By using metamaterial as a reflector, the antenna gain can be enhanced. The antenna and metamaterial are designed on Rogers RT5880 and Teflon Ceramic TF-1/2 (εr = 10.2, tanδ = 0.001) respectively. All simulation results are carried out by using EM simulator CST software and for the operating frequency of 2.415 GHz a gain of 6.28dB is observed.

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21

Yang, Rongcao, Jianping Xu, Jiayun Wang, Runbo Ma i Wenmei Zhang. "Frequency-reconfigurable metamaterial absorber/reflector with eight operating modes". Optics Express 27, nr 12 (29.05.2019): 16550. http://dx.doi.org/10.1364/oe.27.016550.

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22

Gregory, Micah D., Jeremy A. Bossard, Zachary C. P. O. Morgan, Cooper S. Cicero, John A. Easum, John D. Binion, Danny Z. Zhu i in. "A Low Cost and Highly Efficient Metamaterial Reflector Antenna". IEEE Transactions on Antennas and Propagation 66, nr 3 (marzec 2018): 1545–48. http://dx.doi.org/10.1109/tap.2017.2781151.

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23

Molaei, Ali, Juan Heredia Juesas, William J. Blackwell i Jose Angel Martinez-Lorenzo. "Interferometric Sounding Using a Metamaterial-Based Compressive Reflector Antenna". IEEE Transactions on Antennas and Propagation 66, nr 5 (maj 2018): 2188–98. http://dx.doi.org/10.1109/tap.2018.2809488.

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24

Zhu, Bo, Yijun Feng, Junming Zhao, Ci Huang i Tian Jiang. "Switchable metamaterial reflector/absorber for different polarized electromagnetic waves". Applied Physics Letters 97, nr 5 (2.08.2010): 051906. http://dx.doi.org/10.1063/1.3477960.

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25

So, Hideya, i Kazuki Maruta. "Directional Antenna With Lightweight Metamaterial Reflector for UAV-Based Networks". IEEE Access 9 (2021): 78735–41. http://dx.doi.org/10.1109/access.2021.3084235.

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26

Hoque, Ahasanul, Mohammad Tariqul Islam, Ali F. Almutairi i Muhammad E. H. Chowdhury. "DNG Metamaterial Reflector Using SOCT Shaped Resonator for Microwave Applications". IEEE Access 9 (2021): 59148–59. http://dx.doi.org/10.1109/access.2021.3071472.

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27

Moitra, Parikshit, Brian A. Slovick, Zhi Gang Yu, S. Krishnamurthy i Jason Valentine. "Experimental demonstration of a broadband all-dielectric metamaterial perfect reflector". Applied Physics Letters 104, nr 17 (28.04.2014): 171102. http://dx.doi.org/10.1063/1.4873521.

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28

Jose, Jovia, Sikha K. Simon, Joe Kizhakooden, Anju Sebastian, Sreedevi P. Chakyar, Nees Paul, Bindu C, Jolly Andrews i V. P. Joseph. "Frequency-dependent radiation properties of negative permittivity metamaterial reflector antenna". Physica Scripta 94, nr 10 (7.08.2019): 105811. http://dx.doi.org/10.1088/1402-4896/ab2655.

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29

Li, Fengxia, Haiyan Chen, Linbo Zhang, Yang Zhou, Jianliang Xie, Longjiang Deng i Vincent G. Harris. "Compact High-Efficiency Broadband Metamaterial Polarizing Reflector at Microwave Frequencies". IEEE Transactions on Microwave Theory and Techniques 67, nr 2 (luty 2019): 606–14. http://dx.doi.org/10.1109/tmtt.2018.2881967.

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30

Yuan, Chen, Rongcao Yang, Jiayun Wang i Jinping Tian. "Tunable enhanced bandwidth all-graphene -dielectric terahertz metamaterial absorber/reflector". Optik 224 (grudzień 2020): 165517. http://dx.doi.org/10.1016/j.ijleo.2020.165517.

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31

Cao, BinZhao, YuRong Li, Xin Liu, HongMing Fei, MingDa Zhang i YiBiao Yang. "Switchable broadband metamaterial absorber/reflector based on vanadium dioxide rings". Applied Optics 59, nr 27 (14.09.2020): 8111. http://dx.doi.org/10.1364/ao.397671.

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32

Rahamim, Efi, David Rotshild i Amir Abramovich. "Performance Enhancement of Reconfigurable Metamaterial Reflector Antenna by Decreasing the Absorption of the Reflected Beam". Applied Sciences 11, nr 19 (27.09.2021): 8999. http://dx.doi.org/10.3390/app11198999.

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In this study, a new concept for a Ka-band 5G communication tunable reflector metasurface (MS) for beam steering at 28 GHz is proposed. Varactor diodes are used as the tunability component of each unit cell of this MS. Significant improvements in beam steering and bandwidth performance were achieved using this new concept referred to as the stripes configuration. Several different geometries of unit cells arranged in stripes were designed to achieve better performance in directionality, gain, sidelobe level (SLL), and bandwidth in the stripes configuration. Simulation results for a three-stripe MS with different unit cells in each stripe showed better performance in the phase dynamic range and reduced reflectance losses compared to a typical one-stripe MS. The simulation results showed a significant improvement of 3 dB, depending on the steering angle in reflectance gain, compared to a uniform MS (one stripe). Furthermore, a significant improvement of approximately 50% in the accuracy of the steering angle for different operating frequencies was demonstrated. Manufacturing considerations are discussed in this study.

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33

Ahdi Rezaeieh, S., Marco A. Antoniades i Amin M. Abbosh. "Miniaturization of Planar Yagi Antennas Using Mu-Negative Metamaterial-Loaded Reflector". IEEE Transactions on Antennas and Propagation 65, nr 12 (grudzień 2017): 6827–37. http://dx.doi.org/10.1109/tap.2017.2758174.

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34

Dhar, Arup, Mrinmoyee Choudhuri, Arijit Bardhan Roy, Pritam Banerjee i Avra Kundu. "Metamaterial Mirror as Back Reflector for Thin Silicon Solar Cell Application". Materials Today: Proceedings 5, nr 11 (2018): 23203–9. http://dx.doi.org/10.1016/j.matpr.2018.11.051.

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35

Gritsenko, Dmitry, i Roberto Paoli. "Theoretical Optimization of Trapped-Bubble-Based Acoustic Metamaterial Performance". Applied Sciences 10, nr 16 (18.08.2020): 5720. http://dx.doi.org/10.3390/app10165720.

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Acoustic metamaterials have proven to be a versatile tool for the precise control and manipulation of sound waves. One of the promising designs of acoustic metamaterials employ the arrays of bubbles and find applications for soundproofing, blast mitigation, and many others. An obvious advantage of bubble-based metamaterials is their ability to be relatively thin while absorbing low-frequency sound waves. The vast majority of theories developed to predict resonant behavior of bubble-based metamaterials capitalize on Minnaert frequency. Here, we propose a novel theoretical approach to characterize bubble-based metamaterials that are based on our previous findings for a single bubble trapped in circular cavity modeled as a thin clamped plate. We obtain analytical expressions for resonant frequencies of bubble metascreens using self-consistent approximation. Two geometry factors, distance between bubble centers and distance between bubble center and interface of acoustic impedance change, are taken into account. We demonstrate the existence of multiple bandgaps and possibility of switching between them via adjustment of geometry parameters and reflector properties.

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36

Ищенко, Е. А., Ю. Г. Пастернак, В. А. Пендюрин i С. М. Фёдоров. "HALF-WAVE DIPOLE WITH AN ACTIVE REFLECTOR BASED ON OPTO-CONTROLLED METAMATERIAL". ВЕСТНИК ВОРОНЕЖСКОГО ГОСУДАРСТВЕННОГО ТЕХНИЧЕСКОГО УНИВЕРСИТЕТА, nr 4 (20.10.2021): 71–80. http://dx.doi.org/10.36622/vstu.2021.17.4.010.

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Для обеспечения радиосвязи применяются различные конструкции антенн, которые могут обладать всенаправленными или узконаправленными диаграммами направленности, при этом наибольшей защитой канала связи от помех и от перехвата обладают направленные антенны. Но их недостатком является то, что для обеспечения связи во всех направлениях требуется или установка группы антенн, или использование поворотных платформ, которые ухудшают показатели надежности системы, а также усложняют ее. Поэтому, как правило, для обеспечения связи применяют всенаправленные антенны, которые имеют диаграмму направленности в виде тороида. Недостаткaми таких антенн являются малый коэффициент направленного действия, а также прием большого числа шумов, что усложняет последующую обработку сигналов. Предлагается конструкция дипольной антенны, помещенной в активный метаматериал, с возможностью формирования луча путем коммутации слоев конструкции, что формирует динамически перестраиваемые рефлекторы. Получаемые в процессе функционирования системы диаграммы направленности обладают высокими значениями КНД, а также высокой помехозащищённостью и защитой от перехвата ввиду направленных свойств. Была получена конструкция антенны, помещенная в кубическую структуру активного метаматериала, с возможностью коммутации проводников с использованием pin-диодов или МЭМС-коммутаторов, что позволяет обеспечить быстрое переключение режимов работы устройства, формирование направленного луча и обеспечение помехозащищенной и защищенной от перехвата связи To ensure radio communication, various antenna designs are used, which can have omnidirectional or narrowly directional radiation patterns, while directional antennas have the greatest protection of the communication channel from interference and interception. However, their disadvantage is that to ensure communication in all directions, either the installation of a group of antennas or the use of turntables are required, which degrade the reliability of the system, as well as complicate it. Therefore, as a rule, to provide communication, omnidirectional antennas are used, which have a radiation pattern in the form of a toroid. The disadvantage of such antennas is, as a rule, a small directional coefficient, as well as the reception of a large number of noises, which complicates the subsequent signal processing. In this work, we propose a design of a dipole antenna placed in an active metamaterial with the possibility of forming a beam by switching the layers of the structure, which forms dynamically tunable reflectors. Directional patterns obtained in the course of system operation have high directivity values, as well as high noise immunity and protection against interception due to directional properties. As a result of the study, we obtained an antenna design, placed in a cubic structure of an active metamaterial with the possibility of switching conductors using pin diodes or MEMS switches, which allows for fast switching of device operating modes, formation of a directed beam and providing noise-immune and interception-proof communication

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So, Hideya, i Kazuki Maruta. "Sector Design Using Multiband Antenna With Metamaterial Reflector for Cellular UAV System". IEEE Access 10 (2022): 4924–33. http://dx.doi.org/10.1109/access.2022.3140780.

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Molaei, Ali, Juan Heredia-Juesas, Galia Ghazi, James Vlahakis i Jose Angel Martinez-Lorenzo. "Digitized Metamaterial Absorber-Based Compressive Reflector Antenna for High Sensing Capacity Imaging". IEEE Access 7 (2019): 1160–73. http://dx.doi.org/10.1109/access.2018.2881103.

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Pandey, Girijesh Narayan, Narendra Kumar, Pawan Singh, K. B. Thapa, Sonika i Vanshika Singhania. "Tunable Reflection Properties and Photonic Bandgap Behavior of a One-Dimensional Metamaterial-Superconductor-Based Ternary Photonic Crystal". IOP Conference Series: Materials Science and Engineering 1263, nr 1 (1.10.2022): 012002. http://dx.doi.org/10.1088/1757-899x/1263/1/012002.

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In the present communication, we have investigated the tunable reflection properties and photonic bandgap variation of a one-dimensional metamaterial and superconductor based ternary photonic crystal. To design the 1D ternary photonic crystal, we have taken three alternate layers of metamaterial, superconductor (BSSCO), and silica (SiO2). Transfer matrix method (TMM) is employed to determine the optical reflection properties of the considered 1DPC for TE-mode by varying five parameters, viz. incident angle, superconductor temperature, thickness and refractive index of dielectric layer, and number of unit cells. It is noted that the ternary PC exhibits the features of tunable narrow band reflector, whose width increases with increase in the incident angle with a blue shift, and decreases with operating temperature of superconductor with red shift. It also enhances with increase in the dielectric layer thickness in low frequency region, and decreases in high frequency regime with red shifts. We obtain only one PBG at n3=1.46 in low frequency regime, while with increase in the refractive index multiple gaps are obtained in different frequency regions having distinct widths at n3=2.4 and 3.4. An increase in the number of unit cells causes increase in the reflectance, wherein no PBG is found below N=8. This analysis gives some insights to design tunable devices based on narrowband reflectivity in the terahertz frequency regime, including THz-metadevices, emitters, thermo-optical devices, and security sensors.

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Gajibo, M. M., M. K. A. Rahim, N. A. Murad, O. Ayop i H. A. Majid. "Switchable Wideband Metamaterial Absorber and AMC reflector for X-band Applications and Operations". TELKOMNIKA (Telecommunication Computing Electronics and Control) 16, nr 4 (1.08.2018): 1535. http://dx.doi.org/10.12928/telkomnika.v16i4.9065.

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Zhou, Wenjie, Zizhuo Liu, Ziyin Huang, Haixin Lin, Devleena Samanta, Qing-Yuan Lin, Koray Aydin i Chad A. Mirkin. "Device-quality, reconfigurable metamaterials from shape-directed nanocrystal assembly". Proceedings of the National Academy of Sciences 117, nr 35 (17.08.2020): 21052–57. http://dx.doi.org/10.1073/pnas.2006797117.

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Anchoring nanoscale building blocks, regardless of their shape, into specific arrangements on surfaces presents a significant challenge for the fabrication of next-generation chip-based nanophotonic devices. Current methods to prepare nanocrystal arrays lack the precision, generalizability, and postsynthetic robustness required for the fabrication of device-quality, nanocrystal-based metamaterials [Q. Y. Lin et al. Nano Lett. 15, 4699–4703 (2015); V. Flauraud et al., Nat. Nanotechnol. 12, 73–80 (2017)]. To address this challenge, we have developed a synthetic strategy to precisely arrange any anisotropic colloidal nanoparticle onto a substrate using a shallow-template-assisted, DNA-mediated assembly approach. We show that anisotropic nanoparticles of virtually any shape can be anchored onto surfaces in any desired arrangement, with precise positional and orientational control. Importantly, the technique allows nanoparticles to be patterned over a large surface area, with interparticle distances as small as 4 nm, providing the opportunity to exploit light–matter interactions in an unprecedented manner. As a proof-of-concept, we have synthesized a nanocrystal-based, dynamically tunable metasurface (an anomalous reflector), demonstrating the potential of this nanoparticle-based metamaterial synthesis platform.

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Gajibo, M. M., M. K. A. Rahim, N. A. Murad, O. Ayop, H. A. Majid, M. Aminu-Baba i R. Dewan. "Entire X-band region metamaterial absorber and reflector with a microstrip patch switch for X-band applications". Indonesian Journal of Electrical Engineering and Computer Science 15, nr 3 (1.09.2019): 1452. http://dx.doi.org/10.11591/ijeecs.v15.i3.pp1452-1457.

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<span>A metamaterial structure capable of operating as a wide band absorber as well as an AMC reflector is presented in this report. A microstrip patch copper was used as a switch to switch between the two modes. An FR4 substrate was used and the incidental wave angles were varied from 0<sup>0</sup> to 60<sup>0</sup>. Simulations results showed that the absorber was able achieve 96% absorption at 13.05 GHz and 100% absorption at 10.00 GHz and 12.00 GHz. Furthermore, it archived over 85% absorption for the entire X-band frequency range. The AMC reflector also was able to achieve 84.97%, 82.88% and 78.69% for incident angles 0<sup>0</sup>, 20<sup>0 </sup>and 40<sup>0</sup> respectively. Unfortunately, the structure is polarization sensitive.</span>

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Awan, Z. A. "Scattering characteristics of a chiral-coated cylindrical reflector embedded in a double-negative metamaterial". Journal of Modern Optics 63, nr 7 (23.09.2015): 660–68. http://dx.doi.org/10.1080/09500340.2015.1089330.

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Krishna Prasad, N. V., T. A. Babu, S. Phanidhar, R. S. Singampalli, B. R. Naik, M. S. S. R. K. N. Sarma i S. Ramesh. "POTENTIAL APPLICATIONS OF METAMATERIALS IN ANTENNA DESIGN, CLOAKING DEVICES, SENSORS AND SOLAR CELLS: A COMPREHENSIVE REVIEW". Journal of Optoelectronic and Biomedical Materials 13, nr 2 (kwiecień 2021): 23–31. http://dx.doi.org/10.15251/jobm.2021.132.23.

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This paper reviewed some of the applications of metamaterials in antenna design, cloaking devices, sensors and solar cells in brief. Metamaterials can be used as environment or as part of the antenna. Based on the required parameters, metamaterials while designing antennas are used in various types. They are highly useful in enhancing the power gain, bandwidth, in creating dense and antennas of multiple frequencies. Usage of metamaterial in antenna require proper designing of unit cell. This require creation of cells with special properties at required frequency. Cloaking is a technique of making specific objects invisible. This was achieved by isolating electromagnetic waves in that region. This paper reviewed some of the cloaking devices that use the technique of coordinate transformation and scattering cancellation. Metamaterial sensors which are more efficient than sensors with traditional materials are reviewed. These sensors exhibit enhanced sensitivity. Sensors used in wave guides and liquid chemical detection were reviewed. Solar cells that use metamaterials were reviewed. Usage of these materials reduce the loss in solar radiation making the solar cell more efficient based on the design. Recent design in solar cells concentrate on obtaining maximum reflection through usage of back reflectors and increased absorption

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Du, Xuemei, Fengping Yan, Wei Wang, Luna Zhang, Zhuoya Bai, Hong Zhou i Yafei Hou. "A Broadband Switchable Metamaterial Absorber/Reflector Based On Multi-Laps Graphene Sheets in the Terahertz Band". IEEE Photonics Journal 13, nr 5 (październik 2021): 1–8. http://dx.doi.org/10.1109/jphot.2021.3109045.

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Cheng, Yongzhi, Rongzhou Gong i Jingcheng Zhao. "A photoexcited switchable perfect metamaterial absorber/reflector with polarization-independent and wide-angle for terahertz waves". Optical Materials 62 (grudzień 2016): 28–33. http://dx.doi.org/10.1016/j.optmat.2016.09.042.

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Mahros, Amr M., i Yara Alharbi. "Investigating the Absorption Spectra of a Plasmonic Metamaterial Absorber Based on Disc-in-Hole Nanometallic Structure". Nanomaterials 12, nr 20 (16.10.2022): 3627. http://dx.doi.org/10.3390/nano12203627.

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In this work, we present and explore the characteristics of a plasmonic metamaterial absorber based on a metal–insulator–metal functional stack. The proposed structure consists of glass “sandwiched” between a silver reflector and a titanium metallic disc, embedded inside a Ti periodic nano-hole array, as an outside layer. In the visible and infrared regimes, the optical absorption spectra of such structures have been investigated using the finite difference time domain method. The impact of modifying nano-hole and embedded disc diameters on the absorber’s performance has been investigated. Changing these two distinct structural parameters tunes the coupling effect between the localized and propagating surface plasmons. The adequate bandwidth, average spectral absorption rate, and short circuit current density are calculated to determine the performance of the designated absorber. The proposed structure of the plasmonic metamaterial absorber reaches an average absorption of over 94% in a bandwidth of 0.81 µm and near-perfect absorption of 98% around the wavelength of 0.7 µm, with an almost 100% relative absorption bandwidth and 41 mA/cm2 short circuit current density. In addition, the results show that the disc-in-hole absorber’s structural parameters can be changed precisely and facilely to tailor to the absorption spectra.

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Pi, Shuai, Tianhao Wang i Jun Lin. "Directional and High-Gain Ultra-Wideband Bow-Tie Antenna for Ground-Penetrating Radar Applications". Remote Sensing 15, nr 14 (12.07.2023): 3522. http://dx.doi.org/10.3390/rs15143522.

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Bow-tie antennas are utilized extensively in ground-penetrating radar (GPR) systems. In order to achieve sufficient penetration depth and resolution, the bow-tie antennas for GPR applications require low operating frequency, high gain, and excellent broadband. A novel ultra-wideband (UWB) bow-tie antenna with gain enhancement for GPR applications is proposed in this paper. First, a UWB bow-tie antenna with resistive loading is designed. The metal reflector and metamaterial loading make the bow-tie antenna directional, and loading the same metamaterial on the front side of the antenna further improves directional gain. After testing, the lowest frequency of the fabricated antenna is 317 MHz, the relative bandwidth is 98.6%, the peak gain in the frequency range is 9.3 dBi, and the size is only 0.38 λ at the lowest frequency. The proposed compact antenna takes both gain and bandwidth into consideration. Finally, in order to further verify the effectiveness of the proposed antenna in the GPR system, a stepped frequency continuous wave ground-penetrating radar (SFCW-GPR) system was built. The experimental results show that the designed antenna is suitable for the GPR system of deep penetration and high-resolution detection, which is beneficial to the imaging of underground structures.

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Sun, Tianqi, Fangfang Yin, Chengxiang Xu, Shan Zhao, Hua Yan i Hongcheng Yi. "Ultrawideband Precision RCS Regulation for Trihedral Corner Reflectors by Loading Resistive Film Absorbers". Electronics 11, nr 22 (11.11.2022): 3696. http://dx.doi.org/10.3390/electronics11223696.

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In this paper, an absorber with a resistive film is proposed, which holds stable polarization absorption characteristics at large angles by exploring the principle of absorption structure. The absorber contains three layers: the top layer is a metal patch with a resistive film, and the middle layer is covered with a metal patch. The thickness of the absorber structure is only 0.5 mm, and the absorber can be perfectly attached to the trihedral corner reflector (TCR) without affecting the characteristics of the reflector. By laying the absorber on the TCR, the TCR is stabilized at 8–40 GHz in the range of the incident angle ±20°, and the radar cross-section (RCS) reduction value of the TCR fluctuates around 1 dBsm. Thus, the RCS values of the three frequency points of 10 GHz, 15 GHz, and 35 GHz are consistent to achieve the accurate regulation of RCS. The stability of the absorber at different frequencies can be achieved, which is essential for the precise RCS regulation of complex scatterer structures. The effectiveness of the method was verified in experiments using a TCR metamaterial absorbing unit with resistive film.

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Hasan, Md Mhedi, Mohammad Tariqul Islam, Md Moniruzzaman, Mohamed S. Soliman, Ahmed S. Alshammari, Iman I. M. Abu Sulayman, Md Samsuzzaman i Md Shabiul Islam. "Symmetric Engineered High Polarization-Insensitive Double Negative Metamaterial Reflector for Gain and Directivity Enhancement of Sub-6 GHz 5G Antenna". Materials 15, nr 16 (18.08.2022): 5676. http://dx.doi.org/10.3390/ma15165676.

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A symmetric engineered high polarization-insensitive double negative (DNG) metamaterial (MM) reflector with frequency tunable features for fifth-generation (5G) antenna gain and directivity enhancement is proposed in this paper. Four identical unique quartiles connected by a metal strip are introduced in this symmetric resonator that substantially tunes the resonance frequency. The proposed design is distinguished by its unique symmetric architecture, high polarization insensitivity, DNG, and frequency tunable features while retaining a high effective medium ratio (EMR). Moreover, the suggested patch offers excellent reflectance in the antenna system for enhancing the antenna gain and directivity. The MM is designed on a Rogers RO3010 low loss substrate, covering the 5G sub-6GHz band with near-zero permeability and refractive index. The performance of the proposed MM is investigated using Computer Simulation Technology (CST), Advanced Design Software (ADS), and measurements. Furthermore, polarization insensitivity is investigated up to 180° angles of incidence, confirming the identical response. The 4 × 4 array of the MM has been utilized on the backside of the 5G antenna as a reflector, generating additional resonances that enhance the antenna gain and directivity by 1.5 and 1.84 dBi, respectively. Thus, the proposed prototype outperforms recent relevant studies, demonstrating its suitability for enhancing antenna gain and directivity in the 5G network.

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