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Добірка наукової літератури з теми "Thin Films for Radar Absorbing Structures"

Автор: Grafiati

Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Thin Films for Radar Absorbing Structures"

Wei, Hu, Li Cheng, and Dmitry Shchukin. "Effect of Porous Structure on the Microwave Absorption Capacity of Soft Magnetic Connecting Network Ni/Al2O3/Ni Film." Materials 13, no. 7 (April 9, 2020): 1764. http://dx.doi.org/10.3390/ma13071764.

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Microwave radar absorbing materials have been the focus of the radar stealth research field. In this study, ceramic structured porous honeycomb-like Al2O3 film was prepared by anodic oxidation, and an Ni layer was deposited on the Al2O3 film via electrodeposition in a neutral environment to form a flower- and grain-like structure in a three-dimensional (3D) network Ni/Al2O3/Ni film. The films both have a through-hole internal structure, soft magnetic properties, and absorb microwaves. The dielectric loss values of two films were little changed, and the maximum microwave absorption values of flower- and grain-like Ni/Al2O3/Ni film were −45.3 and −31.05 dB with relatively wide effective bandwidths, respectively. The porous ceramic structure Al2O3 interlayer prevented the reunion of Ni and isolated the eddy current to improve the microwave absorption properties. The material presented in our paper has good microwave absorption performance with a thin thickness, which indicates the potential for lightweight and efficient microwave absorption applications.

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Xu, Haibing, Shaowei Bie, Yongshun Xu, Wei Yuan, Qian Chen, and Jianjun Jiang. "Broad bandwidth of thin composite radar absorbing structures embedded with frequency selective surfaces." Composites Part A: Applied Science and Manufacturing 80 (January 2016): 111–17. http://dx.doi.org/10.1016/j.compositesa.2015.10.019.

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Kapelewski, J. "On Current and Prospective Use of Binary Thin Multilayers in Radar Absorbing Structures." Acta Physica Polonica A 124, no. 3 (September 2013): 451–55. http://dx.doi.org/10.12693/aphyspola.124.451.

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Котликов, Е. Н., та А. Н. Тропин. "Расчет напряженности электрического поля в интерференционных покрытиях". Оптика и спектроскопия 130, № 11 (2022): 1761. http://dx.doi.org/10.21883/os.2022.11.53786.3630-22.

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A technique for calculating the electric field in interference coatings is described. The technique is used to find areas in the coating structure with electric field minima. Thin absorbing metal films are introduced into these areas during design. The results of calculating the transmission spectra of narrow-band interference filters with absorbing metal films are presented. It is shown that such metal-dielectric thin-film structures block radiation in the long-wavelength region of the spectrum.

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Kotlikov E. N. and Tropin A. N. "Calculation of the electric field in interference coatings." Optics and Spectroscopy 130, no. 11 (2022): 1492. http://dx.doi.org/10.21883/eos.2022.11.55112.3630-22.

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Nair, P. K., L. Huang, M. T. S. Nair, Hailin Hu, E. A. Meyers, and R. A. Zingaro. "Formation of p-type Cu3BiS3 absorber thin films by annealing chemically deposited Bi2S3–CuS thin films." Journal of Materials Research 12, no. 3 (March 1997): 651–56. http://dx.doi.org/10.1557/jmr.1997.0099.

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Formation of the ternary compound Cu3BiS3 during annealing of chemically deposited CuS (∼0.3 μm) films on Bi2S3 film (∼0.1 μm on glass substrate) is reported. The interfacial atomic diffusion leading to the formation of the compound during the annealing is indicated in x-ray photoelectron depth profile spectra of the films. The formation of Cu3BiS3 (Wittichenite, JCPDS 9-488) is confirmed by the x-ray diffraction (XRD) patterns. The films are optically absorbing in the entire visible region (absorption coefficient 4 × 104 cm−1 at 2.48 eV or 0.50 μm) and are p-type with electrical conductivity of 102−103 Ω−1 cm−1. Potential applications of these films as optical coatings in the control of solar energy transmittance through glazings and as a p-type absorber film in solar cell structures are indicated.

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Mazinov A. S, Fitaev I. Sh, and Boldyrev N. A. "Attenuation of the normal component of the reflected electromagnetic wave by combined radio-absorbing coatings." Technical Physics Letters 48, no. 10 (2022): 24. http://dx.doi.org/10.21883/tpl.2022.10.54792.19324.

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A combined radar-absorbent coating on a solid metal surface was studied. The structure of such coatings was developed, an experimental investigation of their frequency dependences was conducted, and scattering diagrams of both the combined surface and its constituents were obtained. The research findings of attenuating abilities for the proposed multi-layer structures are demonstrated. Keywords: Diagram of scattering, reflection of electromagnetic waves, metamaterials, ultrathin conductive films, combined coatings.

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Fitaev, Ibraim Shevketovich, Vulf Borisrvich Orlenson, Yuri Viktorovich Romanets, and Alim Seit-Ametovich Mazinov. "Surface topologies of thin aluminum films and absorbing properties of metal dielectric structures in the microwave range." ITM Web of Conferences 30 (2019): 08013. http://dx.doi.org/10.1051/itmconf/20193008013.

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The paper presents experimental and theoretical results on the surface topography of thin aluminum films. The ambiguous topology dynamics of the thin-film structure is represented as a function of the increase in the bulk mass of the deposited material, which leads to an occasional rise in roughness reaching its maximum at a film thickness of 7 nm. At same time on the same thickness of the conductive layer the maximum of the absorption coefficient variability is observed. A theoretical analysis of the optical coefficients depending on the size of the conductive film substantiated the existence of extremes, but at smaller thicknesses.

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Heo, Jiwoong, Daheui Choi, and Jinkee Hong. "Layer-by-Layer Self-Assembled Ferrite Multilayer Nanofilms for Microwave Absorption." Journal of Nanomaterials 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/164619.

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We demonstrate a simple method for fabricating multilayer thin films containing ferrite (Co0.5Zn0.5Fe2O4) nanoparticles, using layer-by-layer (LbL) self-assembly. These films have microwave absorbing properties for possible radar absorbing and stealth applications. To demonstrate incorporation of inorganic ferrite nanoparticles into an electrostatic-interaction-based LbL self-assembly, we fabricated two types of films: (1) a blended three-component LbL film consisting of a sequential poly(acrylic acid)/oleic acid-ferrite blend layer and a poly(allylamine hydrochloride) layer and (2) a tetralayer LbL film consisting of sequential poly(diallyldimethylammonium chloride), poly(sodium-4-sulfonate), bPEI-ferrite, and poly(sodium-4-sulfonate) layers. We compared surface morphologies, thicknesses, and packing density of the two types of ferrite multilayer film. Ferrite nanoparticles (Co0.5Zn0.5Fe2O4) were prepared via a coprecipitation method from an aqueous precursor solution. The structure and composition of the ferrite nanoparticles were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, transmission electron microscopy, and scanning electron microscopy. X-ray diffraction patterns of ferrite nanoparticles indicated a cubic spinel structure, and energy dispersive X-ray spectroscopy revealed their composition. Thickness growth and surface morphology were measured using a profilometer, atomic force microscope, and scanning electron microscope.

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Tsai, Chia-Lung, S. N. Manjunatha, Sheng Hsiung Chang, Ming-Jer Jeng, Liann-Be Chang, Chun-Huan Chang, Mukta Sharma, and Chi-Tsu Yuan. "Properties of FAPbI3-Based Alloy Perovskite Thin Films and Their Application in Solar Cells." Processes 11, no. 5 (May 11, 2023): 1450. http://dx.doi.org/10.3390/pr11051450.

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Surface morphologies, light harvesting abilities, crystal structures, and excitonic properties of the formamiminium lead triiodide (FAPbI3) based alloy perovskite thin films were investigated by using the scanning electron microscopic images, absorbance spectra, X-ray diffraction patterns, photoluminescence (PL) spectra and time-resolved PL decaying curves. Our experimental results show that the fresh CsxFA1−xPbI3, RbxFA1−xPbI3, and FAPb(SCNxI1−x)3 alloy thin films are a pure α-phase perovskite crystal, a α-phase: δ-phase mixed perovskite crystal, and a PbI2 crystal/α-phase: δ-phase mixed perovskite crystal at room temperatures, respectively. Among the three FAPbI3 based alloy perovskite solar cells, the Cs1−xFAxPbI3 solar cells have the better photovoltaic responses. It is noted that the high photocurrent density is mainly due to the formation of cube-like surface morphology and the long carrier lifetime of 368 ns when the Cs1−xFAxPbI3 alloy perovskite thin film is used as the light-absorbing layer. Our findings provide the relation between the properties of the FAPbI3 based alloy perovskite thin films and the photovoltaic responses of the resultant solar cells.

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Більше джерел

Дисертації з теми "Thin Films for Radar Absorbing Structures"

Angappan, M. "Investigation of Thin Films for Frequency Selective Surface Based Radar Absorbing Structures." Thesis, 2021. https://etd.iisc.ac.in/handle/2005/5657.

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Modern day stealth aircraft uses microwave absorbers for absorption of incident Radar signals transmitted by rival aircraft. Recently, several attempts were made to fabricate radar absorbing structures (RAS) of various configurations and embedding frequency selective surfaces (FSS), in the form of periodic 2-D patterns, is one of the approaches. The FSS is fabricated from resistive thin films which are usually coated on a dielectric substate. The use of thin films with optimum properties is essential for achieving broadband microwave absorption. For stealth aircraft structures, there exists a need to synthesize and investigate resistive thin films having properties ranging from good optical transparency, electrical conductivity coupled with good mechanical properties and structural integrity. In this work, sputter coating of thin films of Gold, Indium Tin Oxide (ITO), Silver Nanowire were attempted on Polymethyl Methacrylate (PMMA), a difficult substrate (PMMA) to process in vacuum, and characterized for their optical & electrical properties and environmental stability. Thin film of ITO emerged as the suitable candidate and the film properties were further tailored such that it can be employed as top FSS layer and backplane of the optically transparent RAS. The RAS was designed using CST microwave studio by employing Jerusalem Cross as FSS element. The absorber configuration was optimized for wide bandwidth performance, good angular stability and polarization insensitiveness. Similarly, Nickel thin films were deposited on E-Glass fabric and electromagnetic and mechanical properties were characterized to examine their suitability for load bearing structural members. Integral RAS for both optically transparent and structural applications were fabricated for the optimized configurations. The optically transparent microwave absorber was shown to exhibit polarization independent absorptivity with a bandwidth of 8.5 GHz and good angular stability up to 45o. The absorber for structural applications was shown to possess good absorptivity with a bandwidth of 6.5 GHz in comparison to the bandwidth of 4.5 GHz exhibited by a conventional particle loaded absorber which was also fabricated in this work

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Тези доповідей конференцій з теми "Thin Films for Radar Absorbing Structures"

Liubetski, N., H. Volunets, Y. Padrez, and D. Bychanok. "Creation of Radar-Absorbing Structures Based on Carbon Films." In 2020 IEEE Ukrainian Microwave Week (UkrMW). IEEE, 2020. http://dx.doi.org/10.1109/ukrmw49653.2020.9252716.

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Rao, X. S., S. Matitsine, and H. Lim. "Ultra-thin radar absorbing structures based on short strip pairs." In Proceedings of the International Conference on Materials for Advanced Technologies (Symposium P). WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812709547_0036.

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Ouellette, Francois. "Guided modes of thin absorbing Langmuir-Blodgett films in symmetric structures." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1988. http://dx.doi.org/10.1364/oam.1988.mr5.

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The guided modes of thin absorbing Langmuir-Blodgett films of organic dyes surrounded by identical media were studied. A symmetric waveguide has no cutoff thickness and thus can be used to study very thin films of only a few monolayers. The modes can be excited by the frustrated total reflection technique using a high-index prism. The dye is modeled as having an isolated absorption band with a dielectric function represented by the Drode-Lorentz expression. The film is assumed to be uniaxial with the chromophore lying either parallel to the film or perpendicular to it. When the product of the transition moment by the relaxation time is large enough, the real part of the dielectric constant becomes negative at some wavelengths. For a parallel orientation, the film then supports two modes identified as the long-range and short-range exciton polariton modes that merge into a single surface mode for infinite film thickness. For the perpendicular orientation, a new type of exciton polariton mode appears for very thin films that is not supported as a surface mode when the thickness is infinite. Calculations show that a large enhancement of the field in the film on excitation by a prism is possible in many cases, opening up possible applications for nonlinear optics.

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Su, W.-F. A., S. J. Weinstein, H. C. Cooper, and J. K. Beuchel. "Polymeric Integrated Optical Circuits." In Organic Thin Films for Photonic Applications. Washington, D.C.: Optica Publishing Group, 1993. http://dx.doi.org/10.1364/otfa.1993.wd.12.

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Polymeric integrated multimode waveguides (100 µm × 125 µm × 3 in.) have been developed on conventional FR-4 epoxy printed circuit boards (PCBs) using UV curable polymers and negative photolithographic technology. Through molecular engineering, solventless UV curable guiding and cladding materials with appropriate optical and mechanical properties have been synthesized for waveguide applications in the visible and near-infrared wavelength regions. The solventless feature of these materials made them possible to fabricate thick waveguides in single process. Novel planarization technique have been developed to overcome the problems of surface waviness of the PCBs. Multimode (>75 microns) waveguides have been fabricated to distribute control signals to multiple transmit/receive (T/R) modules on large-array radar antennas. To date, waveguide structures with straight, curved, Y-split and tap geometries have been designed and fabricated successfully on PCBs; good light intensity outputs from Y-split and multiple-tap buses were obtained. This paper will discuss the materials and optical circuit fabrication of the waveguide structures and the results of laboratory tests using the optical buses for control signal distribution to T/R modules.

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Giovannini, H., and C. Amra. "Enhanced Absorption with Coated Rough Black Surfaces." In Optical Interference Coatings. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/oic.1998.tha.1.

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Scattering from optical thin films has been studied for many years. With optical surfaces, most of the energy is carried by specular (reflected and transmitted) beams, the amount of absorbed and scattered light being negligible. In another range of applications involving design of light traps, solar collectors, telescope vanes and detectors, industrial paints[1]… multilayered rough surfaces must be considered. In these cases specular fluxes are practically reduced to zero. The aim of this paper is to briefly describe a theoretical tool that permit one to compute scattering from this kind of structures and to show the method used to design highly absorbing components. The results obtained experimentally show that it is possible to strongly increase the performances of standard quality light absorbers, by coating the bare rough black surfaces with a well-designed layer.

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