Pub Date : 2012-10-01DOI: 10.1109/META.2012.6464924
Wang Ming-liang, Zhang Sheng-jun, Liu Jia-qi, Liang Wei, Liu Xue-mei, X. W. Liang
The frequency selective surface (FSS) is designed to improve the wide-band stealth performance of radar absorbing materials (RAM) at the frequency range from 2GHz to 12GHz. The FSS element structure is designed for thin RAM coating, and the electromagnetic wave reflectivity performance of RAM containing FSS is analyzed by using the numerical simulation. The influence of FSS design parameters on the reflectivity of RAM is researched, and the FSS design parameters include the element geometry parameter, the length of the array periods, and the permittivity of substrate material. The research results show that the three absorbing wide-bands can appear and that the reflectivity is lower than -10dB, so the wide-band stealth performance of RAM containing FSS can be improved at the frequency range from 2GHz to 12GHz.
{"title":"FSS design research for improving the wide-band stealth performance of radar absorbing materials","authors":"Wang Ming-liang, Zhang Sheng-jun, Liu Jia-qi, Liang Wei, Liu Xue-mei, X. W. Liang","doi":"10.1109/META.2012.6464924","DOIUrl":"https://doi.org/10.1109/META.2012.6464924","url":null,"abstract":"The frequency selective surface (FSS) is designed to improve the wide-band stealth performance of radar absorbing materials (RAM) at the frequency range from 2GHz to 12GHz. The FSS element structure is designed for thin RAM coating, and the electromagnetic wave reflectivity performance of RAM containing FSS is analyzed by using the numerical simulation. The influence of FSS design parameters on the reflectivity of RAM is researched, and the FSS design parameters include the element geometry parameter, the length of the array periods, and the permittivity of substrate material. The research results show that the three absorbing wide-bands can appear and that the reflectivity is lower than -10dB, so the wide-band stealth performance of RAM containing FSS can be improved at the frequency range from 2GHz to 12GHz.","PeriodicalId":315697,"journal":{"name":"2012 International Workshop on Metamaterials (Meta)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114587718","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-10-01DOI: 10.1109/META.2012.6464956
W. Sun, H. Yao, X. Ma, X. X. Li
Dynamic echo is the basis to analyze and discriminate the features of precession targets, but it is difficult to acquire the outfield data with small cost. In this paper, precession model of a general target is built, and the attitude formulas of elevation and azimuth are derived respectively. On the basis of the static electromagnetic scattering data, a scheme is proposed to simulate the dynamic echo of an arbitrary precession target by using the quasi-static method. Its validity is verified by the experiment results, and the RCS sequences and micro-Doppler signatures of two representative targets are analyzed based on the simulated echo.
{"title":"Dynamic echo simulation of precession target based on electromagnetic scattering model","authors":"W. Sun, H. Yao, X. Ma, X. X. Li","doi":"10.1109/META.2012.6464956","DOIUrl":"https://doi.org/10.1109/META.2012.6464956","url":null,"abstract":"Dynamic echo is the basis to analyze and discriminate the features of precession targets, but it is difficult to acquire the outfield data with small cost. In this paper, precession model of a general target is built, and the attitude formulas of elevation and azimuth are derived respectively. On the basis of the static electromagnetic scattering data, a scheme is proposed to simulate the dynamic echo of an arbitrary precession target by using the quasi-static method. Its validity is verified by the experiment results, and the RCS sequences and micro-Doppler signatures of two representative targets are analyzed based on the simulated echo.","PeriodicalId":315697,"journal":{"name":"2012 International Workshop on Metamaterials (Meta)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121626801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-10-01DOI: 10.1109/META.2012.6464933
Chaiyong Soemphol, N. Wongkasem
Near-zero refractive index metamaterials composed of epsilon near zero and mu near zero media constructed by cross and square loop structure, respectively, are proposed. The simulation results have shown that the designed metamaterials can generate a low loss transmission with a refractive index near zero at the operating frequency.
{"title":"Design of near-zero refractive index metamaterials using ε and μ near-zero media","authors":"Chaiyong Soemphol, N. Wongkasem","doi":"10.1109/META.2012.6464933","DOIUrl":"https://doi.org/10.1109/META.2012.6464933","url":null,"abstract":"Near-zero refractive index metamaterials composed of epsilon near zero and mu near zero media constructed by cross and square loop structure, respectively, are proposed. The simulation results have shown that the designed metamaterials can generate a low loss transmission with a refractive index near zero at the operating frequency.","PeriodicalId":315697,"journal":{"name":"2012 International Workshop on Metamaterials (Meta)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131321636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-10-01DOI: 10.1109/META.2012.6464940
H. Seifoory, R. Kheradmand
In this paper we present multi-functional fishnet metamaterial structures whose dimensions has been engineered and optimized to provide negative permeability, permittivity and consequently negative index of refraction at optical communication wavelength. They are based on silver as metallic layer rather than gold and SiO2 as dielectric layer which are perforated and deposited on glass substrate. Parameter retrieval procedure is done to determine the optical properties of fishnet metamaterial from calculated data using Rigorous Coupled Wave Analysis (RCWA) method.
{"title":"Design and simulation of multi-functional layer double negative fishnet metamaterial at optical communication wavelength","authors":"H. Seifoory, R. Kheradmand","doi":"10.1109/META.2012.6464940","DOIUrl":"https://doi.org/10.1109/META.2012.6464940","url":null,"abstract":"In this paper we present multi-functional fishnet metamaterial structures whose dimensions has been engineered and optimized to provide negative permeability, permittivity and consequently negative index of refraction at optical communication wavelength. They are based on silver as metallic layer rather than gold and SiO2 as dielectric layer which are perforated and deposited on glass substrate. Parameter retrieval procedure is done to determine the optical properties of fishnet metamaterial from calculated data using Rigorous Coupled Wave Analysis (RCWA) method.","PeriodicalId":315697,"journal":{"name":"2012 International Workshop on Metamaterials (Meta)","volume":"217 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120838951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-10-01DOI: 10.1109/META.2012.6464946
Zhengyong Song, R. Malureanu, M. Zalkovskij, C. Gritti, A. Andryieuski, Qiong He, P. Jepsen, A. Lavrinenko, Lei Zhou
We proposed a simple scheme to make a continuous metallic film on a semi-infinite substrate optically transparent, thus obtaining a completely transparent electrode in a desired frequency range. By placing a sub-wavelength composite layer consisting of dielectric and metallic stripes on top of the metallic one, we found that the back-scattering from the metallic film can be almost perfectly canceled by the composite layer under certain conditions, leading to transparency of the whole structure. Since our mechanism does not require any openings on the opaque metallic plate, the proposed structure retains the full electric and mechanical properties of a natural metal. The present mechanism is insensitive to structural disorders and broad variation of incidence angles. Meanwhile, we performed proof-of-concept experiments in the terahertz domain to verify our theoretical predictions, using carefully designed metamaterials to mimic plasmonic metals in optical regime. Experiments are in excellent agreements with full-wave simulations.
{"title":"A new mechanism to design transparent electrodes: THz realizations","authors":"Zhengyong Song, R. Malureanu, M. Zalkovskij, C. Gritti, A. Andryieuski, Qiong He, P. Jepsen, A. Lavrinenko, Lei Zhou","doi":"10.1109/META.2012.6464946","DOIUrl":"https://doi.org/10.1109/META.2012.6464946","url":null,"abstract":"We proposed a simple scheme to make a continuous metallic film on a semi-infinite substrate optically transparent, thus obtaining a completely transparent electrode in a desired frequency range. By placing a sub-wavelength composite layer consisting of dielectric and metallic stripes on top of the metallic one, we found that the back-scattering from the metallic film can be almost perfectly canceled by the composite layer under certain conditions, leading to transparency of the whole structure. Since our mechanism does not require any openings on the opaque metallic plate, the proposed structure retains the full electric and mechanical properties of a natural metal. The present mechanism is insensitive to structural disorders and broad variation of incidence angles. Meanwhile, we performed proof-of-concept experiments in the terahertz domain to verify our theoretical predictions, using carefully designed metamaterials to mimic plasmonic metals in optical regime. Experiments are in excellent agreements with full-wave simulations.","PeriodicalId":315697,"journal":{"name":"2012 International Workshop on Metamaterials (Meta)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114056185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-10-01DOI: 10.1109/META.2012.6464959
Su Xu, Runren Zhang, Hongsheng Chen
Invisibility cloaks have attracted wide interest recently because of their possible realization. As is one of types of invisibility cloaks, carpet cloaks were first presented by Pendry in 2008. However, most of the realized carpet cloaks in microwave region can only conceal the metal bump under TM-polarized incident wave because non-magnetism is required in the realization of the carpet cloak. Here, we demonstrate a Te-polarized microwave broadband carpet cloak based on the Tranformation Optics. Closed-rings, which are used to construct cloaking layer, can provide anisotropic permeability with little dispersion in a large frequency range required in our design. The cloaking behavior is confirmed in our measurements from 2-7 GHz.
{"title":"Te-polarized microwave broadband carpet cloak","authors":"Su Xu, Runren Zhang, Hongsheng Chen","doi":"10.1109/META.2012.6464959","DOIUrl":"https://doi.org/10.1109/META.2012.6464959","url":null,"abstract":"Invisibility cloaks have attracted wide interest recently because of their possible realization. As is one of types of invisibility cloaks, carpet cloaks were first presented by Pendry in 2008. However, most of the realized carpet cloaks in microwave region can only conceal the metal bump under TM-polarized incident wave because non-magnetism is required in the realization of the carpet cloak. Here, we demonstrate a Te-polarized microwave broadband carpet cloak based on the Tranformation Optics. Closed-rings, which are used to construct cloaking layer, can provide anisotropic permeability with little dispersion in a large frequency range required in our design. The cloaking behavior is confirmed in our measurements from 2-7 GHz.","PeriodicalId":315697,"journal":{"name":"2012 International Workshop on Metamaterials (Meta)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128765814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-10-01DOI: 10.1109/META.2012.6464918
Tun Cao, M. Cryan
We calculate the optical force exerted on the nanoparticle close proximity to the surface of fishnet metamaterials penetrating through metal/dielectric/metal films when irradiated at near infrared wavelength. These forces show the resonant frequencies similar to the magnetic resonant frequencies in the double negative index fishnet metamaterial. We also present that the optical force can be enhanced by optimizing the geometry of the fishnet to provide a stronger magnetic resonant dipole. In contrast to the other plasmonic nanostructure always obtaining trapping force using electrical resonant dipole, our presented structure utilizes the magnetic resonance to provide a gradient force, which is suitable for the optical trapping of the nanoscale particles at illumination intensities of just 1mW/μm2, the optical force is sufficient to overcome the Earth's gravitational pull.
{"title":"Optical trapping using double negative index fishnet metamaterial","authors":"Tun Cao, M. Cryan","doi":"10.1109/META.2012.6464918","DOIUrl":"https://doi.org/10.1109/META.2012.6464918","url":null,"abstract":"We calculate the optical force exerted on the nanoparticle close proximity to the surface of fishnet metamaterials penetrating through metal/dielectric/metal films when irradiated at near infrared wavelength. These forces show the resonant frequencies similar to the magnetic resonant frequencies in the double negative index fishnet metamaterial. We also present that the optical force can be enhanced by optimizing the geometry of the fishnet to provide a stronger magnetic resonant dipole. In contrast to the other plasmonic nanostructure always obtaining trapping force using electrical resonant dipole, our presented structure utilizes the magnetic resonance to provide a gradient force, which is suitable for the optical trapping of the nanoscale particles at illumination intensities of just 1mW/μm2, the optical force is sufficient to overcome the Earth's gravitational pull.","PeriodicalId":315697,"journal":{"name":"2012 International Workshop on Metamaterials (Meta)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128068351","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-10-01DOI: 10.1109/META.2012.6464948
Kun Ding, Yuan Shen, J. Ng, Lei Zhou
Based on light-scattering properties of graphene which possesses linear electronic band structure, we formulated a theoretical approach to study the optical properties of metamaterials made by patterning a graphene. The theory was applied to study various graphene-based MTMs, with predictions (with no adjustable parameters) for a particular system in excellent agreement with previous experiments.
{"title":"A theoretical study on graphene-based metamaterials","authors":"Kun Ding, Yuan Shen, J. Ng, Lei Zhou","doi":"10.1109/META.2012.6464948","DOIUrl":"https://doi.org/10.1109/META.2012.6464948","url":null,"abstract":"Based on light-scattering properties of graphene which possesses linear electronic band structure, we formulated a theoretical approach to study the optical properties of metamaterials made by patterning a graphene. The theory was applied to study various graphene-based MTMs, with predictions (with no adjustable parameters) for a particular system in excellent agreement with previous experiments.","PeriodicalId":315697,"journal":{"name":"2012 International Workshop on Metamaterials (Meta)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126165371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-10-01DOI: 10.1109/META.2012.6464957
H. Yao, X. Y. Zhou, W. Sun, X. Ma
ISAR simulation of complex targets based on electromagnetic scattering field is significant to targets' stealth design, ISAR image interpretation and radar target recognition. In this paper, the high frequency approximation methods are applied to calculate the scattering field of complex targets, the theory of ISAR imaging based on electromagnetic scattering field is researched, and the principles for simulating parameters setting and imaging algorithms choosing are given. Based on these, the whole flowchart is proposed to simulate ISAR image based on electromagnetic scattering field, the validity of which is verified by the ISAR imaging experiments of complex targets.
{"title":"ISAR imaging of complex targets based on electromagnetic scattering field","authors":"H. Yao, X. Y. Zhou, W. Sun, X. Ma","doi":"10.1109/META.2012.6464957","DOIUrl":"https://doi.org/10.1109/META.2012.6464957","url":null,"abstract":"ISAR simulation of complex targets based on electromagnetic scattering field is significant to targets' stealth design, ISAR image interpretation and radar target recognition. In this paper, the high frequency approximation methods are applied to calculate the scattering field of complex targets, the theory of ISAR imaging based on electromagnetic scattering field is researched, and the principles for simulating parameters setting and imaging algorithms choosing are given. Based on these, the whole flowchart is proposed to simulate ISAR image based on electromagnetic scattering field, the validity of which is verified by the ISAR imaging experiments of complex targets.","PeriodicalId":315697,"journal":{"name":"2012 International Workshop on Metamaterials (Meta)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126970816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-10-01DOI: 10.1109/META.2012.6464954
K. Han, C. C. Chen, D. D. Shen, Feng. Pan, Q. Q Fang, C. X Weng, X. Y. Zhou
We present a new method to reconstruct high resolution SAR images. When the far-field data arranged in the polar format, a 2-D Fourier transform can achieve the image reconstruction. But the data do not fall on a Cartesian grid, we introduce 2-D Nonuniform Fast Fourier Transform (NUFFT) to reconstruct the SAR image directly. It is the first time to use NUFFT technology in SAR image reconstruction. Instead of interpolating the input data, NUFFT interpolate the exponential function for each sampling point. The technology could easily extended to high dimensional by tensor product. The 2-D NUFFT is very suitable to reconstruct SAR image. A ground target example will shown to demonstrate that the reconstructed images have higher resolution than the general method when using the same data.
{"title":"An accurate 2-D nonuniform fast fourier transform method applied to high resolution SAR image reconstruction","authors":"K. Han, C. C. Chen, D. D. Shen, Feng. Pan, Q. Q Fang, C. X Weng, X. Y. Zhou","doi":"10.1109/META.2012.6464954","DOIUrl":"https://doi.org/10.1109/META.2012.6464954","url":null,"abstract":"We present a new method to reconstruct high resolution SAR images. When the far-field data arranged in the polar format, a 2-D Fourier transform can achieve the image reconstruction. But the data do not fall on a Cartesian grid, we introduce 2-D Nonuniform Fast Fourier Transform (NUFFT) to reconstruct the SAR image directly. It is the first time to use NUFFT technology in SAR image reconstruction. Instead of interpolating the input data, NUFFT interpolate the exponential function for each sampling point. The technology could easily extended to high dimensional by tensor product. The 2-D NUFFT is very suitable to reconstruct SAR image. A ground target example will shown to demonstrate that the reconstructed images have higher resolution than the general method when using the same data.","PeriodicalId":315697,"journal":{"name":"2012 International Workshop on Metamaterials (Meta)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130206238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：