Pub Date : 2018-07-01DOI: 10.1109/mmet.2018.8460303
E. Gevorkyan
The article is devoted to the study of the transition radiation of the source (charged particle), which moves perpendicular to the axis of the waveguide with modulated anisotropic filling. The special attention is given to characteristics of this radiation in the region of “strong” interaction. The transition radiation energy for the TE field in the waveguide is calculated in the above-mentioned region in view of small modulation depths. It is shown that under certain conditions Cerenkov radiation can arise in the region of strong interaction.
{"title":"Transition Radiation in a Waveguide Filled with Periodically Modulated Medium","authors":"E. Gevorkyan","doi":"10.1109/mmet.2018.8460303","DOIUrl":"https://doi.org/10.1109/mmet.2018.8460303","url":null,"abstract":"The article is devoted to the study of the transition radiation of the source (charged particle), which moves perpendicular to the axis of the waveguide with modulated anisotropic filling. The special attention is given to characteristics of this radiation in the region of “strong” interaction. The transition radiation energy for the TE field in the waveguide is calculated in the above-mentioned region in view of small modulation depths. It is shown that under certain conditions Cerenkov radiation can arise in the region of strong interaction.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"46 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114036777","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460458
N. Tsitsas
Plane-wave scattering by a planar all-dielectric metasurface is considered. The associated boundary-value problem is reformulated in an integral form involving the layered medium's Green's function. Then, a rigorous entire-domain integral-equation methodology is developed for the accurate determination of the reflected and transmitted fields. Certain numerical results are reported, exhibiting specific metasurfaces, which can operate efficiently as narrow-band reflection filters. Connections to applications of controlling the propagation direction of electromagnetic waves are pointed out.
{"title":"An Entire- Domain Galerkin Method for the Analysis of Wave Scattering by All-Dielectric Metasurfaces","authors":"N. Tsitsas","doi":"10.1109/MMET.2018.8460458","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460458","url":null,"abstract":"Plane-wave scattering by a planar all-dielectric metasurface is considered. The associated boundary-value problem is reformulated in an integral form involving the layered medium's Green's function. Then, a rigorous entire-domain integral-equation methodology is developed for the accurate determination of the reflected and transmitted fields. Certain numerical results are reported, exhibiting specific metasurfaces, which can operate efficiently as narrow-band reflection filters. Connections to applications of controlling the propagation direction of electromagnetic waves are pointed out.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116362370","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460309
T. Oğuzer, A. Altintas
Two-dimensional (2-D) scattering of the H-polarized plane wave by a composite flat material strip is investigated. It is made as graphene-dielectric-graphene sandwich-like structure which is placed in the free space. Our modeling uses singular integral equations and Nystrom discretization. The total scattering cross-section and the absorption cross-section are computed, together with the relative error plots for the current and the far field. The surface plasmon resonances on the graphene strips and the thin dielectric layer performance are evaluated.
{"title":"Electromagnetic Scattering of THz Waves from a Microsize Graphene-Sandwiched Thin Dielectric Strip","authors":"T. Oğuzer, A. Altintas","doi":"10.1109/MMET.2018.8460309","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460309","url":null,"abstract":"Two-dimensional (2-D) scattering of the H-polarized plane wave by a composite flat material strip is investigated. It is made as graphene-dielectric-graphene sandwich-like structure which is placed in the free space. Our modeling uses singular integral equations and Nystrom discretization. The total scattering cross-section and the absorption cross-section are computed, together with the relative error plots for the current and the far field. The surface plasmon resonances on the graphene strips and the thin dielectric layer performance are evaluated.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127501504","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460314
Y. Trotsenkc, V. Brzhezitsky, O. Protsenko, Y. Haran, V. Chumack
The mathematical determination of the output voltage of the voltage divider using the Duhamel's integral was performed for the case when the waveform of the input voltage and the step response of the divider are known. Approximate formula for determining the waveform of output voltage using the Duhamel's integral is presented. The conversion of the graphic image of the step response into an array of data is described. The results obtained make it possible to estimate for the first time the accuracy of the voltage divider at the scale transformation of voltage pulses with different front durations.
{"title":"Calculation of High Voltage Divider Accuracy Using Duhamel's Integral","authors":"Y. Trotsenkc, V. Brzhezitsky, O. Protsenko, Y. Haran, V. Chumack","doi":"10.1109/MMET.2018.8460314","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460314","url":null,"abstract":"The mathematical determination of the output voltage of the voltage divider using the Duhamel's integral was performed for the case when the waveform of the input voltage and the step response of the divider are known. Approximate formula for determining the waveform of output voltage using the Duhamel's integral is presented. The conversion of the graphic image of the step response into an array of data is described. The results obtained make it possible to estimate for the first time the accuracy of the voltage divider at the scale transformation of voltage pulses with different front durations.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116889044","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 : 2018-07-01DOI: 10.1109/mmet.2018.8460245
Y. Kovshov, S. Ponomarenko, S. Kishko, A. Likhachev, A. Danik, V. Zheltov, E. Khutoryan, Dmytro Zahrevskyi, A. Kuleshov
We analyzed the effect of velocity spread of electron beam in a clinotron. It was shown that depending on beam current, clinotron angle, etc., the velocity spread strongly affect on the output power and may result in power decrease when the lower electron layers move slower than upper ones and in power increase in the opposite case. The multi-frequency oscillations caused by electron velocity spread were studied.
{"title":"Electron Beam Velocity Spread Effect on a Clinotron Operation","authors":"Y. Kovshov, S. Ponomarenko, S. Kishko, A. Likhachev, A. Danik, V. Zheltov, E. Khutoryan, Dmytro Zahrevskyi, A. Kuleshov","doi":"10.1109/mmet.2018.8460245","DOIUrl":"https://doi.org/10.1109/mmet.2018.8460245","url":null,"abstract":"We analyzed the effect of velocity spread of electron beam in a clinotron. It was shown that depending on beam current, clinotron angle, etc., the velocity spread strongly affect on the output power and may result in power decrease when the lower electron layers move slower than upper ones and in power increase in the opposite case. The multi-frequency oscillations caused by electron velocity spread were studied.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125525223","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 : 2018-07-01DOI: 10.1109/mmet.2018.8460463
D. Karlov, A. Y. Yatsusenko, M. Pichugin, A. Karlov, I. M. Pichugin, I. Vasil’eva
The paper considers the questions of developing an aerospace defense informational system. The system essential functions are defined. The algorithm for the method of multichannel energy detection is suggested. The results of modeling the dependence of conditional probability of determined radio-signal of prescribed duration and Gaussian noise total energy correct detection against signal-and-noise energies ratio, the dependence of decision threshold on signal duration and qualitative measures for the method of full target velocity vector derivation are presented. The received results could be used at developing advanced aerospace defense systems.
{"title":"Principles of Creation of an Aerospace Defense Informational System","authors":"D. Karlov, A. Y. Yatsusenko, M. Pichugin, A. Karlov, I. M. Pichugin, I. Vasil’eva","doi":"10.1109/mmet.2018.8460463","DOIUrl":"https://doi.org/10.1109/mmet.2018.8460463","url":null,"abstract":"The paper considers the questions of developing an aerospace defense informational system. The system essential functions are defined. The algorithm for the method of multichannel energy detection is suggested. The results of modeling the dependence of conditional probability of determined radio-signal of prescribed duration and Gaussian noise total energy correct detection against signal-and-noise energies ratio, the dependence of decision threshold on signal duration and qualitative measures for the method of full target velocity vector derivation are presented. The received results could be used at developing advanced aerospace defense systems.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124529122","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460438
M. Dzyubenko, V. Radionov, V. Maslov, E. Odarenko
The results of the investigation of gradient fragmented gratings in the terahertz range are presented. Numerical calculations of the electric field phase are carried out for waves reflected and transmitted by gradient grating. Field phase profiles are obtained for plane polarization cases with different directions of the electric field vector. Rotation of the polarization plane results in distortion of the phase fronts of the reflected and transmitted waves. The effect of the substrate on which the grating is located on the spatial distribution of the field phase is shown. The curvature of the phase front is similar to the schematic with a concave mirrors for reflected waves and a focusing lens for transmitted waves. Therefore a flat gradient structure acquires the functions of a concave or convex mirror and simultaneously a focusing or scattering lens. Such gradient gratings can be used in various devices, and in particular in resonators of terahertz lasers.
{"title":"Simplified Modeling of Gradient Fragmented Metal Gratings of the Terahertz Range","authors":"M. Dzyubenko, V. Radionov, V. Maslov, E. Odarenko","doi":"10.1109/MMET.2018.8460438","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460438","url":null,"abstract":"The results of the investigation of gradient fragmented gratings in the terahertz range are presented. Numerical calculations of the electric field phase are carried out for waves reflected and transmitted by gradient grating. Field phase profiles are obtained for plane polarization cases with different directions of the electric field vector. Rotation of the polarization plane results in distortion of the phase fronts of the reflected and transmitted waves. The effect of the substrate on which the grating is located on the spatial distribution of the field phase is shown. The curvature of the phase front is similar to the schematic with a concave mirrors for reflected waves and a focusing lens for transmitted waves. Therefore a flat gradient structure acquires the functions of a concave or convex mirror and simultaneously a focusing or scattering lens. Such gradient gratings can be used in various devices, and in particular in resonators of terahertz lasers.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132900543","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460261
Y. Grynko, J. Förstner
We describe an implementation of the Discontinuous Galerkin Time Domain (DGTD) method for massively parallel numerical simulations of the nonlinear optical response from metallic nanostructures. A Maxwell- Vlasov hydrodynamic model is used to account for the nonlinear effects in the motion of the free electrons in a metal. The model is applied to simulate the second-harmonic generation (SHG) from the golden gap nanoantennas with random surface rougness. The results show that surface defects break the symmetry of the structure and produce bright SHG hot spots on the surface of nanoantennas. This increases the far-field SHG intensity by orders of magnitude.
{"title":"Application of the Discontinuous Galerkin Time Domain Method in Nonlinear Nanoplasmonics","authors":"Y. Grynko, J. Förstner","doi":"10.1109/MMET.2018.8460261","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460261","url":null,"abstract":"We describe an implementation of the Discontinuous Galerkin Time Domain (DGTD) method for massively parallel numerical simulations of the nonlinear optical response from metallic nanostructures. A Maxwell- Vlasov hydrodynamic model is used to account for the nonlinear effects in the motion of the free electrons in a metal. The model is applied to simulate the second-harmonic generation (SHG) from the golden gap nanoantennas with random surface rougness. The results show that surface defects break the symmetry of the structure and produce bright SHG hot spots on the surface of nanoantennas. This increases the far-field SHG intensity by orders of magnitude.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133050241","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460350
L. Khashan
TLM method is a reliable numerical technique in modeling Electromagnetic problems. This method requires meshing the problem space. Using Delaunay triangulation (unstructured meshes) allows minimizing error that result from curved details. A computer algorithm is created by implementing TLM on unstructured meshes. Accuracy and run time are recorded for circular resonators meshed in different types and number of meshes.
{"title":"Implementation of Transmssion Line modeling (TLM) Method on Two-dimensional Unstructrued meshes","authors":"L. Khashan","doi":"10.1109/MMET.2018.8460350","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460350","url":null,"abstract":"TLM method is a reliable numerical technique in modeling Electromagnetic problems. This method requires meshing the problem space. Using Delaunay triangulation (unstructured meshes) allows minimizing error that result from curved details. A computer algorithm is created by implementing TLM on unstructured meshes. Accuracy and run time are recorded for circular resonators meshed in different types and number of meshes.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133153384","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 : 2018-07-01DOI: 10.1109/MMET.2018.8460404
H. D. Basdemir
In this review, modified theory of physical optics approach to the diffraction problem is revisited. The important aspects of the method are explained and steps for the usage of the method are revealed. Also, historical progress of the method is mentioned.
{"title":"Review on the Modified Theory of Physical Optics","authors":"H. D. Basdemir","doi":"10.1109/MMET.2018.8460404","DOIUrl":"https://doi.org/10.1109/MMET.2018.8460404","url":null,"abstract":"In this review, modified theory of physical optics approach to the diffraction problem is revisited. The important aspects of the method are explained and steps for the usage of the method are revealed. Also, historical progress of the method is mentioned.","PeriodicalId":343933,"journal":{"name":"2018 IEEE 17th International Conference on Mathematical Methods in Electromagnetic Theory (MMET)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132119598","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}
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