Pub Date : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8509995
L. Alyabyeva, S. Yegiyan, V. Torgashev, E. Zhukova, D. Vinnik, A. Prokhorov, S. Gudkova, B. Gorshunov
Electrodynamic response of single-crystalline M-type barium hexaferrite doped with $mathbf{Ti}^{4+}$ is studied for two principal polarizations in the temperature range 10–300 K by means of terahertz-infrared spectroscopy. The dynamics of polar phonons is investigated along with low-energy absorption mechanisms connected with relaxation process in polar domain walls and with anharmonic contributions of multiple phonons interaction.
{"title":"Polar soft mode in titanium-doped single crystalline BaFe12-xTix019 M-type hexaferrite","authors":"L. Alyabyeva, S. Yegiyan, V. Torgashev, E. Zhukova, D. Vinnik, A. Prokhorov, S. Gudkova, B. Gorshunov","doi":"10.1109/IRMMW-THZ.2018.8509995","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8509995","url":null,"abstract":"Electrodynamic response of single-crystalline M-type barium hexaferrite doped with $mathbf{Ti}^{4+}$ is studied for two principal polarizations in the temperature range 10–300 K by means of terahertz-infrared spectroscopy. The dynamics of polar phonons is investigated along with low-energy absorption mechanisms connected with relaxation process in polar domain walls and with anharmonic contributions of multiple phonons interaction.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"12 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74518127","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8509935
A. Maestrini, L. Gatilova, J. Treuttel, Y. Jin, A. Cavanna, D. Melgar, T. Vacelet, A. Feret, S. Caroopen, G. Gay, F. Dauplay, J. Krieg, B. Thomas, P. D. de Maagt, C. Goldstein
A 1080-127SGHz prototype receiver for the Submillimeter Wave Instrument of JUICE with state-of-the-art performance is presented. The receiver is based on European Schottky diode technologies.
{"title":"The 1200GHz Receiver Frontend of the Submillimetre Wave Instrument of ESA JUpiter ICy moons Explorer","authors":"A. Maestrini, L. Gatilova, J. Treuttel, Y. Jin, A. Cavanna, D. Melgar, T. Vacelet, A. Feret, S. Caroopen, G. Gay, F. Dauplay, J. Krieg, B. Thomas, P. D. de Maagt, C. Goldstein","doi":"10.1109/IRMMW-THZ.2018.8509935","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8509935","url":null,"abstract":"A 1080-127SGHz prototype receiver for the Submillimeter Wave Instrument of JUICE with state-of-the-art performance is presented. The receiver is based on European Schottky diode technologies.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"181 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74382289","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510369
N. V. van Hoof, Stan E. T. ter Huurne, J. Rivas, A. Halpin
We demonstrate a novel technique that enables the sub-diffraction near-field study of photo-excited structures probed with broadband THz radiation. As a proof-of-concept this system measures sub-ps temporal dynamics of photoexcited carriers in a thin film of GaAs with a spatial resolution of 60 μm (λ/10 at 0.5 THz peak intensity).
{"title":"THz Transient Photoconductivity with Near-Field Detection","authors":"N. V. van Hoof, Stan E. T. ter Huurne, J. Rivas, A. Halpin","doi":"10.1109/IRMMW-THZ.2018.8510369","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510369","url":null,"abstract":"We demonstrate a novel technique that enables the sub-diffraction near-field study of photo-excited structures probed with broadband THz radiation. As a proof-of-concept this system measures sub-ps temporal dynamics of photoexcited carriers in a thin film of GaAs with a spatial resolution of 60 μm (λ/10 at 0.5 THz peak intensity).","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"20 3","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72590792","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510269
W. Tan, Caihong Zhang, Hua Li, Dacheng Wang, Zheng Feng, B. Jin
We demonstrate a bi-layer metamaterial structure with mirror symmetry that acts as a linear polarization converter under two-antisymmetric-beam illumination. Its high performance, including broad bandwidth, high transmittance and high efficiency, originates from the combination of two interference processes: the Fabry-Pérot-like cavity effect between two metallic patterned layers and coherent excitations of spatially separated subwavelength resonators. Terahertz (THz) experiments show good agreement with numerical simulations.
{"title":"Bi-layer Metamaterial based Broadband Linear Polarization Converter under Two Coherent Beam Illumination","authors":"W. Tan, Caihong Zhang, Hua Li, Dacheng Wang, Zheng Feng, B. Jin","doi":"10.1109/IRMMW-THZ.2018.8510269","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510269","url":null,"abstract":"We demonstrate a bi-layer metamaterial structure with mirror symmetry that acts as a linear polarization converter under two-antisymmetric-beam illumination. Its high performance, including broad bandwidth, high transmittance and high efficiency, originates from the combination of two interference processes: the Fabry-Pérot-like cavity effect between two metallic patterned layers and coherent excitations of spatially separated subwavelength resonators. Terahertz (THz) experiments show good agreement with numerical simulations.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"46 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73814953","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510144
A. Arzhannikov, N. Ginzburg, P. V. Kalinin, S. Kuznetsov, N. Peskov, A. Sergeev, S. Sinitsky, Vasiliy D. Stenanov, V. Y. Zaslavskv
Project of a two-stage cascade THz FEL driven by intense parallel sheet beams is under development at the ELMI accelerator. For powering this two-channel scheme, planar 75 GHz FEM-oscillator with 2D distributed feedback, which was successfully realized in previous experiments, is planned to be used. Pumping wave generated in this first section is transported by the coupling waveguides to the second channel and scattered into the THz radiation at the second parallel electron beam. Results of theoretical analysis, computer simulations and recent experimental studies of this FEL scheme are presented.
{"title":"Powerful two-stage THz-range FEL based on intense parallel sheet beams: Design, simulations and recent results","authors":"A. Arzhannikov, N. Ginzburg, P. V. Kalinin, S. Kuznetsov, N. Peskov, A. Sergeev, S. Sinitsky, Vasiliy D. Stenanov, V. Y. Zaslavskv","doi":"10.1109/IRMMW-THZ.2018.8510144","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510144","url":null,"abstract":"Project of a two-stage cascade THz FEL driven by intense parallel sheet beams is under development at the ELMI accelerator. For powering this two-channel scheme, planar 75 GHz FEM-oscillator with 2D distributed feedback, which was successfully realized in previous experiments, is planned to be used. Pumping wave generated in this first section is transported by the coupling waveguides to the second channel and scattered into the THz radiation at the second parallel electron beam. Results of theoretical analysis, computer simulations and recent experimental studies of this FEL scheme are presented.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"9 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73930206","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510431
A. Keil, N. Schreiner, F. Friederich
Thickness measurements using terahertz waves have received great attention in the area of industrial nondestructive testing. Currently these technologies are limited to individual thickness measurements using scanning probes. Within this contribution we demonstrate that a state of the art terahertz imaging system based on a multistatic sparse array can be used to acquire real-time data und to establish thicknesses of bulk materials on an industrial scale. We are discussing extensions how to go below the inherent resolution determined by the bandwidth of the signal.
{"title":"Thickness Measurements with Multistatic Sparse Arrays","authors":"A. Keil, N. Schreiner, F. Friederich","doi":"10.1109/IRMMW-THZ.2018.8510431","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510431","url":null,"abstract":"Thickness measurements using terahertz waves have received great attention in the area of industrial nondestructive testing. Currently these technologies are limited to individual thickness measurements using scanning probes. Within this contribution we demonstrate that a state of the art terahertz imaging system based on a multistatic sparse array can be used to acquire real-time data und to establish thicknesses of bulk materials on an industrial scale. We are discussing extensions how to go below the inherent resolution determined by the bandwidth of the signal.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"37 1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74098259","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510165
Artem G. Terentvuk, A. Rozhnev, N. M. Rvskin, A. Starodubov, V. Galushka, A. Pavlov
Folded waveguide (FW) is a promising type of slow-wave structure (SWS) for millimeter-wave traveling-wave tubes. Results of development of several millimeter-band FW SWSs are presented. SWS circuits at Q- and V -band are fabricated by CNC-machining. Cold electromagnetic parameters of the SWS characteristics are simulated and reasonable agreement with the results of measurements is observed. Small-signal and large-signal gain is calculated.
{"title":"Development and Modeling of Folded-Waveguide Slow-Wave Structures for Millimeter-Band Traveling-Wave Tubes","authors":"Artem G. Terentvuk, A. Rozhnev, N. M. Rvskin, A. Starodubov, V. Galushka, A. Pavlov","doi":"10.1109/IRMMW-THZ.2018.8510165","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510165","url":null,"abstract":"Folded waveguide (FW) is a promising type of slow-wave structure (SWS) for millimeter-wave traveling-wave tubes. Results of development of several millimeter-band FW SWSs are presented. SWS circuits at Q- and V -band are fabricated by CNC-machining. Cold electromagnetic parameters of the SWS characteristics are simulated and reasonable agreement with the results of measurements is observed. Small-signal and large-signal gain is calculated.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"11 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79289836","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510283
K. Kurihara, K. Kusama, F. Kuwashima, O. Morikawa, K. Yamamoto, H. Kitahara, M. Tani
Plasmonic theory is applied to the E-plane sectoral horn antennas discussed in microwave technology where metals is treated as perfect conductors approximately. The theory enables us to reconsider the sectoral horn antennas with a finite metallic permittivity for more realistic estimation of an enhancement factor of electric field that enters at the mouth of the sectoral horn antennas through the throat to the parallel- plate waveguide as a limit case of the rectangular waveguide.
{"title":"Enhancement of Electric Field in E-plane Sectoral Horn Antennas Reconsidered by Plasmonic Theory","authors":"K. Kurihara, K. Kusama, F. Kuwashima, O. Morikawa, K. Yamamoto, H. Kitahara, M. Tani","doi":"10.1109/IRMMW-THZ.2018.8510283","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510283","url":null,"abstract":"Plasmonic theory is applied to the E-plane sectoral horn antennas discussed in microwave technology where metals is treated as perfect conductors approximately. The theory enables us to reconsider the sectoral horn antennas with a finite metallic permittivity for more realistic estimation of an enhancement factor of electric field that enters at the mouth of the sectoral horn antennas through the throat to the parallel- plate waveguide as a limit case of the rectangular waveguide.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"67 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85328983","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510060
N. Schreiner, W. Sauer-Greff, R. Urbansky, Fabian Friedcrich
Broadband laser based terahertz systems become currently established for inline multilayer paint inspection in the automotive industry. This technology has also proven to be suitable for inspections of certain multilayer plastic structures with up to a few millimeters of thickness. We present a complementary technique for the measurement of dielectric multilayer structures with thicknesses of sub millimeter to several centimeters, using frequency-modulated continuous-wave electronic transceivers. In order to resolve layers below the inherent resolution limit by the modulation bandwidth, we take advantage of model-based signal processing techniques.
{"title":"All-Electronic High-Resolution Terahertz Thickness Measurements","authors":"N. Schreiner, W. Sauer-Greff, R. Urbansky, Fabian Friedcrich","doi":"10.1109/IRMMW-THZ.2018.8510060","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510060","url":null,"abstract":"Broadband laser based terahertz systems become currently established for inline multilayer paint inspection in the automotive industry. This technology has also proven to be suitable for inspections of certain multilayer plastic structures with up to a few millimeters of thickness. We present a complementary technique for the measurement of dielectric multilayer structures with thicknesses of sub millimeter to several centimeters, using frequency-modulated continuous-wave electronic transceivers. In order to resolve layers below the inherent resolution limit by the modulation bandwidth, we take advantage of model-based signal processing techniques.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"56 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85394317","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510497
I. Dan, Christopher M. Grotsch, S. Shiba, I. Kallfass
Monolithic integrated circuits operating in the low terahertz region, at frequencies beyond 275 GHz, have been successfully employed in communication systems, demonstrating that high data rates can be achieved. This paper analyzes and identifies one of the main factors that influence one important impairment of a 300 GHz wireless system: the isolation of the local oscillator. Improving this isolation will have a positive effect on the quality of the data transmissions, allowing better figures of merit, like error vector magnitude and bit error rates and higher order modulation formats, which will result in an even higher data rate.
{"title":"Considerations on Local Oscillator Isolation in a Terahertz Wireless Link Used for Future Communication Systems","authors":"I. Dan, Christopher M. Grotsch, S. Shiba, I. Kallfass","doi":"10.1109/IRMMW-THZ.2018.8510497","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510497","url":null,"abstract":"Monolithic integrated circuits operating in the low terahertz region, at frequencies beyond 275 GHz, have been successfully employed in communication systems, demonstrating that high data rates can be achieved. This paper analyzes and identifies one of the main factors that influence one important impairment of a 300 GHz wireless system: the isolation of the local oscillator. Improving this isolation will have a positive effect on the quality of the data transmissions, allowing better figures of merit, like error vector magnitude and bit error rates and higher order modulation formats, which will result in an even higher data rate.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"45 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79497166","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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