Pub Date : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510053
S. Smimov, I. Anoshkin, D. Lioubtchenko, J. Oberhammer
Surfaces with tunable impedance are usually lossy at high frequencies, which limits the design of millimeter wave and Terahertz devices. This work experimentally demonstrates a phase shifter based on single-walled carbon nanotubes and dielectric rod waveguides in the 220–330 GHz frequency range. Thin carbon nanotube layers are used as a tunable impedance surface with the dielectric properties optically controlled by laser illumination.
{"title":"Millimeter Wave Phase Shifter Based on Optically Controlled Carbon Nanotube Layers","authors":"S. Smimov, I. Anoshkin, D. Lioubtchenko, J. Oberhammer","doi":"10.1109/IRMMW-THZ.2018.8510053","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510053","url":null,"abstract":"Surfaces with tunable impedance are usually lossy at high frequencies, which limits the design of millimeter wave and Terahertz devices. This work experimentally demonstrates a phase shifter based on single-walled carbon nanotubes and dielectric rod waveguides in the 220–330 GHz frequency range. Thin carbon nanotube layers are used as a tunable impedance surface with the dielectric properties optically controlled by laser illumination.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"235 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":"76882098","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.2018.8509919
Xu-ling Lin, Zhi Zhang, Xiaoli Ji, Zhongbo Zhu, Jianbing Zhang
In this paper, we present a portable, video rate, low-cost and high imaging quality terahertz imager which is suitable for manned spacecraft on-orbit nondestructive examination and security inspection, the imager can hand-held by astronaut or space station's robot arm, and some components test results are given.
{"title":"Manned Spacecraft Safely Nondestructive Inspection with Terahertz","authors":"Xu-ling Lin, Zhi Zhang, Xiaoli Ji, Zhongbo Zhu, Jianbing Zhang","doi":"10.1109/IRMMW-THZ.2018.8509919","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8509919","url":null,"abstract":"In this paper, we present a portable, video rate, low-cost and high imaging quality terahertz imager which is suitable for manned spacecraft on-orbit nondestructive examination and security inspection, the imager can hand-held by astronaut or space station's robot arm, and some components test results are given.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"13 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":"80927152","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.2018.8509926
H. Hanaizumi
An improved post-processing method was proposed for displaying 3-D shape of scattering sources with polarity of the echoes. The method was applied to terahertz pulse-echo measurements for a plastic plate, including three artificial defects: metal rod, air gap, and water-filled gap. The method successfully recognized the change of the dielectric property due to the defects.
{"title":"An Improved Post-Processing Method for Three-Dimensional Visualization in Terahertz Pulse-Echo Imaging","authors":"H. Hanaizumi","doi":"10.1109/IRMMW-THZ.2018.8509926","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8509926","url":null,"abstract":"An improved post-processing method was proposed for displaying 3-D shape of scattering sources with polarity of the echoes. The method was applied to terahertz pulse-echo measurements for a plastic plate, including three artificial defects: metal rod, air gap, and water-filled gap. The method successfully recognized the change of the dielectric property due to the defects.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"19 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":"80941621","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.2018.8510311
H. Xiao, Xianfei Chen, D. Xia, Pengbo Wang, Xin Qi, Xiaofeng Li
This paper proposes a repeatable 45 T pulsed magnet for THz gyrotrons, which has internal high strength metal reinforcement for faster cooling speed and longer service time. The mechanical and thermal analysis of the pulsed magnet will be presented in this paper.
{"title":"45 T Pulsed Magnets for the THz Gyrotrons","authors":"H. Xiao, Xianfei Chen, D. Xia, Pengbo Wang, Xin Qi, Xiaofeng Li","doi":"10.1109/IRMMW-THZ.2018.8510311","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510311","url":null,"abstract":"This paper proposes a repeatable 45 T pulsed magnet for THz gyrotrons, which has internal high strength metal reinforcement for faster cooling speed and longer service time. The mechanical and thermal analysis of the pulsed magnet will be presented in this paper.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"14 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":"73604413","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.2018.8510045
Kotaro Makino, Kosaku Kato, K. Takano, Y. Saito, J. Tominaga, T. Nakano, Goro Isoyarna, M. Nakajima
Intense terahertz radiation is promising for material control and understanding of the THz-matter interactions is important research topic. We irradiated Ge-Sb- Te phase change material thin films with a train of THz pulses from a free electron laser and found that the surface changes that are damage as a precursor to ablation and the undulations were induced without amorphization. The undulation pattern is thought to be a sort of laser induced periodic structure (LIPSS) that is one of important phenomena in the field of laser material processing. Absence of amorphization implies that photo- or electrical-excitation plays an important role for fast phase change operation.
{"title":"Damage and Micropattem Formation in Ge-Sb-Te Phase Change Materials Induced by Intense Terahertz Pulse Train","authors":"Kotaro Makino, Kosaku Kato, K. Takano, Y. Saito, J. Tominaga, T. Nakano, Goro Isoyarna, M. Nakajima","doi":"10.1109/IRMMW-THZ.2018.8510045","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510045","url":null,"abstract":"Intense terahertz radiation is promising for material control and understanding of the THz-matter interactions is important research topic. We irradiated Ge-Sb- Te phase change material thin films with a train of THz pulses from a free electron laser and found that the surface changes that are damage as a precursor to ablation and the undulations were induced without amorphization. The undulation pattern is thought to be a sort of laser induced periodic structure (LIPSS) that is one of important phenomena in the field of laser material processing. Absence of amorphization implies that photo- or electrical-excitation plays an important role for fast phase change operation.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"22 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":"80792534","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.2018.8510103
O. Cherkasova, M. Nazarov, Y. Kistenev, A. Shkurinov, A. Borisov, E. E. Ilyasova, A. Knyazkova
Glycation is the non-enzymatic reaction between reducing sugars, such as glucose, and proteins, lipids or nucleic acids. This process involvement in various pathologies of the human body, including diabetes and aging, and is an intensive field of research. Terahertz time-domain spectroscopy (THz-TDS) has been used for assay of glycation products. The transmission and the attenuated total internal reflection geometries have been used for measuring of a number glycation products in aqueous solutions at 0.2-2.5 THz.
{"title":"Investigation of glycation products by THz time-domain spectroscopy","authors":"O. Cherkasova, M. Nazarov, Y. Kistenev, A. Shkurinov, A. Borisov, E. E. Ilyasova, A. Knyazkova","doi":"10.1109/IRMMW-THZ.2018.8510103","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510103","url":null,"abstract":"Glycation is the non-enzymatic reaction between reducing sugars, such as glucose, and proteins, lipids or nucleic acids. This process involvement in various pathologies of the human body, including diabetes and aging, and is an intensive field of research. Terahertz time-domain spectroscopy (THz-TDS) has been used for assay of glycation products. The transmission and the attenuated total internal reflection geometries have been used for measuring of a number glycation products in aqueous solutions at 0.2-2.5 THz.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"97 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":"85901551","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.2018.8510024
A. Hernandez-Serrano, R. Mendis, Kimberlv S. Reichel, Wei Zhang, E. Castro-Camus, D. Mittleman
In this paper we theoretically and experimentally demonstrate a stepped-refractive-index convergent lens made of a parallel stack of metallic plates for terahertz frequencies based on artificial dielectrics. The lens consist of a non-uniformly spaced stack of metallic plates, forming a mirror-symmetric array of parallel-plate waveguides (PPWGs). The theoretical and experimental results show that this structure is capable of focusing a 1 cm diameter beam to a line focus of less than 4 mm for the design frequency of 0.18 THz. This structure shows that this artificial-dielectric concept is an important technology for the fabrication of next generation terahertz devices.
{"title":"Terahertz Artificial Dielectric Stepped - Refractive- Index Lens","authors":"A. Hernandez-Serrano, R. Mendis, Kimberlv S. Reichel, Wei Zhang, E. Castro-Camus, D. Mittleman","doi":"10.1109/IRMMW-THZ.2018.8510024","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510024","url":null,"abstract":"In this paper we theoretically and experimentally demonstrate a stepped-refractive-index convergent lens made of a parallel stack of metallic plates for terahertz frequencies based on artificial dielectrics. The lens consist of a non-uniformly spaced stack of metallic plates, forming a mirror-symmetric array of parallel-plate waveguides (PPWGs). The theoretical and experimental results show that this structure is capable of focusing a 1 cm diameter beam to a line focus of less than 4 mm for the design frequency of 0.18 THz. This structure shows that this artificial-dielectric concept is an important technology for the fabrication of next generation terahertz devices.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"63 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":"78292491","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.2018.8510190
Rio Ito, Kentaro Tsurui, T. Sugawara, Y. Kazama, K. Kitano, H. Maeda
We have made microwave spectroscopy to precisely measure the two-photon transition frequencies between the 5snf ${}^{1}mathrm{F}_{3}$ and the $5mathrm{s}(n+3)p {}^{1}mathrm{P}_{1}$ Rydberg states of strontium (Sr) atom in the region of $40leq nleq 49$. Revised values of quantum defects of the Sr 5snf ${}^{1} mathrm{F}_{3}$ series have been preliminary determined.
{"title":"Microwave Spectroscopy of Highly Excited 5snf1F3Rydberg States of Sr Atom","authors":"Rio Ito, Kentaro Tsurui, T. Sugawara, Y. Kazama, K. Kitano, H. Maeda","doi":"10.1109/IRMMW-THZ.2018.8510190","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510190","url":null,"abstract":"We have made microwave spectroscopy to precisely measure the two-photon transition frequencies between the 5snf <tex>${}^{1}mathrm{F}_{3}$</tex> and the <tex>$5mathrm{s}(n+3)p {}^{1}mathrm{P}_{1}$</tex> Rydberg states of strontium (Sr) atom in the region of <tex>$40leq nleq 49$</tex>. Revised values of quantum defects of the Sr 5snf <tex>${}^{1} mathrm{F}_{3}$</tex> series have been preliminary determined.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"64 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":"78354014","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.2018.8509920
M. Kinoshita, Y. Tojima, H. Iida
For millimeter (mm) wave power measurement at frequencies above 110 GHz, the use of a lower frequency power meter such as a W-band power meter with a tapered waveguide $(mathrm{PM}_{mathrm{T}})$ is convenient and practical. However, a complex analysis of the multiple-mode in the W-band waveguide is required for precise power measurement. Therefore, we calibrated a $mathrm{PM}_{mathrm{T}}$ by directly comparing it with a D-band single-mode calorimeter. This comparison does not need complex analysis because the D-band calorimeter can measure the absolute value of mm-wave power at a frequency above 110 GHz. The uncertainty of the calibration was approximately 4%. This result can be a good reference for the measurement capacity of a $mathrm{PM}_{mathrm{T}}$.
{"title":"Calibration of Power Meter with Tapered Waveguide at Frequency Range of 110–170 GHz","authors":"M. Kinoshita, Y. Tojima, H. Iida","doi":"10.1109/IRMMW-THZ.2018.8509920","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8509920","url":null,"abstract":"For millimeter (mm) wave power measurement at frequencies above 110 GHz, the use of a lower frequency power meter such as a W-band power meter with a tapered waveguide $(mathrm{PM}_{mathrm{T}})$ is convenient and practical. However, a complex analysis of the multiple-mode in the W-band waveguide is required for precise power measurement. Therefore, we calibrated a $mathrm{PM}_{mathrm{T}}$ by directly comparing it with a D-band single-mode calorimeter. This comparison does not need complex analysis because the D-band calorimeter can measure the absolute value of mm-wave power at a frequency above 110 GHz. The uncertainty of the calibration was approximately 4%. This result can be a good reference for the measurement capacity of a $mathrm{PM}_{mathrm{T}}$.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"17 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":"77778976","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.2018.8510017
Zenjiro Mita, Hiroshi Watanabe, S. Kimura
Amino acids are the most basic molecules of living bodies. We have fabricated L-alanine single crystals that has the simplest molecular structure among amino acids with chirality. The temperature dependence of the polarized optical conductivity $[sigma((mathrm{D})]$ spectrum has been measured in the terahertz (THz) to vacuum-ultraviolet (VUV) region. The strong anisotropy of vibration modes appears in polarized $sigma(omega)$ spectra because of the strong anisotropic crystal structure. Furthermore, many peaks show extremely strong temperature dependence. Their giant thermal effect can be explained by using a temperature-dependent anharmonic potential model.
{"title":"Giant Thermal Effect of Vibration Modes of Single-Crystalline Alanine","authors":"Zenjiro Mita, Hiroshi Watanabe, S. Kimura","doi":"10.1109/IRMMW-THZ.2018.8510017","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510017","url":null,"abstract":"Amino acids are the most basic molecules of living bodies. We have fabricated L-alanine single crystals that has the simplest molecular structure among amino acids with chirality. The temperature dependence of the polarized optical conductivity $[sigma((mathrm{D})]$ spectrum has been measured in the terahertz (THz) to vacuum-ultraviolet (VUV) region. The strong anisotropy of vibration modes appears in polarized $sigma(omega)$ spectra because of the strong anisotropic crystal structure. Furthermore, many peaks show extremely strong temperature dependence. Their giant thermal effect can be explained by using a temperature-dependent anharmonic potential model.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"17 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":"73168961","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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