Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567316
S. Kuznetsov, A. V. Gelfand, A. Mamrashev, F. Minakov, N. Nikolaev
The high-performance broadband terahertz polarizers based on one-dimensional metal grids on carrying thin-film polymeric substrates were developed and manufactured. THz time-domain spectroscopy was used to study their power transmission (PT) and extinction ratio (ER) in the range of 0.2–2 THz. A tandem structure of two polarizers patterned on top of 4-μm-thick polypropylene film showed the best overall characteristics: PT > 95%, while ER exceeded the system dynamic range which spanned from 107:1 to 104:1. The developed polarizers can be used for polarization-sensitive measurements of anisotropic and optically active materials.
{"title":"High-Performance Metal-Grid Polarizers on Polymeric Films for Broadband Terahertz Spectroscopy","authors":"S. Kuznetsov, A. V. Gelfand, A. Mamrashev, F. Minakov, N. Nikolaev","doi":"10.1109/IRMMW-THz50926.2021.9567316","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567316","url":null,"abstract":"The high-performance broadband terahertz polarizers based on one-dimensional metal grids on carrying thin-film polymeric substrates were developed and manufactured. THz time-domain spectroscopy was used to study their power transmission (PT) and extinction ratio (ER) in the range of 0.2–2 THz. A tandem structure of two polarizers patterned on top of 4-μm-thick polypropylene film showed the best overall characteristics: PT > 95%, while ER exceeded the system dynamic range which spanned from 107:1 to 104:1. The developed polarizers can be used for polarization-sensitive measurements of anisotropic and optically active materials.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"72 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77295602","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}
{"title":"Laser Terahertz Emission Microscope as a Killer Tool","authors":"M. Tonouchi","doi":"10.1109/IRMMW-THz50926.2021.9567150","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567150","url":null,"abstract":"A laser terahertz emission microscope (LTEM) will be a killer tool as a real-world application. Here various examples are reviewed to prove it.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"8 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89961077","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9566956
K. Kolpatzeck, Peter Krämer, Xuan-He Liu, T. Kubiczek, J. Balzer, A. Czylwik
Terahertz time-domain spectroscopy (THz-TDS) systems using a monolithic mode-locked laser diode (MLLD) as the light source have the potential to be extremely compact and fast. However, phase sensitive applications require the delay axes of related measurements to be accurately synchronized. In this work, we demonstrate an interferometric synchronization scheme with negligible hardware effort and yet high accuracy by exploiting the high repetition rate of the MLLD.
{"title":"Interferometric Time Synchronization of a Terahertz Time-Domain Spectroscopy System Driven by a Mode-Locked Laser Diode","authors":"K. Kolpatzeck, Peter Krämer, Xuan-He Liu, T. Kubiczek, J. Balzer, A. Czylwik","doi":"10.1109/IRMMW-THz50926.2021.9566956","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566956","url":null,"abstract":"Terahertz time-domain spectroscopy (THz-TDS) systems using a monolithic mode-locked laser diode (MLLD) as the light source have the potential to be extremely compact and fast. However, phase sensitive applications require the delay axes of related measurements to be accurately synchronized. In this work, we demonstrate an interferometric synchronization scheme with negligible hardware effort and yet high accuracy by exploiting the high repetition rate of the MLLD.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"15 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90900978","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9566905
D. Hakobyan, M. Hamdi, O. Redon, Anthony Ballestero, Alexis Mayaudon, Laurence Boyer, O. Durand, E. Abraham
We measured the dielectric constants of alumina ceramic samples with non-destructive THz time-domain spectroscopy. Using an effective medium approximation, we demonstrated that the relative permittivity can be used to evaluate the porous alumina samples, with porosity fractions ranging from 0% to 20% per volume. This result can be used to control sample porosity, a key material parameter related to mechanical strength under compression load, hardness and wear resistance, or thermal stability.
{"title":"Non-destructive evaluation of ceramic porosity using terahertz time-domain spectroscopy","authors":"D. Hakobyan, M. Hamdi, O. Redon, Anthony Ballestero, Alexis Mayaudon, Laurence Boyer, O. Durand, E. Abraham","doi":"10.1109/IRMMW-THz50926.2021.9566905","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566905","url":null,"abstract":"We measured the dielectric constants of alumina ceramic samples with non-destructive THz time-domain spectroscopy. Using an effective medium approximation, we demonstrated that the relative permittivity can be used to evaluate the porous alumina samples, with porosity fractions ranging from 0% to 20% per volume. This result can be used to control sample porosity, a key material parameter related to mechanical strength under compression load, hardness and wear resistance, or thermal stability.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"37 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89594542","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567266
Wulin Tong, Yulu Chen, Bingbing Wang, Chuansheng Zhang, Huiyuan Cui, Weiyi Ma, Hong Zhou, Xiaodong Wang
Terahertz band detection technology is widely researched, for it brings chemical composition and material quality information of the object. In this work, the metal gratings/Si Blocked-impurity-band (BIB) hybrid structure is proposed. Then, we fabricate two devices with different metallic gratings and one without metallic gratings. The three different devices can response to different wavebands. According to the Fourier spectrum result, the peak wavelengths of the three devices are 15.86, 18.92 and 26 μm, respectively. Our work successfully realizes the modulation of photoelectric response wavelength and provides a novel THz detector for the application of national security, astronomical observation and life sciences.
{"title":"The Response Wavelength Modulation of Terahertz Detector based on Metal Gratings/Si Blocked-impurity-band Hybrid Structure","authors":"Wulin Tong, Yulu Chen, Bingbing Wang, Chuansheng Zhang, Huiyuan Cui, Weiyi Ma, Hong Zhou, Xiaodong Wang","doi":"10.1109/IRMMW-THz50926.2021.9567266","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567266","url":null,"abstract":"Terahertz band detection technology is widely researched, for it brings chemical composition and material quality information of the object. In this work, the metal gratings/Si Blocked-impurity-band (BIB) hybrid structure is proposed. Then, we fabricate two devices with different metallic gratings and one without metallic gratings. The three different devices can response to different wavebands. According to the Fourier spectrum result, the peak wavelengths of the three devices are 15.86, 18.92 and 26 μm, respectively. Our work successfully realizes the modulation of photoelectric response wavelength and provides a novel THz detector for the application of national security, astronomical observation and life sciences.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89639940","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567133
Niankang Li, H. Yin, Zhuoyun Li, D. Jia, Zhang Shen, Wenxiang Wang, Yanyu Wei, Lingna Yue, Jin Xu, G. Zhao
Driven by success in areas such as computer vision and natural language processing, attempts have been made in this work to combine deep learning with the large signal of the Traveling Wave Tube (TWT) to assist in predicting the output performance of the tube and advancing the pre-design of TWT. By feeding the trained artificial neural network with several feature parameters, the output power with the tube length can be predicted.
{"title":"The Study of Traveling Wave Tube Large Signal Model Based on Machine Learning","authors":"Niankang Li, H. Yin, Zhuoyun Li, D. Jia, Zhang Shen, Wenxiang Wang, Yanyu Wei, Lingna Yue, Jin Xu, G. Zhao","doi":"10.1109/IRMMW-THz50926.2021.9567133","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567133","url":null,"abstract":"Driven by success in areas such as computer vision and natural language processing, attempts have been made in this work to combine deep learning with the large signal of the Traveling Wave Tube (TWT) to assist in predicting the output performance of the tube and advancing the pre-design of TWT. By feeding the trained artificial neural network with several feature parameters, the output power with the tube length can be predicted.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90112284","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567405
Jiuzhou Han, Qingyuan Yao, Pandeng Wang, Jingsuo He, Bo Su, Cunlin Zhang
This paper presents a fusion of optical fiber transmission with terahertz wireless communication system scheme. One of a pair of SFP optical module is used to process the digital signal generated by AWG (arbitrary waveform generator), which is transmitted by optical fiber for long distance. Another SFP optical module completes the photoelectric conversion of the signal and inputs the signal to the terahertz frequency conversion module for wireless transmission. The code rate is 1.25 Gbps, the carrier frequency is 300 GHz and the modulation mode is QPSK. The results were observed through the eye diagram of the signal received by the oscilloscope. The quality of the eye diagram is well, which indicates that the terahertz over fiber wireless communication has practical significance for indoor high-speed access and other application scenarios.
{"title":"300GHz Terahertz Transmission Scheme Based on SFP Optical Fiber Module","authors":"Jiuzhou Han, Qingyuan Yao, Pandeng Wang, Jingsuo He, Bo Su, Cunlin Zhang","doi":"10.1109/IRMMW-THz50926.2021.9567405","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567405","url":null,"abstract":"This paper presents a fusion of optical fiber transmission with terahertz wireless communication system scheme. One of a pair of SFP optical module is used to process the digital signal generated by AWG (arbitrary waveform generator), which is transmitted by optical fiber for long distance. Another SFP optical module completes the photoelectric conversion of the signal and inputs the signal to the terahertz frequency conversion module for wireless transmission. The code rate is 1.25 Gbps, the carrier frequency is 300 GHz and the modulation mode is QPSK. The results were observed through the eye diagram of the signal received by the oscilloscope. The quality of the eye diagram is well, which indicates that the terahertz over fiber wireless communication has practical significance for indoor high-speed access and other application scenarios.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"15 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73537258","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9566992
Tianzhong Zhang, Xiao-dong Chen, Sheng Yu
A This paper presents our investigation into a W-band magnetron that consists of 12 pairs of rising-sun anode cavities and an axial funnel-to-waveguide output structure for improving mode separation and obtaining an efficient output power extraction. The EM simulation shows that the separation between π-mode and adjacent modes is more than 2GHz and the external Q value of π-mode is sufficient high for a stable operation in the optimized design. The ‘hot-test’ simulation shows that the magnetron is capable of delivering a maximum output power of 180 kW with an operation efficiency of 56.6% at 94.1GHz, under a moderate anode voltage of 31.9kV and magnetic field of 1.18Tesla.
{"title":"Design of a W-band rising-sun anode magnetron","authors":"Tianzhong Zhang, Xiao-dong Chen, Sheng Yu","doi":"10.1109/IRMMW-THz50926.2021.9566992","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566992","url":null,"abstract":"A This paper presents our investigation into a W-band magnetron that consists of 12 pairs of rising-sun anode cavities and an axial funnel-to-waveguide output structure for improving mode separation and obtaining an efficient output power extraction. The EM simulation shows that the separation between π-mode and adjacent modes is more than 2GHz and the external Q value of π-mode is sufficient high for a stable operation in the optimized design. The ‘hot-test’ simulation shows that the magnetron is capable of delivering a maximum output power of 180 kW with an operation efficiency of 56.6% at 94.1GHz, under a moderate anode voltage of 31.9kV and magnetic field of 1.18Tesla.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"285 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76862223","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567132
Xuequan Chen, S. Fan, Jiarui Wang, E. Pickwell‐MacPherson
Melamine resin sponges have a porous cell structure on the micrometer scale, comparable to the terahertz wavelength. Hydrating the sponge with water introduces a micro-scale rough surface which greatly attenuates the terahertz reflection. When combined with the high absorption of water, the hydrated sponge shows a perfect shielding characteristic by reflecting less than 1% of the light intensity in 0.75-3.5 THz.
{"title":"Terahertz Shielding Enabled by the Micro-Porous Structure of Melamine Resin Sponge","authors":"Xuequan Chen, S. Fan, Jiarui Wang, E. Pickwell‐MacPherson","doi":"10.1109/IRMMW-THz50926.2021.9567132","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567132","url":null,"abstract":"Melamine resin sponges have a porous cell structure on the micrometer scale, comparable to the terahertz wavelength. Hydrating the sponge with water introduces a micro-scale rough surface which greatly attenuates the terahertz reflection. When combined with the high absorption of water, the hydrated sponge shows a perfect shielding characteristic by reflecting less than 1% of the light intensity in 0.75-3.5 THz.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78022968","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567121
Xu Zeng, Yichi Zhang, Jinjun Feng
To satisfy the requirement of the RF output in mega-watts level of the 170GHz gyrotrons. A design of a two-stage depressed collector with the radial magnetic field for 1MW, 170GHz gyrotrons for increasing the efficiency and the power capacity of the tube has been presented. The simulation results indicate that the total efficiency of the tube with the design could increase from 31% to 89% significantly.
{"title":"Design of Two-Stage Depressed Collector for 170GHz Mega-watts Gyrotrons","authors":"Xu Zeng, Yichi Zhang, Jinjun Feng","doi":"10.1109/IRMMW-THz50926.2021.9567121","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567121","url":null,"abstract":"To satisfy the requirement of the RF output in mega-watts level of the 170GHz gyrotrons. A design of a two-stage depressed collector with the radial magnetic field for 1MW, 170GHz gyrotrons for increasing the efficiency and the power capacity of the tube has been presented. The simulation results indicate that the total efficiency of the tube with the design could increase from 31% to 89% significantly.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"96 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78081417","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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