Pub Date : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510466
S. Bretin, M. Billet, E. Peytavit, F. Vaurette, C. Coinon, X. Wallart, J. Lampin, M. Zegaoui, G. Ducournau, M. Zaknoune
Uni-travelling carrier photodiode (UTC-PD) with different top optical and electrical accesses are proposed towards optical polarization sensitivity reduction. With the optimized structure, only 1 percent dependence in optical polarization is obtained while ensuring good RF access. Measurements up to 110 GHz are presented at −1V bias and 25.3 mW optical power.
{"title":"Nano-structured top contact with low optical polarization dependence for THz generation using photodiodes","authors":"S. Bretin, M. Billet, E. Peytavit, F. Vaurette, C. Coinon, X. Wallart, J. Lampin, M. Zegaoui, G. Ducournau, M. Zaknoune","doi":"10.1109/IRMMW-THZ.2018.8510466","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510466","url":null,"abstract":"Uni-travelling carrier photodiode (UTC-PD) with different top optical and electrical accesses are proposed towards optical polarization sensitivity reduction. With the optimized structure, only 1 percent dependence in optical polarization is obtained while ensuring good RF access. Measurements up to 110 GHz are presented at −1V bias and 25.3 mW optical power.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"18 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":"79775101","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.2018.8510420
P. Sai, D. But, K. Nowakowski-Szkudlarek, J. Przybytek, P. Prystawko, I. Yahniuk, P. Wiśniewski, B. Stonio, M. Słowikowski, S. Rumyantsev, W. Knap, G. Cywiński
We report on comparison studies between a novel transistor like device and two dimensional Fin Field-Effect transistor towards their applications in a terahertz resonant detector. Both device structures have been fabricated on the same wafer of GaN/AIGaN epistructure during one processing run. The proposed here the transistor-like structure has two side Schottky gates, which can be biased towards complete pinch-off the 2DEG channel in this device. At certain conditions, near to pinch-off region, it is possible to obtain one dimensional current flow. This feature is especially attractive for THz resonant detector approach, which will be discussed in details.
{"title":"A1GaN/GaN Field Effect Transistors Based on Lateral Schottky Barrier Gates as Millimeter Wave Detectors","authors":"P. Sai, D. But, K. Nowakowski-Szkudlarek, J. Przybytek, P. Prystawko, I. Yahniuk, P. Wiśniewski, B. Stonio, M. Słowikowski, S. Rumyantsev, W. Knap, G. Cywiński","doi":"10.1109/IRMMW-THZ.2018.8510420","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510420","url":null,"abstract":"We report on comparison studies between a novel transistor like device and two dimensional Fin Field-Effect transistor towards their applications in a terahertz resonant detector. Both device structures have been fabricated on the same wafer of GaN/AIGaN epistructure during one processing run. The proposed here the transistor-like structure has two side Schottky gates, which can be biased towards complete pinch-off the 2DEG channel in this device. At certain conditions, near to pinch-off region, it is possible to obtain one dimensional current flow. This feature is especially attractive for THz resonant detector approach, which will be discussed in details.","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":"84644091","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.2018.8510436
Rui Zhang, Qingming Cherr, Kai Liu, Zefeng Chen, Kaidi Li, Jianbin Xu, E. Pickwell‐MacPherson
We present a novel multi-microfluidic-channel metamaterial biosensor (MCMB) for highly sensitive terahertz (THz) sensing of tiny volume liquid samples. The multi-channels are set mainly in the strong electric field enhancement area of the metamaterial, which significantly decreases the liquid amount and enhances interaction between the sensing targets and the THz wave (thus increasing the sensitivity). The water sensing results demonstrate the effectiveness of this proposed design and the great potential in THz biosensing.
{"title":"Terahertz Microfluidic Metamaterial Biosensor for Tiny Volume Liquid Samples","authors":"Rui Zhang, Qingming Cherr, Kai Liu, Zefeng Chen, Kaidi Li, Jianbin Xu, E. Pickwell‐MacPherson","doi":"10.1109/IRMMW-THZ.2018.8510436","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510436","url":null,"abstract":"We present a novel multi-microfluidic-channel metamaterial biosensor (MCMB) for highly sensitive terahertz (THz) sensing of tiny volume liquid samples. The multi-channels are set mainly in the strong electric field enhancement area of the metamaterial, which significantly decreases the liquid amount and enhances interaction between the sensing targets and the THz wave (thus increasing the sensitivity). The water sensing results demonstrate the effectiveness of this proposed design and the great potential in THz biosensing.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"70 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":"83796214","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.2018.8510174
O. Dumbrajs, G. Nusinovich
It is conventionally assumed that the gyrotrons can operate either in the regime of soft self-excitation, where the beam current exceeds the start current, or in the regime of hard excitation, where the beam current is lower than the start current. The authors have found one more possibility of gyrotron operation: in the region where there is no start current at all. Although it is not clear whether this region represents a special interest for gyrotron operation, it can be useful to learn that such opportunity may exist and can be used for interpreting some experimental results.
{"title":"Gyrotron Operation in the ‘No-Start-Current’ Zone","authors":"O. Dumbrajs, G. Nusinovich","doi":"10.1109/IRMMW-THZ.2018.8510174","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510174","url":null,"abstract":"It is conventionally assumed that the gyrotrons can operate either in the regime of soft self-excitation, where the beam current exceeds the start current, or in the regime of hard excitation, where the beam current is lower than the start current. The authors have found one more possibility of gyrotron operation: in the region where there is no start current at all. Although it is not clear whether this region represents a special interest for gyrotron operation, it can be useful to learn that such opportunity may exist and can be used for interpreting some experimental results.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"51 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":"82657093","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.2018.8510387
Yu. S. Oparina, A. Savilov
Short dense electron bunches produced by modern photo-injectors are attractive from the viewpoint of realization of powerful and effective sources of THz radiation based on spontaneous coherent radiation from bunches. This type of emission is realized, if the effective phase bunch size with respect to the wave is small enough. Therefore, the duration of the radiation process is limited due to the increase in the bunch size under effect of the Coulomb repulsion. In this work we show that this problem can be solved by using the cyclotron mechanism of the spontaneous radiation due to the compensation of the Coulomb repulsion in the cyclotron phase space.
{"title":"Spontaneous Coherent Cyclotron THz Super-Radiation from a Dense Electron Bunch","authors":"Yu. S. Oparina, A. Savilov","doi":"10.1109/IRMMW-THZ.2018.8510387","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510387","url":null,"abstract":"Short dense electron bunches produced by modern photo-injectors are attractive from the viewpoint of realization of powerful and effective sources of THz radiation based on spontaneous coherent radiation from bunches. This type of emission is realized, if the effective phase bunch size with respect to the wave is small enough. Therefore, the duration of the radiation process is limited due to the increase in the bunch size under effect of the Coulomb repulsion. In this work we show that this problem can be solved by using the cyclotron mechanism of the spontaneous radiation due to the compensation of the Coulomb repulsion in the cyclotron phase space.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"6 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":"80388896","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.2018.8509993
T. Krapivnitckaia, A. Bogdashov, A. N. Denisenko, M. Glyavin, N. Peskov, L. Semenycheva, Dmitry L. Vorozhtcov
Development of the systems for research of effect of powerful microwave radiation on various chemical materials and bio- agricultural objects is carried out in collaboration between IAP RAS and Nizhegorodsky University. For investigation of the process of microwave pyrolysis the laboratory set-up based on a coaxial resonator and irradiated by 2.45 GHz industrial magnetron was constructed. The paper presents results of the thermodynamic and electromagnetic simulations of this system and results of experimental studies of the microwave pyrolysis of peat. Samples of gas, liquid, and solid phases were obtained and analyzed.
{"title":"Microwave pyrolysis of peat: simulations and experimental results","authors":"T. Krapivnitckaia, A. Bogdashov, A. N. Denisenko, M. Glyavin, N. Peskov, L. Semenycheva, Dmitry L. Vorozhtcov","doi":"10.1109/IRMMW-THZ.2018.8509993","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8509993","url":null,"abstract":"Development of the systems for research of effect of powerful microwave radiation on various chemical materials and bio- agricultural objects is carried out in collaboration between IAP RAS and Nizhegorodsky University. For investigation of the process of microwave pyrolysis the laboratory set-up based on a coaxial resonator and irradiated by 2.45 GHz industrial magnetron was constructed. The paper presents results of the thermodynamic and electromagnetic simulations of this system and results of experimental studies of the microwave pyrolysis of peat. Samples of gas, liquid, and solid phases were obtained and analyzed.","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":"80667230","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.2018.8510499
K. Nawata, Y. Tokizane, Y. Takida, T. Notake, Zhengli Han, A. K. Dal Bosco, M. Koyama, H. Minamide
We demonstrated a mirrorless terahertz (THz)-wave parametric oscillator (TPO) based on backward optical parametric oscillation. The mirrorless TPO has no cavity mirrors because of inhibit feedback effect inside a periodically poled lithium niobite (PPLN). The oscillator offered wide tunability, mode-hop free tuning, narrow linewidth, and high conversion efficiency. Prototype of mirrorless TPO has the dimension of 80 mm with 30 mm square and the weight was about 110 g. The prototype indicates that mirrorless TPO realizes compact and robust THz-wave sources with excellent features based on nonlinear wavelength conversion.
{"title":"A Mirrorless Terahertz- Wave Parametric Oscillator","authors":"K. Nawata, Y. Tokizane, Y. Takida, T. Notake, Zhengli Han, A. K. Dal Bosco, M. Koyama, H. Minamide","doi":"10.1109/IRMMW-THZ.2018.8510499","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510499","url":null,"abstract":"We demonstrated a mirrorless terahertz (THz)-wave parametric oscillator (TPO) based on backward optical parametric oscillation. The mirrorless TPO has no cavity mirrors because of inhibit feedback effect inside a periodically poled lithium niobite (PPLN). The oscillator offered wide tunability, mode-hop free tuning, narrow linewidth, and high conversion efficiency. Prototype of mirrorless TPO has the dimension of 80 mm with 30 mm square and the weight was about 110 g. The prototype indicates that mirrorless TPO realizes compact and robust THz-wave sources with excellent features based on nonlinear wavelength conversion.","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":"80730899","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.2018.8510149
V. Sankin, A. Andrianov, A. Petrov, A. Zakhar'in, P. Shkrebiy, S. Nagalyuk
Results of the study of the terahertz electroluminescence from 8H-, 6H- and 4H-SiC natural superlattices (NSL) under action of strong electrical field applied along the natural superlattice axis are reported. It is shown that the threshold field of the appearance of THz BO emission and the threshold field for the negative differential conductivity for these SiC NSLs increase linearly with the width of the first miniband of these NSLs. This observation is a crucial factor in support of the BO nature of the terahertz electroluminescence and the negative differential conductivity for these SiC NSLs.
{"title":"Bloch Oscillations Signature of THz Electroluminescence from SiC Natural Superlattices","authors":"V. Sankin, A. Andrianov, A. Petrov, A. Zakhar'in, P. Shkrebiy, S. Nagalyuk","doi":"10.1109/IRMMW-THZ.2018.8510149","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510149","url":null,"abstract":"Results of the study of the terahertz electroluminescence from 8H-, 6H- and 4H-SiC natural superlattices (NSL) under action of strong electrical field applied along the natural superlattice axis are reported. It is shown that the threshold field of the appearance of THz BO emission and the threshold field for the negative differential conductivity for these SiC NSLs increase linearly with the width of the first miniband of these NSLs. This observation is a crucial factor in support of the BO nature of the terahertz electroluminescence and the negative differential conductivity for these SiC NSLs.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"100 6 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":"83329455","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.2018.8510461
Zoltan Vilaaosh, A. Lajevardipour, A. Wood
Human tissues have a high coefficient of absorption in the 60–300 GHz range. This focuses the study of human radiation exposure in this band to the skin and the cornea. The capacity of 60–300 GHz radiation to access the deeper parts of the ear has not been studied. Simulations show that over 90 % of the radiation that is presented parallel to the ear canal penetrates to 20mm into the canal at 60 and 90 GHz. The structures of the outer ear are highly protective, reducing penetration to 20%. At 300 GHz, the canal develops areas of up to 190% of the incident intensity, reducing to 150% when the outer ear structures are represented. These findings have important implications for the design of devices emitting 60–300 GHz radiation.
{"title":"Simulations of the Penetration of 60–300 GHz Radiation into the Human Ear","authors":"Zoltan Vilaaosh, A. Lajevardipour, A. Wood","doi":"10.1109/IRMMW-THZ.2018.8510461","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510461","url":null,"abstract":"Human tissues have a high coefficient of absorption in the 60–300 GHz range. This focuses the study of human radiation exposure in this band to the skin and the cornea. The capacity of 60–300 GHz radiation to access the deeper parts of the ear has not been studied. Simulations show that over 90 % of the radiation that is presented parallel to the ear canal penetrates to 20mm into the canal at 60 and 90 GHz. The structures of the outer ear are highly protective, reducing penetration to 20%. At 300 GHz, the canal develops areas of up to 190% of the incident intensity, reducing to 150% when the outer ear structures are represented. These findings have important implications for the design of devices emitting 60–300 GHz radiation.","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":"82223799","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.2018.8510155
Moe Kashima, S. Tsuchikawa, T. Inagaki
This study attempts simultaneous prediction of grain angle, density and moisture content by THz time domain spectroscopy (THz-TDS) which has sufficient spatial resolution and transparency for wood. Terahertz waves transmitted through wood contain information on moisture content, density, grain angle and crystallinity of the sample. In this study, we measured spectra of 14 kinds of wood (5 soft wood, 9 hard woods) at various moisture contents and air-dried douglas fir while rotating the sample against the polarization of the terahertz wave. It was shown that the fiber orientation, density and moisture content of wood can be predicted simultaneously from the calculated complex permittivity.
{"title":"Quality Evaluation of Engineered Wood by THz-TDS","authors":"Moe Kashima, S. Tsuchikawa, T. Inagaki","doi":"10.1109/IRMMW-THZ.2018.8510155","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510155","url":null,"abstract":"This study attempts simultaneous prediction of grain angle, density and moisture content by THz time domain spectroscopy (THz-TDS) which has sufficient spatial resolution and transparency for wood. Terahertz waves transmitted through wood contain information on moisture content, density, grain angle and crystallinity of the sample. In this study, we measured spectra of 14 kinds of wood (5 soft wood, 9 hard woods) at various moisture contents and air-dried douglas fir while rotating the sample against the polarization of the terahertz wave. It was shown that the fiber orientation, density and moisture content of wood can be predicted simultaneously from the calculated complex permittivity.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"47 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":"81329709","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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