Pub Date : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6104934
D. Khokhlov
Physical principles of operation of the photodetecting devices based on the group III-doped IV-VI semiconductors are presented. We report on the performance of lead telluride-based single direct terahertz detectors. Architecture of a system for passive terahertz vision of room-temperature objects is presented.
{"title":"Direct detectors for passive terahertz photodetecting systems based on Pb1−xSnxTe(In)","authors":"D. Khokhlov","doi":"10.1109/IRMMW-THZ.2011.6104934","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104934","url":null,"abstract":"Physical principles of operation of the photodetecting devices based on the group III-doped IV-VI semiconductors are presented. We report on the performance of lead telluride-based single direct terahertz detectors. Architecture of a system for passive terahertz vision of room-temperature objects is presented.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"40 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87140667","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 : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6104760
H. Richter, A. Semenov, S. Pavlov, L. Mahler, A. Tredicucci, H. Beere, D. Ritchie, K. Il'in, M. Siegel, H. Hubers
As part of a study for a second generation heterodyne spectrometer on SOFIA we are developing a 2.5-THz frontend which is implemented in a pulse-tube cooler. It consists of a quantum-cascade laser as local oscillator and a phonon-cooled NbN hot electron bolometric mixer. Frequency stabilization to below 300 kHz full width at half maximum is achieved by locking to a molecular absorption line. We will present the design and performance of the frontend and discuss the prospects for an application on board of SOFIA.
{"title":"Frontend for a 2.5-THz heterodyne spectrometer without liquid cryogen","authors":"H. Richter, A. Semenov, S. Pavlov, L. Mahler, A. Tredicucci, H. Beere, D. Ritchie, K. Il'in, M. Siegel, H. Hubers","doi":"10.1109/IRMMW-THZ.2011.6104760","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104760","url":null,"abstract":"As part of a study for a second generation heterodyne spectrometer on SOFIA we are developing a 2.5-THz frontend which is implemented in a pulse-tube cooler. It consists of a quantum-cascade laser as local oscillator and a phonon-cooled NbN hot electron bolometric mixer. Frequency stabilization to below 300 kHz full width at half maximum is achieved by locking to a molecular absorption line. We will present the design and performance of the frontend and discuss the prospects for an application on board of SOFIA.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"85 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83885226","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 : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6105024
T. de Graauw
The Atacama Large Millimeter/submillimeter Array (ALMA), a collaboration between East Asia, Europe and North America and now under construction, will be a single research instrument composed of 66 high-precision antennas located near Cerro Chajnantor, at 5000m in the Chilean Andes. Although the interferometer is not yet completed, early science observations will already start in September 2011 with 16 antennas.
{"title":"The Atacama Large Millimeter/submillimeter Array","authors":"T. de Graauw","doi":"10.1109/IRMMW-THZ.2011.6105024","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105024","url":null,"abstract":"The Atacama Large Millimeter/submillimeter Array (ALMA), a collaboration between East Asia, Europe and North America and now under construction, will be a single research instrument composed of 66 high-precision antennas located near Cerro Chajnantor, at 5000m in the Chilean Andes. Although the interferometer is not yet completed, early science observations will already start in September 2011 with 16 antennas.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"7 1","pages":"1-4"},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86750525","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 : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6105111
G. Andonian, E. Hemsing, A. Murokh, A. Ovodenko, M. Ruelas, R. Tikhoplav
The real-time interferometer is a diagnostic for advanced accelerator and light source facilities the employ high-brightness beams. The diagnostic provides single-shot measurements of the electron beam temporal profile by analyzing the emitted terahertz radiation from coherent radiation generation processes. Here we present preliminary data to ascertain the viability of the diagnostic that will be commissioned at the Brookhaven National Laboratory Accelerator Test Facility.
{"title":"Bunch length measurements for advanced accelerator facilities with a single-shot interferometer","authors":"G. Andonian, E. Hemsing, A. Murokh, A. Ovodenko, M. Ruelas, R. Tikhoplav","doi":"10.1109/IRMMW-THZ.2011.6105111","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105111","url":null,"abstract":"The real-time interferometer is a diagnostic for advanced accelerator and light source facilities the employ high-brightness beams. The diagnostic provides single-shot measurements of the electron beam temporal profile by analyzing the emitted terahertz radiation from coherent radiation generation processes. Here we present preliminary data to ascertain the viability of the diagnostic that will be commissioned at the Brookhaven National Laboratory Accelerator Test Facility.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"471 2","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91478563","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 : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6105178
J. Freeman, A. Brewer, J. Madéo, P. Cavalié, S. Dhillon, J. Tignon, H. Beere, D. Ritchie
We demonstrate the operation of broadband heterogeneous terahertz quantum cascade lasers by carefully designing sub-stacks to align at the same field. Time domain spectroscopy measurements confirm that a flat gain spectrum is present and when incorporated into metal-metal waveguides we find broadband operation over 380 GHz when metal-metal ridges with non-vertical side-walls are used.
{"title":"Heterogeneous THz quantum cascade lasers: Broadband operation","authors":"J. Freeman, A. Brewer, J. Madéo, P. Cavalié, S. Dhillon, J. Tignon, H. Beere, D. Ritchie","doi":"10.1109/IRMMW-THZ.2011.6105178","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105178","url":null,"abstract":"We demonstrate the operation of broadband heterogeneous terahertz quantum cascade lasers by carefully designing sub-stacks to align at the same field. Time domain spectroscopy measurements confirm that a flat gain spectrum is present and when incorporated into metal-metal waveguides we find broadband operation over 380 GHz when metal-metal ridges with non-vertical side-walls are used.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"134 2","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91503542","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 : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6104975
M. Wichmann, B. Scherger, S. Lippert, N. Kocic, S. Wietzke, N. Vieweg, C. Jansen, M. Scheller, T. Hochrein, I. Radovanovic, P. Heidemeyer, M. Bastian, K. Wiesauer, M. Koch
We fabricate THz lenses by compression molding of pure polymer micro powders as well as extruded polymeric compounds. In particular the latter provide higher refractive indices than pure polymers which allows for thinner lenses, higher numerical apertures and hence, better focusing. Besides, compression molding is very cost efficient.
{"title":"Terahertz lenses made by compression molding","authors":"M. Wichmann, B. Scherger, S. Lippert, N. Kocic, S. Wietzke, N. Vieweg, C. Jansen, M. Scheller, T. Hochrein, I. Radovanovic, P. Heidemeyer, M. Bastian, K. Wiesauer, M. Koch","doi":"10.1109/IRMMW-THZ.2011.6104975","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104975","url":null,"abstract":"We fabricate THz lenses by compression molding of pure polymer micro powders as well as extruded polymeric compounds. In particular the latter provide higher refractive indices than pure polymers which allows for thinner lenses, higher numerical apertures and hence, better focusing. Besides, compression molding is very cost efficient.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"6 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88903657","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 : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6104784
B. Viquerat, J. Degert, M. Tondusson, J. Létard, C. Mauriac, E. Freysz
We have measured the evolution of the THz spectrum of polymeric iron(II) spin crossover compounds within the Low-Spin/High-Spin thermal hysteresis loop in the ∼0.6–6 THz frequency range. This study enabled to evidence the large variations of both the refractive optical index and the absorption that occur during the spin state phase transition.
{"title":"Time-domain spectroscopy of spin state transition in polymeric spin crossover compounds","authors":"B. Viquerat, J. Degert, M. Tondusson, J. Létard, C. Mauriac, E. Freysz","doi":"10.1109/IRMMW-THZ.2011.6104784","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104784","url":null,"abstract":"We have measured the evolution of the THz spectrum of polymeric iron(II) spin crossover compounds within the Low-Spin/High-Spin thermal hysteresis loop in the ∼0.6–6 THz frequency range. This study enabled to evidence the large variations of both the refractive optical index and the absorption that occur during the spin state phase transition.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"17 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80537840","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 : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6105142
D. Wagner, J. Stober, F. Leuterer, F. Monaco, S. Muller, M. Munich, M. Schubert, H. Schutz, H. Zohm, M. Thumm, T. Scherer, A. Meier, D. Strauss, G. Gantenbein, J. Flamm, W. Kasparek, H. Hohnle, C. Lechte, A. Litvak, G. Denisov, A. Chirkov, L. Popov, V. Nichiporenko, V. Myasnikov, E. Tai, E. Solyanova, S. Malygin
A multi-frequency Electron Cyclotron Heating (ECRH) system is in operation at the ASDEX Upgrade tokamak, currently employing three depressed collector gyrotrons, operating at 105 and 140 GHz. The system offers a high flexibility for a variety of plasma heating and current drive experiments including remotely controlled fast beam steering and modulation.
{"title":"Operation of the multi-frequency ECRH system at ASDEX upgrade","authors":"D. Wagner, J. Stober, F. Leuterer, F. Monaco, S. Muller, M. Munich, M. Schubert, H. Schutz, H. Zohm, M. Thumm, T. Scherer, A. Meier, D. Strauss, G. Gantenbein, J. Flamm, W. Kasparek, H. Hohnle, C. Lechte, A. Litvak, G. Denisov, A. Chirkov, L. Popov, V. Nichiporenko, V. Myasnikov, E. Tai, E. Solyanova, S. Malygin","doi":"10.1109/IRMMW-THZ.2011.6105142","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105142","url":null,"abstract":"A multi-frequency Electron Cyclotron Heating (ECRH) system is in operation at the ASDEX Upgrade tokamak, currently employing three depressed collector gyrotrons, operating at 105 and 140 GHz. The system offers a high flexibility for a variety of plasma heating and current drive experiments including remotely controlled fast beam steering and modulation.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"3 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79696124","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 : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6105207
D. Stanze, T. Gobel, B. Sartorius, M. Schell
Electro-optical control of the THz phase enables instantaneous determination of THz phase and amplitude in cw THz photomixing systems. By a novel optical inline modulation technique of the THz phase, ultrafast THz measurements become possible without the drawback of phase instabilities.
{"title":"Inline electro-optical phase control for CW terahertz systems","authors":"D. Stanze, T. Gobel, B. Sartorius, M. Schell","doi":"10.1109/IRMMW-THZ.2011.6105207","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105207","url":null,"abstract":"Electro-optical control of the THz phase enables instantaneous determination of THz phase and amplitude in cw THz photomixing systems. By a novel optical inline modulation technique of the THz phase, ultrafast THz measurements become possible without the drawback of phase instabilities.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"24 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83313412","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 : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6105062
V. Ryzhii, M. Ryzhii, A. Dubinov, V. Aleshkin, V. Mitin, M. Shur, A. Satou, S. B. Tombet, T. Otsuji
We overview novel concepts of terahertz and infrared interband detectors and lasers based on single- and multiple-graphene layer structures and discuss the features of their operation and feasibility of realization.
{"title":"Concepts of terahertz and infrared devices based on graphene structures","authors":"V. Ryzhii, M. Ryzhii, A. Dubinov, V. Aleshkin, V. Mitin, M. Shur, A. Satou, S. B. Tombet, T. Otsuji","doi":"10.1109/IRMMW-THZ.2011.6105062","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105062","url":null,"abstract":"We overview novel concepts of terahertz and infrared interband detectors and lasers based on single- and multiple-graphene layer structures and discuss the features of their operation and feasibility of realization.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"18 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83551463","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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