Pub Date : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510250
G. Soylu, F. Sanjuan, E. Hérault, J. Roux, J. Coutaz, F. Levy-Bertrand, A. Monfardini
Kinetic induced detectors are used for the first time to measure time-domain THz signals generated by optical rectification or by photo-conducting antenna. We measured signals of average power as low as ~ 0.1 fW.
{"title":"Detection of Terahertz Time-Domain Signals with KIDs","authors":"G. Soylu, F. Sanjuan, E. Hérault, J. Roux, J. Coutaz, F. Levy-Bertrand, A. Monfardini","doi":"10.1109/IRMMW-THZ.2018.8510250","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510250","url":null,"abstract":"Kinetic induced detectors are used for the first time to measure time-domain THz signals generated by optical rectification or by photo-conducting antenna. We measured signals of average power as low as ~ 0.1 fW.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"28 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":"78226461","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.2018.8509934
A. Sahoo, Chan-Shan Yang, Chun-Ling Yen, Hung-Chun Lin, Yu-Jen Wang, O. Wada, C. Pan
We propose and demonstrate a liquid crystal (LC) based terahertz phase shifter with a thick (550 μm in total) bi-layer LC cell structure incorporating a thin transparent polymeric intermediate layer. The present phase shifter exhibited remarkable performance improvement. The phase shift increased from 94o to 111o; threshold and drive voltages decreased from 2.2 VRMS to 1 VRMS and from 10 VRMS to 8.4 VRMS, respectively, in comparison with those for single-layer cell structure.
{"title":"Liquid Crystal Based Terahertz Phase Shifter with Bi-Layer Structure","authors":"A. Sahoo, Chan-Shan Yang, Chun-Ling Yen, Hung-Chun Lin, Yu-Jen Wang, O. Wada, C. Pan","doi":"10.1109/IRMMW-THZ.2018.8509934","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8509934","url":null,"abstract":"We propose and demonstrate a liquid crystal (LC) based terahertz phase shifter with a thick (550 μm in total) bi-layer LC cell structure incorporating a thin transparent polymeric intermediate layer. The present phase shifter exhibited remarkable performance improvement. The phase shift increased from 94o to 111o; threshold and drive voltages decreased from 2.2 VRMS to 1 VRMS and from 10 VRMS to 8.4 VRMS, respectively, in comparison with those for single-layer cell structure.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"83 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":"76129522","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.2018.8510458
Hiroyuki S. Kato, H. Kitahara, D. Goto, T. Yasumoto, Masaki Shihara, J. Afalla, V. Mag-usara, D. Bulgarevich, Clare Escafio, K. Yamamoto, T. Furuya, M. Bakunov, E. Estacio, M. Tani
To improve the detection efficiency of electro-optic (EO) sampling of terahertz waves, we propose “polarization filtering,” where the main polarization component of the probe optical beam is suppressed after the interaction in the EO crystal. Experimentally, we achieved a factor of 2.4 increase in the EO sampling signal by the polarization filtering.
{"title":"Enhancement of THz EO Sampling Signal by Polarization Filtering","authors":"Hiroyuki S. Kato, H. Kitahara, D. Goto, T. Yasumoto, Masaki Shihara, J. Afalla, V. Mag-usara, D. Bulgarevich, Clare Escafio, K. Yamamoto, T. Furuya, M. Bakunov, E. Estacio, M. Tani","doi":"10.1109/IRMMW-THZ.2018.8510458","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510458","url":null,"abstract":"To improve the detection efficiency of electro-optic (EO) sampling of terahertz waves, we propose “polarization filtering,” where the main polarization component of the probe optical beam is suppressed after the interaction in the EO crystal. Experimentally, we achieved a factor of 2.4 increase in the EO sampling signal by the polarization filtering.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"3 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":"72731795","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.2018.8509851
Pengcheng Yin, Jin Xu, S. Fang, Ningjie Shi, G. Zhao, Wenxiang Wang, H. Yin, L. Yue, Yanyu Wei, Dazhi Li, Luqi Zhang
This paper introduces beam-wave interaction of ridged sine waveguide and the design of sheet beam electron optical for 0.22THz backward wave oscillator (BWO). The electron gun which could create a sheet electron beam with thickness 0.05mm and width 0.4mm at waist position is used. The simulation result shows that the transmission current in the tunnel with 0.09mm thick and 1.2mm width is 15mA with 100% transmission. The result of beam-wave interaction shows that the signal with 1W and 16.4GHz bandwidth could be achieved by the ridged sine waveguide BWO.
{"title":"0.22THz Ridged Sine Waveguide BWO and Sheet Beam Electron Optical System","authors":"Pengcheng Yin, Jin Xu, S. Fang, Ningjie Shi, G. Zhao, Wenxiang Wang, H. Yin, L. Yue, Yanyu Wei, Dazhi Li, Luqi Zhang","doi":"10.1109/IRMMW-THZ.2018.8509851","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8509851","url":null,"abstract":"This paper introduces beam-wave interaction of ridged sine waveguide and the design of sheet beam electron optical for 0.22THz backward wave oscillator (BWO). The electron gun which could create a sheet electron beam with thickness 0.05mm and width 0.4mm at waist position is used. The simulation result shows that the transmission current in the tunnel with 0.09mm thick and 1.2mm width is 15mA with 100% transmission. The result of beam-wave interaction shows that the signal with 1W and 16.4GHz bandwidth could be achieved by the ridged sine waveguide BWO.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"68 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":"77539247","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.2018.8510404
Xinxin Yang, A. Vorobiev, K. Jeppson, J. Stake, L. Banszerus, C. Stampfer, M. Otto, D. Neumaier
Graphene field-effect transistors are promising for direct detection of THz signals at room temperature. The sensitivity of such detectors can be in part limited by the low-frequency noise. Here, we report on the characterization of the low-frequency noise of graphene field-effect transistor THz detectors in the frequency range from 1 Hz to 1 MHz. The room-temperature Hooge parameter is extracted to be around $2times 10^{-3}$. The voltage responsivity at room-temperature and the corresponding minimum noise equivalent power at 0.3 THz are estimated to be 11 V/W and 0.2 nW/Hzo.5, respectively, at a modulation frequency of 333 Hz, which shows comparable results with other detector technologies.
{"title":"Low-frequency Noise Characterization of Graphene FET THz Detectors","authors":"Xinxin Yang, A. Vorobiev, K. Jeppson, J. Stake, L. Banszerus, C. Stampfer, M. Otto, D. Neumaier","doi":"10.1109/IRMMW-THZ.2018.8510404","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510404","url":null,"abstract":"Graphene field-effect transistors are promising for direct detection of THz signals at room temperature. The sensitivity of such detectors can be in part limited by the low-frequency noise. Here, we report on the characterization of the low-frequency noise of graphene field-effect transistor THz detectors in the frequency range from 1 Hz to 1 MHz. The room-temperature Hooge parameter is extracted to be around $2times 10^{-3}$. The voltage responsivity at room-temperature and the corresponding minimum noise equivalent power at 0.3 THz are estimated to be 11 V/W and 0.2 nW/Hzo.5, respectively, at a modulation frequency of 333 Hz, which shows comparable results with other detector technologies.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"76 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":"80151350","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.2018.8509933
A. Kurayev, A. Rak, A. Badarin, S. Kurkin, A. Koronovskii, A. Hramov
The designs of BWT and TWT of a millimeter range with two wide tape electron beams are proposed and investigated. It is proposed to use a spirally bent rectangular waveguide on fundamental H10mode as an electrodynamic structure of the tubes. Unlike existing designs on wavy bent waveguides, the proposed schemes allow to significantly increase the current of electron optics, which improves significantly the output characteristics. Analytical estimates have shown the possibility of effective interaction of the electron beam with both direct and backward electromagnetic waves for the certain values of control parameters of the systems.
{"title":"Double-Beam Millimeter-Wave Band BWT and TWT on a Spirally Bent Rectangular Waveguide","authors":"A. Kurayev, A. Rak, A. Badarin, S. Kurkin, A. Koronovskii, A. Hramov","doi":"10.1109/IRMMW-THZ.2018.8509933","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8509933","url":null,"abstract":"The designs of BWT and TWT of a millimeter range with two wide tape electron beams are proposed and investigated. It is proposed to use a spirally bent rectangular waveguide on fundamental H10mode as an electrodynamic structure of the tubes. Unlike existing designs on wavy bent waveguides, the proposed schemes allow to significantly increase the current of electron optics, which improves significantly the output characteristics. Analytical estimates have shown the possibility of effective interaction of the electron beam with both direct and backward electromagnetic waves for the certain values of control parameters of the systems.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"171 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":"79419636","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.2018.8510313
Bo Zhang, Guo-cui Wang, Hongyu Ji, Bin Li, Jing-ling Shen
We investigate a high-efficiency broadband terahertz wave modulator with structures made from the conjugated polymer MEH - PPV, graphene, and Si, irradiated with an external excitation laser. We demonstrate a strategy that can alleviate the tradeoffbetween the requirements of modulation depth and modulation speed in polymer/silicon terahertz wave modulators. Using terahertz time-domain and continuous-wave systems, we measured both the terahertz transmission modulation properties and the time responses of the modulator structures. The conjugated polymer/graphene/silicon structure achieved a high modulation factor of93% for transmission as well as improved the modulation speed of the devices based on polymer/silicon. The high modulation efficiency of the polymer/graphene/silicon structure was induced by the enhancement in carrier density and the extremely high carrier mobility of graphene, respectively.
{"title":"Graphene based Organic Optical Terahertz Modulator","authors":"Bo Zhang, Guo-cui Wang, Hongyu Ji, Bin Li, Jing-ling Shen","doi":"10.1109/IRMMW-THZ.2018.8510313","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510313","url":null,"abstract":"We investigate a high-efficiency broadband terahertz wave modulator with structures made from the conjugated polymer MEH - PPV, graphene, and Si, irradiated with an external excitation laser. We demonstrate a strategy that can alleviate the tradeoffbetween the requirements of modulation depth and modulation speed in polymer/silicon terahertz wave modulators. Using terahertz time-domain and continuous-wave systems, we measured both the terahertz transmission modulation properties and the time responses of the modulator structures. The conjugated polymer/graphene/silicon structure achieved a high modulation factor of93% for transmission as well as improved the modulation speed of the devices based on polymer/silicon. The high modulation efficiency of the polymer/graphene/silicon structure was induced by the enhancement in carrier density and the extremely high carrier mobility of graphene, respectively.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"27 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":"84213474","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.2018.8510087
Ileana-Cristina Benca-Chclmus, F. F. Settembrini, G. Scalari, J. Faist
The non-destructive nature of electro-optic sampling is exploited to study the first order coherence function of modes oscillating inside a cold Fabry Perot cavity with sub-unity photon occupation number per mode, where the vacuum field contribution is similar to the thermal contribution. For this purpose, a fast electro-optic correlation setup has been implemented inside a cryogenic environment to suppress the thermal background. The Fabry-Perot cavity is constituted by the detection crystal itself.
{"title":"Field correlation measurements of photon modes with sub-unity photon occupation per mode inside a Fabry-Perot cavity","authors":"Ileana-Cristina Benca-Chclmus, F. F. Settembrini, G. Scalari, J. Faist","doi":"10.1109/IRMMW-THZ.2018.8510087","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510087","url":null,"abstract":"The non-destructive nature of electro-optic sampling is exploited to study the first order coherence function of modes oscillating inside a cold Fabry Perot cavity with sub-unity photon occupation number per mode, where the vacuum field contribution is similar to the thermal contribution. For this purpose, a fast electro-optic correlation setup has been implemented inside a cryogenic environment to suppress the thermal background. The Fabry-Perot cavity is constituted by the detection crystal itself.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"13 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":"85571869","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.2018.8510068
A. Rehn, Mikhail Mikerov, S. Preu, M. Koch, J. Balzer
We present a straightforward method for enhancing the performance of a low-cost THz-QTDS system regarding the bandwidth. The bandwidth of the THz signal is improved by modulation of the injection current of the laser diode. The rolloff of the THz spectrum is decreased by 55 dB/THz.
{"title":"Enhancement of THz-QTDS performance by pulsed laser operation","authors":"A. Rehn, Mikhail Mikerov, S. Preu, M. Koch, J. Balzer","doi":"10.1109/IRMMW-THZ.2018.8510068","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510068","url":null,"abstract":"We present a straightforward method for enhancing the performance of a low-cost THz-QTDS system regarding the bandwidth. The bandwidth of the THz signal is improved by modulation of the injection current of the laser diode. The rolloff of the THz spectrum is decreased by 55 dB/THz.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"18 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":"76777638","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.2018.8510108
W. He, C. Donaldson, L. Zhang, P. Cain, H. Yin, K. Ronald, A. Cross, A. Phelps
A W-band gyrotron traveling wave amplifier (gyro-TWA) based on a helically corrugated interaction region achieved an unsaturated output power of 3.4 kW with a gain of up to 37 dB and a 3 dB frequency bandwidth of at least 5.5 GHz. In the experiments it was found that the gyro- TWA can be operated with a range of different electron beams. Also the frequency agility of the gyro- TWA was demonstrated by the amplification of multi-frequency signals.
{"title":"Amplification of W-band multi-frequency signals using a gyro-TWA","authors":"W. He, C. Donaldson, L. Zhang, P. Cain, H. Yin, K. Ronald, A. Cross, A. Phelps","doi":"10.1109/IRMMW-THZ.2018.8510108","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510108","url":null,"abstract":"A W-band gyrotron traveling wave amplifier (gyro-TWA) based on a helically corrugated interaction region achieved an unsaturated output power of 3.4 kW with a gain of up to 37 dB and a 3 dB frequency bandwidth of at least 5.5 GHz. In the experiments it was found that the gyro- TWA can be operated with a range of different electron beams. Also the frequency agility of the gyro- TWA was demonstrated by the amplification of multi-frequency signals.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"659 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":"76842407","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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