Pub Date : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6104844
J. Jackson, J. Labaune, G. Mourou, L. d’Alessandro, A. Whyte, M. Menu
Terahertz pulsed imaging was used to study corroded copper alloy historical artifacts in transmission and reflection. The stratified layers were investigated and regions of total mineralization were identified.
采用太赫兹脉冲成像技术研究了铜合金历史文物的透射和反射特性。研究了层状层，确定了总矿化区。
{"title":"Pulsed terahertz investigation of corroded and mineralized copper alloy historical artifacts","authors":"J. Jackson, J. Labaune, G. Mourou, L. d’Alessandro, A. Whyte, M. Menu","doi":"10.1109/IRMMW-THZ.2011.6104844","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104844","url":null,"abstract":"Terahertz pulsed imaging was used to study corroded copper alloy historical artifacts in transmission and reflection. The stratified layers were investigated and regions of total mineralization were identified.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75269233","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.2011.6105068
M. Hoefle, M. Koeberle, A. Penirschke, R. Jakoby
An improved phase tunable millimeter wave Vivaldi antenna array element is presented in this paper. The liquid crystal phase shifter provides the individual phase and can be integrated in an wideband array configuration for electronic beam steering. The applied high performance LC GT3–23001 offers a 2.5 times higher differential phase shift than K15 (5CB).
{"title":"Improved millimeter wave Vivaldi antenna array element with high performance liquid crystals","authors":"M. Hoefle, M. Koeberle, A. Penirschke, R. Jakoby","doi":"10.1109/IRMMW-THZ.2011.6105068","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105068","url":null,"abstract":"An improved phase tunable millimeter wave Vivaldi antenna array element is presented in this paper. The liquid crystal phase shifter provides the individual phase and can be integrated in an wideband array configuration for electronic beam steering. The applied high performance LC GT3–23001 offers a 2.5 times higher differential phase shift than K15 (5CB).","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75883474","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.2011.6105092
Y. Yamaguchi, N. Yamada, Y. Tatematsu, T. Saito, R. Ikeda, J. Mudiganti, I. Ogawa, T. Idehara
A 300 GHz pulsed gyrotron with a power exceeding 100 kW has been under development. This paper describes the design optimization of a magnetron injection gun for this gyrotron. An optimum geometry of the electrodes is investigated to provide a laminar electron flow with a small velocity spread.
{"title":"Design of MIG for 300 GHz high-power pulsed gyrotron","authors":"Y. Yamaguchi, N. Yamada, Y. Tatematsu, T. Saito, R. Ikeda, J. Mudiganti, I. Ogawa, T. Idehara","doi":"10.1109/IRMMW-THZ.2011.6105092","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105092","url":null,"abstract":"A 300 GHz pulsed gyrotron with a power exceeding 100 kW has been under development. This paper describes the design optimization of a magnetron injection gun for this gyrotron. An optimum geometry of the electrodes is investigated to provide a laminar electron flow with a small velocity spread.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74423589","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.2011.6104834
N. Chen, Tsun-Hsu Chang
This paper investigates the characteristics of coaxial waveguide modes in variation to the cross-section geometry and proposes the solutions for broadband and high-purity conversions of lossless coaxial TE01 mode at low terahertz-wave regime. Four-wave, eight-wave, and sixteen-wave rectangular waveguide power dividers/combiners are developed to excite the desired coaxial TE01 mode but to suppress the potential parasitic TE21, TE41, and TE81 oscillations at radius ratios 4.05, 1.64, and 1.36, respectively. Accordingly, the simulated results reveal the broad −1dB back-to-back transmission bandwidth of 13.5 GHz (14.3%), 12.7GHz (13.5%), and 18.7 GHz (19.9%) at W-band. Notably, these three converters with different cross-sections are designed to be capable of concentric integration, which yields a three-channel (3C) high power rotary joint for long-range and high-resolution radar applications.
{"title":"Investigation of coaxial TE01 mode converter from high to low radius ratio structures","authors":"N. Chen, Tsun-Hsu Chang","doi":"10.1109/IRMMW-THZ.2011.6104834","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104834","url":null,"abstract":"This paper investigates the characteristics of coaxial waveguide modes in variation to the cross-section geometry and proposes the solutions for broadband and high-purity conversions of lossless coaxial TE01 mode at low terahertz-wave regime. Four-wave, eight-wave, and sixteen-wave rectangular waveguide power dividers/combiners are developed to excite the desired coaxial TE01 mode but to suppress the potential parasitic TE21, TE41, and TE81 oscillations at radius ratios 4.05, 1.64, and 1.36, respectively. Accordingly, the simulated results reveal the broad −1dB back-to-back transmission bandwidth of 13.5 GHz (14.3%), 12.7GHz (13.5%), and 18.7 GHz (19.9%) at W-band. Notably, these three converters with different cross-sections are designed to be capable of concentric integration, which yields a three-channel (3C) high power rotary joint for long-range and high-resolution radar applications.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74604434","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.2011.6105079
A. Serdyukov, A. Hoehl, A. Matschulat, R. Muller, G. Ulm, U. Schade, A. Bawagan
We report the status of the electron storage ring Metrology Light Source (MLS) as a source of powerful, stable, and pulsed THz radiation. As an example we show first results from water measurements in the THz spectral range at the THz beamline of the MLS.
{"title":"THz activities at the Metrology Light Source","authors":"A. Serdyukov, A. Hoehl, A. Matschulat, R. Muller, G. Ulm, U. Schade, A. Bawagan","doi":"10.1109/IRMMW-THZ.2011.6105079","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105079","url":null,"abstract":"We report the status of the electron storage ring Metrology Light Source (MLS) as a source of powerful, stable, and pulsed THz radiation. As an example we show first results from water measurements in the THz spectral range at the THz beamline of the MLS.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73008800","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.2011.6105100
W. Fu, Yang Yan, Diwei Liu, Xuesong Yuan, Shenggang Liu
One of the urgent problems in gyrotron development is to improve the operation frequency. In this paper, we investigate the possibilities of coaxial gyrotron with two beams (CGTB) operation at high harmonic. The results show that CGTB has potential advantages to operate at high harmonic.
{"title":"Possibilities and advantages of coaxial gyrotron with two beams operation at high harmonic","authors":"W. Fu, Yang Yan, Diwei Liu, Xuesong Yuan, Shenggang Liu","doi":"10.1109/IRMMW-THZ.2011.6105100","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105100","url":null,"abstract":"One of the urgent problems in gyrotron development is to improve the operation frequency. In this paper, we investigate the possibilities of coaxial gyrotron with two beams (CGTB) operation at high harmonic. The results show that CGTB has potential advantages to operate at high harmonic.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73974776","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.2011.6105005
G. Sharma, H. Hafez, I. Al-Naib, R. Morandotti, T. Ozaki
We investigate the effects of electron carrier density on the nonlinear response of photoexcited GaAs, illuminated by intense terahertz fields. We use the optical-pump/THz-probe technique, and explain our experimental results with an intervalley-scattering-based model.
{"title":"Effects of the carrier density on the THz-induced nonlinearity in photoexcited GaAs","authors":"G. Sharma, H. Hafez, I. Al-Naib, R. Morandotti, T. Ozaki","doi":"10.1109/IRMMW-THZ.2011.6105005","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105005","url":null,"abstract":"We investigate the effects of electron carrier density on the nonlinear response of photoexcited GaAs, illuminated by intense terahertz fields. We use the optical-pump/THz-probe technique, and explain our experimental results with an intervalley-scattering-based model.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75893255","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.2011.6104870
A. Andrianov, A. Aleshin, A. Bobylev
We report on electrical and optical properties of the 1 μm thick films of conjugated polymer poly[9,9-bis-(2-ethylhexyl)-9H-fluorene-2,7-diyl] (PFO) studied by terahertz (THz) spectroscopy. The spectra of characteristics of PFO films in the 0.2–3.0 THz frequency range can be well described by Lorentz oscillator model.
{"title":"Terahertz time-domain spectroscopy of polyfluorene thin films","authors":"A. Andrianov, A. Aleshin, A. Bobylev","doi":"10.1109/IRMMW-THZ.2011.6104870","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104870","url":null,"abstract":"We report on electrical and optical properties of the 1 μm thick films of conjugated polymer poly[9,9-bis-(2-ethylhexyl)-9H-fluorene-2,7-diyl] (PFO) studied by terahertz (THz) spectroscopy. The spectra of characteristics of PFO films in the 0.2–3.0 THz frequency range can be well described by Lorentz oscillator model.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75893787","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.2011.6104792
H. R. Park, Y. Bahk, J. Bravo-Abad, Q. Park, K. Ahn, F. García-Vidal, D. Kim
We show that sub-skin depth nanoscale barriers separating two vertically aligned slot antennas can strongly modulate their resonance features. Our findings have fundamental implications for the sensitive nano-particle detections using long wavelength light.
{"title":"Strong coupling between terahertz nano slot antennas separated by sub-skin depth barriers","authors":"H. R. Park, Y. Bahk, J. Bravo-Abad, Q. Park, K. Ahn, F. García-Vidal, D. Kim","doi":"10.1109/IRMMW-THZ.2011.6104792","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104792","url":null,"abstract":"We show that sub-skin depth nanoscale barriers separating two vertically aligned slot antennas can strongly modulate their resonance features. Our findings have fundamental implications for the sensitive nano-particle detections using long wavelength light.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75894079","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.2011.6105033
A. Doria, G. Gallerano, E. Giovenale, G. Messina, I. Spassovsky
An electron based radiation source is presented with the aim of irradiating cell membrane models and biological cell membranes. The peculiarity of the device is that it can simultaneously generate short electromagnetic pulses, in the millimeter wave range, and electrostatic pulses with the same time structure.
{"title":"Electromagnetic pulser for the investigation of cell membranes","authors":"A. Doria, G. Gallerano, E. Giovenale, G. Messina, I. Spassovsky","doi":"10.1109/IRMMW-THZ.2011.6105033","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105033","url":null,"abstract":"An electron based radiation source is presented with the aim of irradiating cell membrane models and biological cell membranes. The peculiarity of the device is that it can simultaneously generate short electromagnetic pulses, in the millimeter wave range, and electrostatic pulses with the same time structure.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2011-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76505927","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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