Pub Date : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6104795
A. Baragwanath, M. Rosamond, A. Gallant, J. M. Chamberlain
A qualitative model describing the extraordinary optical transmission of THz radiation through periodic subwavelength two dimensional aperture arrays is presented. Extensive THz-TDS measurements support this model, where the combined effects of aperture shape, area, alignment and aspect ratio have been systematically investigated.
{"title":"Time-of-flight model for the extraordinary optical transmission through two dimensional aperture arrays","authors":"A. Baragwanath, M. Rosamond, A. Gallant, J. M. Chamberlain","doi":"10.1109/IRMMW-THZ.2011.6104795","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104795","url":null,"abstract":"A qualitative model describing the extraordinary optical transmission of THz radiation through periodic subwavelength two dimensional aperture arrays is presented. Extensive THz-TDS measurements support this model, where the combined effects of aperture shape, area, alignment and aspect ratio have been systematically investigated.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"88 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":"84197181","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.2011.6105056
S. Boppel, A. Lisauskas, D. Seliuta, L. Minkevičius, I. Kašalynas, G. Valušis, V. Krozer, H. Roskos
We report on the performance of silicon CMOS-transistor-based plasmonic THz detectors up to 4.25 THz. Room-temperature responsivity values of 1011 V/W at 584 GHz, 90 V/W at 3.125 THz and 11 V/W at 4.25 THz are reported. When cooled down to 20 K a maximum responsivity of 3.47 kV/W and a noise-equivalent power of 3 pW/√Hz are reached.
{"title":"Silicon CMOS-transistor-based detection up to 4.25 THz","authors":"S. Boppel, A. Lisauskas, D. Seliuta, L. Minkevičius, I. Kašalynas, G. Valušis, V. Krozer, H. Roskos","doi":"10.1109/IRMMW-THZ.2011.6105056","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105056","url":null,"abstract":"We report on the performance of silicon CMOS-transistor-based plasmonic THz detectors up to 4.25 THz. Room-temperature responsivity values of 1011 V/W at 584 GHz, 90 V/W at 3.125 THz and 11 V/W at 4.25 THz are reported. When cooled down to 20 K a maximum responsivity of 3.47 kV/W and a noise-equivalent power of 3 pW/√Hz are reached.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"11 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":"78109248","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.2011.6105113
Cunlin Zhang, Chao Deng
The near filed terahertz wave imaging technology has been applied in security screening for detecting objects concealed under clothes. This paper describes two terahertz wave imaging system that acquires the body image by opto-mechanical scanner. One system is worked at reflective mode. Another system is worked at transitive mode. Results show this system is promising for real security applications.
{"title":"Passive terahertz imager","authors":"Cunlin Zhang, Chao Deng","doi":"10.1109/IRMMW-THZ.2011.6105113","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105113","url":null,"abstract":"The near filed terahertz wave imaging technology has been applied in security screening for detecting objects concealed under clothes. This paper describes two terahertz wave imaging system that acquires the body image by opto-mechanical scanner. One system is worked at reflective mode. Another system is worked at transitive mode. Results show this system is promising for real security applications.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"57 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":"72830468","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.2011.6105193
S. B. Tombet, A. Satou, T. Otsuji, V. Ryzhii
We conduct time domain spectroscopy studies and shows that graphene sheet amplifies an incoming terahertz field. The graphene emission spectra dependency on laser pumping intensity shows a threshold like behavior, testifying the occurrence of the negative conductivity and the population inversion in the terahertz range, paving the way for a new class room temperature graphene based terahertz lasers.
{"title":"Stimulated terahertz emission from optically pumped graphene","authors":"S. B. Tombet, A. Satou, T. Otsuji, V. Ryzhii","doi":"10.1109/IRMMW-THZ.2011.6105193","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105193","url":null,"abstract":"We conduct time domain spectroscopy studies and shows that graphene sheet amplifies an incoming terahertz field. The graphene emission spectra dependency on laser pumping intensity shows a threshold like behavior, testifying the occurrence of the negative conductivity and the population inversion in the terahertz range, paving the way for a new class room temperature graphene based terahertz lasers.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"15 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":"73170945","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.2011.6105186
G. Gantenbein, H. Braune, G. Dammertz, V. Erckmann, S. Illy, S. Kern, W. Kasparek, C. Lechte, W. Leonhardt, C. Liévin, G. Michel, F. Noke, F. Purps, A. Samartsev, A. Schlaich, M. Schmid, M. Thumm
A 10 MW, 140 GHz ECRH system with a pulse duration of 30 minutes is currently under construction for the stellarator W7-X at Greifswald. The RF power will be provided by 10 gyrotrons. A European collaboration has been established to develop and build 9 (out of 10) tubes each with an output power of 1 MW for continuous wave (CW) operation. This contribution reports on recent progress with the series gyrotrons.
{"title":"Status of 1 MW, 140 GHz series gyrotrons for W7-X","authors":"G. Gantenbein, H. Braune, G. Dammertz, V. Erckmann, S. Illy, S. Kern, W. Kasparek, C. Lechte, W. Leonhardt, C. Liévin, G. Michel, F. Noke, F. Purps, A. Samartsev, A. Schlaich, M. Schmid, M. Thumm","doi":"10.1109/IRMMW-THZ.2011.6105186","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105186","url":null,"abstract":"A 10 MW, 140 GHz ECRH system with a pulse duration of 30 minutes is currently under construction for the stellarator W7-X at Greifswald. The RF power will be provided by 10 gyrotrons. A European collaboration has been established to develop and build 9 (out of 10) tubes each with an output power of 1 MW for continuous wave (CW) operation. This contribution reports on recent progress with the series gyrotrons.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"35 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":"81332464","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.2011.6105148
K. Iwaszczuk, A. Andryieuski, A. Lavrinenko, Xicheng Zhang, P. Jepsen
We present a new non-invasive air-photonic-based method of terahertz (THz) field imaging inside a parallel plate waveguide. The method is based on THz field-enhanced second harmonic generation of the fundamental laser beam in an external electric field. We also demonstrate the direct measurements of the frequency-dependent reflection coefficient at the end of the waveguide.
{"title":"Non-invasive method of field imaging in parallel plate waveguides","authors":"K. Iwaszczuk, A. Andryieuski, A. Lavrinenko, Xicheng Zhang, P. Jepsen","doi":"10.1109/IRMMW-THZ.2011.6105148","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105148","url":null,"abstract":"We present a new non-invasive air-photonic-based method of terahertz (THz) field imaging inside a parallel plate waveguide. The method is based on THz field-enhanced second harmonic generation of the fundamental laser beam in an external electric field. We also demonstrate the direct measurements of the frequency-dependent reflection coefficient at the end of the waveguide.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"16 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":"81682643","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.2011.6105019
B. Recur, A. Younus, S. Salort, P. Mounaix, B. Chassagne, P. Desbarats, J. Caumes, E. Abraham
Three different reconstruction methods have been compared for 3D terahertz computed tomography. The quality (intensity, contrast and geometric preservation) of reconstructed cross-sectional images has been discussed qualitatively and quantitatively together with the optimization of the number of projections.
{"title":"Reconstruction methods comparison for terahertz computed tomography","authors":"B. Recur, A. Younus, S. Salort, P. Mounaix, B. Chassagne, P. Desbarats, J. Caumes, E. Abraham","doi":"10.1109/IRMMW-THZ.2011.6105019","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105019","url":null,"abstract":"Three different reconstruction methods have been compared for 3D terahertz computed tomography. The quality (intensity, contrast and geometric preservation) of reconstructed cross-sectional images has been discussed qualitatively and quantitatively together with the optimization of the number of projections.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"12 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":"78949260","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.2011.6105086
O. Mitrofanov
THz near-field microscopy can make a large impact on development of THz technology. Sub-wavelength spatial resolution and the possibility of time-domain analysis make this method particularly useful in research on THz devices. Applications for device research, including mode analysis in waveguides and surface plasmon wave mapping will be discussed.
{"title":"THz near-field microscopy applications in device research","authors":"O. Mitrofanov","doi":"10.1109/IRMMW-THZ.2011.6105086","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105086","url":null,"abstract":"THz near-field microscopy can make a large impact on development of THz technology. Sub-wavelength spatial resolution and the possibility of time-domain analysis make this method particularly useful in research on THz devices. Applications for device research, including mode analysis in waveguides and surface plasmon wave mapping will be discussed.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"30 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":"76323140","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.2011.6104790
H. Fuser, R. Judaschke, M. Bieler
We perform high-precision frequency measurements in the THz spectral region using an unstabilized frequency comb, which acts as a transfer oscillator. To correct the beating signal resulting from the THz source and one comb line of the rectified optical comb for fluctuations of the laser repetition rate, a simple and flexible algorithm is used. By this, we achieve an accuracy of the measurement setup as high as 9·10−14 for a 100 GHz test source. This is an improvement of two orders of magnitude compared to previously reported precision measurements in this frequency range employing femtosecond lasers.
{"title":"High-precision THz spectrum analyzer based on an unstabilized frequency comb","authors":"H. Fuser, R. Judaschke, M. Bieler","doi":"10.1109/IRMMW-THZ.2011.6104790","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104790","url":null,"abstract":"We perform high-precision frequency measurements in the THz spectral region using an unstabilized frequency comb, which acts as a transfer oscillator. To correct the beating signal resulting from the THz source and one comb line of the rectified optical comb for fluctuations of the laser repetition rate, a simple and flexible algorithm is used. By this, we achieve an accuracy of the measurement setup as high as 9·10−14 for a 100 GHz test source. This is an improvement of two orders of magnitude compared to previously reported precision measurements in this frequency range employing femtosecond lasers.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"89 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":"76438826","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.2011.6105032
M. Sattorov, G. Park, K. Lukin, M. Mil'cho
The electron beam interaction with the radio-frequency field (RF) close to the surface of the slow-wave structure of W-band Clinotron is studied by numerical simulations with regard to the real RF field distribution, for the inclined electron beam to the periodical slow-wave structure under small angle α. It is demonstrated that the electron interaction with the transversal electrical field induces the selective settling of the electrons on the grating lamellas, and the power is then taken away from the modulated electron beam in the grating slot resonators.
{"title":"Beam-wave interaction in 0.1 THz Clinotron","authors":"M. Sattorov, G. Park, K. Lukin, M. Mil'cho","doi":"10.1109/IRMMW-THZ.2011.6105032","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105032","url":null,"abstract":"The electron beam interaction with the radio-frequency field (RF) close to the surface of the slow-wave structure of W-band Clinotron is studied by numerical simulations with regard to the real RF field distribution, for the inclined electron beam to the periodical slow-wave structure under small angle α. It is demonstrated that the electron interaction with the transversal electrical field induces the selective settling of the electrons on the grating lamellas, and the power is then taken away from the modulated electron beam in the grating slot resonators.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"80 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":"76183932","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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