Pub Date : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6104752
J. Faist, G. Scalari, M. Fischer, M. Beck
Ten years after its first demonstration in the Terahertz, quantum cascade laser technology has made significant strides towards becoming a relevant device for real-world applications. A better understanding of the loss mechanism due to the injection process as well as the development of new materials such as the InGaAs/InGaSb/InP hold great promises for improving the maximum operating temperature of these devices.
{"title":"Terahertz quantum cascade lasers: 10 years of active region and material progresses","authors":"J. Faist, G. Scalari, M. Fischer, M. Beck","doi":"10.1109/IRMMW-THZ.2011.6104752","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104752","url":null,"abstract":"Ten years after its first demonstration in the Terahertz, quantum cascade laser technology has made significant strides towards becoming a relevant device for real-world applications. A better understanding of the loss mechanism due to the injection process as well as the development of new materials such as the InGaAs/InGaSb/InP hold great promises for improving the maximum operating temperature of these devices.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"38 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":"77648549","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.2011.6104816
V. Vaks, S. Pripolsin, A. Panin, B. McElmurry, J. Bevan, S. Belov, I. Leonov, D. W. van der Weide, E. Grossman
Design and testing of a THz sensor ultimately to be capable of operating from 0.068 to 8.1 THz are presented. Results for modular approaches in the mm and submm spectral regions are reported utilizing cavity-enhanced techniques. Investigations indicate ppq levels of detection for molecular species with 1.0 Debyes dipole moment.
{"title":"Towards sub ppq detection and monitoring capabilities for environmental applications using novel THz technologies","authors":"V. Vaks, S. Pripolsin, A. Panin, B. McElmurry, J. Bevan, S. Belov, I. Leonov, D. W. van der Weide, E. Grossman","doi":"10.1109/IRMMW-THZ.2011.6104816","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104816","url":null,"abstract":"Design and testing of a THz sensor ultimately to be capable of operating from 0.068 to 8.1 THz are presented. Results for modular approaches in the mm and submm spectral regions are reported utilizing cavity-enhanced techniques. Investigations indicate ppq levels of detection for molecular species with 1.0 Debyes dipole moment.","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":"77871684","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.2011.6105123
O. Kwon, S. Pak, J. So, In-Keun Baik, Sun-Hong Min, G. Park
Utilizing high power CW THz Coupled Cavity BWO (CCBWO), over 108 of Signal to Noise Ratio (SNR) is obtained. Extreme subwavelength apertures are perforated on ultrathin aluminum films by micro-photo-etching and It is proved that the transmittance normalized to hole size is proportional to 4th power of the ratio between hole size to incident wavelength for a<<λ as Bethe's expectation.
{"title":"Experimental confirmation of Bethe's diffraction theory","authors":"O. Kwon, S. Pak, J. So, In-Keun Baik, Sun-Hong Min, G. Park","doi":"10.1109/IRMMW-THZ.2011.6105123","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105123","url":null,"abstract":"Utilizing high power CW THz Coupled Cavity BWO (CCBWO), over 108 of Signal to Noise Ratio (SNR) is obtained. Extreme subwavelength apertures are perforated on ultrathin aluminum films by micro-photo-etching and It is proved that the transmittance normalized to hole size is proportional to 4th power of the ratio between hole size to incident wavelength for a<<λ as Bethe's expectation.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"55 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":"76649796","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.2011.6104761
Jinfeng Zhao, D. Gamzina, A. Baig, L. Barnett, Jian-xun Wang, N. Luhmann
Nanocomposite Sc2O3-added tungsten dispenser cathodes were tested in Cathode Life Test Vehicles (CLTV) with a Pierce gun configuration under CW mode. The emission performance for both dc and pulsed current density remained consistent. In CLTV #1, owing to perveance issue (there is 100 micron gap between focus electrode and cathode emission surface), 10 A/cm2 dc current density can be acquired at practical temperature of 1120°C Br for more than 2000 hours. In CLTV #2 with reduced FE gap, 45 A/cm2 dc current density is obtained.
{"title":"Scandate dispenser cathode for 220 GHz 50W sheet beam travelling wave tube amplifier","authors":"Jinfeng Zhao, D. Gamzina, A. Baig, L. Barnett, Jian-xun Wang, N. Luhmann","doi":"10.1109/IRMMW-THZ.2011.6104761","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104761","url":null,"abstract":"Nanocomposite Sc2O3-added tungsten dispenser cathodes were tested in Cathode Life Test Vehicles (CLTV) with a Pierce gun configuration under CW mode. The emission performance for both dc and pulsed current density remained consistent. In CLTV #1, owing to perveance issue (there is 100 micron gap between focus electrode and cathode emission surface), 10 A/cm2 dc current density can be acquired at practical temperature of 1120°C Br for more than 2000 hours. In CLTV #2 with reduced FE gap, 45 A/cm2 dc current density is obtained.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"138 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":"80107049","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.2011.6105139
M. R. Hashemi, B. Williams, T. Itoh
This paper reviews progress of development and applications of the leaky wave antennas (LWA) based on the transmission line metamaterial over the past several years.
本文综述了近年来基于传输线超材料的漏波天线的发展和应用进展。
{"title":"Leaky wave antennas based on transmission line metamaterials","authors":"M. R. Hashemi, B. Williams, T. Itoh","doi":"10.1109/IRMMW-THZ.2011.6105139","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105139","url":null,"abstract":"This paper reviews progress of development and applications of the leaky wave antennas (LWA) based on the transmission line metamaterial over the past several years.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"54 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":"75767387","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.2011.6104789
J. Melinger, Yihong Yang, Mahboubeh Mandeghar, Alisha J. Shutler, D. Grischkowsky
We describe the initial phase of a long path terahertz time-domain spectroscopy apparatus to detect THz rotational spectra of small vapor phase molecules within the atmospheric transparency windows. We discuss the measurements first for a relatively short path THz propagation path of 6.2 meters, and then for a much longer path of 170 meters.
{"title":"THz detection of small molecule vapors over long paths in the atmospheric transmission windows","authors":"J. Melinger, Yihong Yang, Mahboubeh Mandeghar, Alisha J. Shutler, D. Grischkowsky","doi":"10.1109/IRMMW-THZ.2011.6104789","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104789","url":null,"abstract":"We describe the initial phase of a long path terahertz time-domain spectroscopy apparatus to detect THz rotational spectra of small vapor phase molecules within the atmospheric transparency windows. We discuss the measurements first for a relatively short path THz propagation path of 6.2 meters, and then for a much longer path of 170 meters.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"8 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":"82457237","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.2011.6104963
R. Logan, J. R. Demers, B. Kasper
We report on the development of a portable, battery-operated terahertz spectrometer designed for reflection-mode or transmission-mode studies of materials in a wide range of applications. We also discuss novel optical THz phase-control methods employed in the system.
{"title":"Field-portable THz spectrometer for characterization of explosives and chemicals","authors":"R. Logan, J. R. Demers, B. Kasper","doi":"10.1109/IRMMW-THZ.2011.6104963","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104963","url":null,"abstract":"We report on the development of a portable, battery-operated terahertz spectrometer designed for reflection-mode or transmission-mode studies of materials in a wide range of applications. We also discuss novel optical THz phase-control methods employed in the system.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"16 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":"83066155","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.2011.6105115
D. Phillips, Elizabeth A. Tanner, H. Everitt, F. D. De Lucia
IR/THz double resonance spectroscopy has recently been proposed as a method of chemical remote sensing with isotopic molecular recognition specificity at atmospheric pressures for distances approaching one kilometer.[1] Double resonance signatures are calculated, from which the sensitivity and hardware requirements for a double resonance remote sensing spectrometer may be estimated. The extension of this technique to heavier and more complex molecules is discussed.
{"title":"Infrared/terahertz double resonance spectroscopy remote sensing","authors":"D. Phillips, Elizabeth A. Tanner, H. Everitt, F. D. De Lucia","doi":"10.1109/IRMMW-THZ.2011.6105115","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105115","url":null,"abstract":"IR/THz double resonance spectroscopy has recently been proposed as a method of chemical remote sensing with isotopic molecular recognition specificity at atmospheric pressures for distances approaching one kilometer.[1] Double resonance signatures are calculated, from which the sensitivity and hardware requirements for a double resonance remote sensing spectrometer may be estimated. The extension of this technique to heavier and more complex molecules is discussed.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"288 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":"83136652","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.2011.6105015
T. Hattori
A theoretical framework for the description of two-dimensional nonlinear terahertz time-domain spectroscopy has been developed based on weakly nonlinear classical oscillators. Obtained 2D spectra show rich information of the system such as order and origin of nonlinearity, inhomogeneity, and nonlinear mode coupling as well as the dynamics.
{"title":"Two-dimensional terahertz time-domain spectroscopy of classical oscillators","authors":"T. Hattori","doi":"10.1109/IRMMW-THZ.2011.6105015","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105015","url":null,"abstract":"A theoretical framework for the description of two-dimensional nonlinear terahertz time-domain spectroscopy has been developed based on weakly nonlinear classical oscillators. Obtained 2D spectra show rich information of the system such as order and origin of nonlinearity, inhomogeneity, and nonlinear mode coupling as well as the dynamics.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"7 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":"80179299","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.2011.6105218
M. Kirley, Benjamin B. Yang, K. Willis, Marcus J. Weber, N. Sule, S. Hagness, I. Knezevic, J. Booske
The conductivity of doped silicon is measured at 400 and 650 GHz. Measurements are performed using a high quality factor, semi-confocal resonant cavity. Data is presented which contradicts conventional theory (Drude model) and in agreement with a multiphysics computational model being developed at UW-Madison.
{"title":"Measurements of near terahertz conductivity of doped silicon using a high quality factor resonant cavity","authors":"M. Kirley, Benjamin B. Yang, K. Willis, Marcus J. Weber, N. Sule, S. Hagness, I. Knezevic, J. Booske","doi":"10.1109/IRMMW-THZ.2011.6105218","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105218","url":null,"abstract":"The conductivity of doped silicon is measured at 400 and 650 GHz. Measurements are performed using a high quality factor, semi-confocal resonant cavity. Data is presented which contradicts conventional theory (Drude model) and in agreement with a multiphysics computational model being developed at UW-Madison.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"35 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":"81899402","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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