Pub Date : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6105074
I. Konoplev, A. Phipps, A. MacLachlan, A. Cross, C. Robertson, A. Young, A. Phelps
The design of an experiment to study a two-dimensional (2D) cylindrical lattice is presented. We illustrate the mode transformations inside the set-up and discuss planned experiments with the lattice. Investigations of a W-band periodic surface lattice are reported. This lattice is intended for use in a novel W-band surface field Cherenkov maser.
{"title":"W-band two-dimensional periodic surface lattice for a surface field Cherenkov maser","authors":"I. Konoplev, A. Phipps, A. MacLachlan, A. Cross, C. Robertson, A. Young, A. Phelps","doi":"10.1109/IRMMW-THZ.2011.6105074","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105074","url":null,"abstract":"The design of an experiment to study a two-dimensional (2D) cylindrical lattice is presented. We illustrate the mode transformations inside the set-up and discuss planned experiments with the lattice. Investigations of a W-band periodic surface lattice are reported. This lattice is intended for use in a novel W-band surface field Cherenkov maser.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"14 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":"91204133","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.2011.6104798
John Yan, L. Barnett, C. Domier, N. Luhmann
Overmoded waveguide rectangular-to-circular mode converters are investigated for quasi-optical high power electron device applications. Excellent mode purity is predicted along with good radiation pattern at the output of the antenna.
{"title":"Investigation of overmoded waveguide mode converter for quasi-optical W-band sheet beam Klystron","authors":"John Yan, L. Barnett, C. Domier, N. Luhmann","doi":"10.1109/IRMMW-THZ.2011.6104798","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104798","url":null,"abstract":"Overmoded waveguide rectangular-to-circular mode converters are investigated for quasi-optical high power electron device applications. Excellent mode purity is predicted along with good radiation pattern at the output of the antenna.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"81 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":"73151033","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.2011.6104778
H. Tanvir, B. Rahman, K. Grattan
Degeneration of the lasing mode in a Terahertz Quantum Cascade Laser due to interaction with parasitic ghost modes is demonstrated here through rigorous numerical analysis. We show that such interactions can adversely affect the performance of a QCL by causing abrupt rises in lasing threshold. We also show that such affects can be avoided by altering the width of the metal cladding layer.
{"title":"Ghost modes in Terahertz Quantum Cascade Laser waveguides","authors":"H. Tanvir, B. Rahman, K. Grattan","doi":"10.1109/IRMMW-THZ.2011.6104778","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104778","url":null,"abstract":"Degeneration of the lasing mode in a Terahertz Quantum Cascade Laser due to interaction with parasitic ghost modes is demonstrated here through rigorous numerical analysis. We show that such interactions can adversely affect the performance of a QCL by causing abrupt rises in lasing threshold. We also show that such affects can be avoided by altering the width of the metal cladding layer.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"203 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":"73759882","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.2011.6104772
B. McElmurry, L. Rivera-Rivera, K. W. Scott, R. Lucchese, Zhongcheng Wang, I. Leonov, A. Legon, J. Bevan
Application of a QCL based spectrometer to cw supersonic slit jet expansions of CO and HX (X= F, Cl, CN, CCH) are reported. Spectroscopic analysis of fundamental, combination and hot bands of the CO stretching vibrations provide ro-vibrational parameters for low frequency intermolecular vibrations that can be incorporated in determination of morphed potentials for the respective dimers.
{"title":"Infrared quantum cascade laser spectroscopy of low frequency vibrations of intermolecular complexes","authors":"B. McElmurry, L. Rivera-Rivera, K. W. Scott, R. Lucchese, Zhongcheng Wang, I. Leonov, A. Legon, J. Bevan","doi":"10.1109/IRMMW-THZ.2011.6104772","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104772","url":null,"abstract":"Application of a QCL based spectrometer to cw supersonic slit jet expansions of CO and HX (X= F, Cl, CN, CCH) are reported. Spectroscopic analysis of fundamental, combination and hot bands of the CO stretching vibrations provide ro-vibrational parameters for low frequency intermolecular vibrations that can be incorporated in determination of morphed potentials for the respective dimers.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"646 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":"74737880","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.2011.6105177
M. Vitiello, J. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, J. Harrington, H. Beere, D. Ritchie
We demonstrate that azimuthally polarized micro-ring THz quantum-cascade lasers can be coupled to hollow metallic waveguides with efficiencies ≥96% and perfectly matched with the TE01 waveguide mode, giving attenuation losses < 3dB/m. The use of Ag coated-flexible pipe waveguides allows propagation of either vertically polarized or azimuthally polarized QCL beams with propagation losses as low as 2.1–4.4 dB/m and bending losses lower than 1.2 dB.
{"title":"Guiding a terahertz quantum cascade laser into low-loss hollow waveguides","authors":"M. Vitiello, J. Xu, F. Beltram, A. Tredicucci, O. Mitrofanov, J. Harrington, H. Beere, D. Ritchie","doi":"10.1109/IRMMW-THZ.2011.6105177","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105177","url":null,"abstract":"We demonstrate that azimuthally polarized micro-ring THz quantum-cascade lasers can be coupled to hollow metallic waveguides with efficiencies ≥96% and perfectly matched with the TE01 waveguide mode, giving attenuation losses < 3dB/m. The use of Ag coated-flexible pipe waveguides allows propagation of either vertically polarized or azimuthally polarized QCL beams with propagation losses as low as 2.1–4.4 dB/m and bending losses lower than 1.2 dB.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"677 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":"74753771","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.2011.6105124
A. Berenguer, M. Baquero-Escudero, D. Sánchez-Escuderos, M. Ferrando-Bataller
Recently, several waveguides have been proposed for THz waveguiding. The single metal wire waveguide is one of the most promising due its low-loss and non-dispersive behavior. However, waves are very weakly guided by this waveguide. This paper analyzes the effect on power confinement, attenuation and dispersion, of coating the wire with a dielectric jacket, depending on its thickness and permittivity.
{"title":"Study of the effect of coating the single wire waveguide with a dielectric","authors":"A. Berenguer, M. Baquero-Escudero, D. Sánchez-Escuderos, M. Ferrando-Bataller","doi":"10.1109/IRMMW-THZ.2011.6105124","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105124","url":null,"abstract":"Recently, several waveguides have been proposed for THz waveguiding. The single metal wire waveguide is one of the most promising due its low-loss and non-dispersive behavior. However, waves are very weakly guided by this waveguide. This paper analyzes the effect on power confinement, attenuation and dispersion, of coating the wire with a dielectric jacket, depending on its thickness and permittivity.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"51 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":"74989752","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.2011.6105022
M. Vlasenko, V. Pickalov, D. G. Rodionov, B. Knyazev
Numerical simulation and real experiments of obtaining tomographic projections were performed, and iterative algorithms for diffraction and transmission tomography for image reconstruction were developed. The generalization of one of the most promising type of iterative algorithms — Gerchberg-Papoulis algorithm for diffraction tomography was constucted. In addition, experimental methods for registration of tomographic projections in the terahertz range were developed. All measurements were carried out using real-time image sensor: a luminescence-quenching thermal image plate with an intensified CCD camera.
{"title":"Tomography using a high-power terahertz free electron laser","authors":"M. Vlasenko, V. Pickalov, D. G. Rodionov, B. Knyazev","doi":"10.1109/IRMMW-THZ.2011.6105022","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105022","url":null,"abstract":"Numerical simulation and real experiments of obtaining tomographic projections were performed, and iterative algorithms for diffraction and transmission tomography for image reconstruction were developed. The generalization of one of the most promising type of iterative algorithms — Gerchberg-Papoulis algorithm for diffraction tomography was constucted. In addition, experimental methods for registration of tomographic projections in the terahertz range were developed. All measurements were carried out using real-time image sensor: a luminescence-quenching thermal image plate with an intensified CCD camera.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"67 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":"74952077","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.2011.6105195
K. Nogajewski, K. Karpierz, M. Grynberg, W. Knap, R. Gaska, J. Yang, M. Shur, J. Lusakowski
We report on experimental observation and theoretical analysis of magnetic-field and gate-voltage tunable magnetoplasmon resonances in grating-gate GaN/AlGaN-based field-effect transistors suitable for detection of THz radiation.
{"title":"Magnetooptical studies of resonant plasma excitations in grating-gate GaN/AlGaN-based field-effect transistors","authors":"K. Nogajewski, K. Karpierz, M. Grynberg, W. Knap, R. Gaska, J. Yang, M. Shur, J. Lusakowski","doi":"10.1109/IRMMW-THZ.2011.6105195","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105195","url":null,"abstract":"We report on experimental observation and theoretical analysis of magnetic-field and gate-voltage tunable magnetoplasmon resonances in grating-gate GaN/AlGaN-based field-effect transistors suitable for detection of THz radiation.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"19 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":"75140030","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.2011.6104984
V. Révéret, L. Rodriguez, P. Agnèse
The sensitivity specifications for next generation submillimeter instruments for astronomy, astrophysics and cosmology are between 1 and 2 orders of magnitude better than state of the art instruments like Herschel PACS. We are studying new solutions using semiconducting bolometers in order to achieve the required performances. We show that with minimum changes compared to our existing technology, we obtain very good performances with detectors that are very similar to the ones used for PACS. We also show our plans to go beyond these values.
{"title":"Solutions for high sensitivity direct detection in submillimeter astronomy","authors":"V. Révéret, L. Rodriguez, P. Agnèse","doi":"10.1109/IRMMW-THZ.2011.6104984","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104984","url":null,"abstract":"The sensitivity specifications for next generation submillimeter instruments for astronomy, astrophysics and cosmology are between 1 and 2 orders of magnitude better than state of the art instruments like Herschel PACS. We are studying new solutions using semiconducting bolometers in order to achieve the required performances. We show that with minimum changes compared to our existing technology, we obtain very good performances with detectors that are very similar to the ones used for PACS. We also show our plans to go beyond these values.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"279 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":"77293797","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.2011.6105185
H. L. Mosbacker, J. Alverbro, Ze Zhang, P. Fay, Yang Ni, P. Potet, K. Sertel, G. Trichopoulos, K. Topalli, J. Volakis, D. Burdette
The widespread adoption of THz based applications has been hindered by the lack of a real-time, broad-band, cost-effective THz camera with sufficient sensitivity to enable applications in markets as diverse as security, non-destructive evaluation, and biomedical imaging. This technological gap can be filled through the development of an 80 × 64 pixel array of Sb-heterostructure backward diodes (Sb-HBDs) monolithically integrated to broadband (600 GHz–1200 GHz) antennas that can be directly flip-chipped to a CMOS voltage-mode readout integrated circuit (ROIC). This paper outlines the current progress of the prototype device.
{"title":"Initial test results for a real-time, 80 × 64 pixel, 600 GHz–1.2 THz imager","authors":"H. L. Mosbacker, J. Alverbro, Ze Zhang, P. Fay, Yang Ni, P. Potet, K. Sertel, G. Trichopoulos, K. Topalli, J. Volakis, D. Burdette","doi":"10.1109/IRMMW-THZ.2011.6105185","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105185","url":null,"abstract":"The widespread adoption of THz based applications has been hindered by the lack of a real-time, broad-band, cost-effective THz camera with sufficient sensitivity to enable applications in markets as diverse as security, non-destructive evaluation, and biomedical imaging. This technological gap can be filled through the development of an 80 × 64 pixel array of Sb-heterostructure backward diodes (Sb-HBDs) monolithically integrated to broadband (600 GHz–1200 GHz) antennas that can be directly flip-chipped to a CMOS voltage-mode readout integrated circuit (ROIC). This paper outlines the current progress of the prototype device.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"30 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":"77074701","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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