Pub Date : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6104950
J. K. Choi, K. Wang, R. Ramaswamy, C. Deutsch, A. Muraviev, G. Strasser, A. Sergeev, V. Mitin
Recently proposed detectors based on disordered semiconductor heterostructures are well coupled to THz radiation and require substantially less power of the local oscillator (LO) than the widely used Schottky diodes. Integration of these detectors with Quantum Cascade Lasers (QCLs) for THz heterodyne sensing is very promising for numerous applications of THz spectroscopy. In this work, we have fabricated and characterized THz QCLs grown on GaAs/AlGaAs superlattice based on LO-phonon depopulation mechanism. The designed QCLs operate with a stable continuous-wave single-mode operation in the range of 2–3 THz and the effective line-width is in MHz scale. The peak power in the designed QCLs is estimated to be ∼30 μW at 77K and ∼ 0.3 mW at 4K. Manageable spectral characteristics have been achieved using selective devices and by varying the applied bias.
{"title":"Quantum Cascade Lasers for semiconductor heterodyne receiver","authors":"J. K. Choi, K. Wang, R. Ramaswamy, C. Deutsch, A. Muraviev, G. Strasser, A. Sergeev, V. Mitin","doi":"10.1109/IRMMW-THZ.2011.6104950","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104950","url":null,"abstract":"Recently proposed detectors based on disordered semiconductor heterostructures are well coupled to THz radiation and require substantially less power of the local oscillator (LO) than the widely used Schottky diodes. Integration of these detectors with Quantum Cascade Lasers (QCLs) for THz heterodyne sensing is very promising for numerous applications of THz spectroscopy. In this work, we have fabricated and characterized THz QCLs grown on GaAs/AlGaAs superlattice based on LO-phonon depopulation mechanism. The designed QCLs operate with a stable continuous-wave single-mode operation in the range of 2–3 THz and the effective line-width is in MHz scale. The peak power in the designed QCLs is estimated to be ∼30 μW at 77K and ∼ 0.3 mW at 4K. Manageable spectral characteristics have been achieved using selective devices and by varying the applied bias.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"47 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":"77347736","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.2011.6104826
T. Nose, Takashi Seno, Ryohei Yuri, R. Ito, M. Honma
Quasi optic approach for liquid crystal device application is investigated in MMW region by using Fresnel lens structure. Fundamental focusing properties of the Fresnel structure made of engineering plastic material and MMW transmission properties of stacked electrode structure for LC drive are empirically studied in detail.
{"title":"Fundamental properties of Fresnel lens in MMW region for liquid crystal lens applications","authors":"T. Nose, Takashi Seno, Ryohei Yuri, R. Ito, M. Honma","doi":"10.1109/IRMMW-THZ.2011.6104826","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104826","url":null,"abstract":"Quasi optic approach for liquid crystal device application is investigated in MMW region by using Fresnel lens structure. Fundamental focusing properties of the Fresnel structure made of engineering plastic material and MMW transmission properties of stacked electrode structure for LC drive are empirically studied in detail.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"18 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":"78025513","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.2011.6105233
T. Ito, R. Ito, M. Honma, Takeshi Watanabe, K. Ito, S. Yanagihara, T. Nose
New fabrication method to attain extremely thick liquid crystal (LC) layer is investigated for LC control device applications in MMW and THz wave region. Here, we are focusing on the porous PMMA materials to impregnate nematic LC materials.
{"title":"Polymer matrix type of liquid crystals for MMW and THz application","authors":"T. Ito, R. Ito, M. Honma, Takeshi Watanabe, K. Ito, S. Yanagihara, T. Nose","doi":"10.1109/IRMMW-THZ.2011.6105233","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105233","url":null,"abstract":"New fabrication method to attain extremely thick liquid crystal (LC) layer is investigated for LC control device applications in MMW and THz wave region. Here, we are focusing on the porous PMMA materials to impregnate nematic LC materials.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"18 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":"80013265","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.2011.6105144
O. Sinitsyn, R. Pu, G. Nusinovich, T. Antonsen
In this paper, the authors investigate possibilities of gyrotron operation in high order modes on the second cyclotron harmonic. Results are obtained with the use of the well-known gyrotron code MAGY. Particular attention is paid to finding the trade-off between Ohmic losses and the interaction efficiency when choosing the cavity geometry. Competition of the operating mode with the modes operating on the fundamental harmonic is analyzed.
{"title":"Studies of gyrotron second harmonic operation in high-order modes","authors":"O. Sinitsyn, R. Pu, G. Nusinovich, T. Antonsen","doi":"10.1109/IRMMW-THZ.2011.6105144","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105144","url":null,"abstract":"In this paper, the authors investigate possibilities of gyrotron operation in high order modes on the second cyclotron harmonic. Results are obtained with the use of the well-known gyrotron code MAGY. Particular attention is paid to finding the trade-off between Ohmic losses and the interaction efficiency when choosing the cavity geometry. Competition of the operating mode with the modes operating on the fundamental harmonic is analyzed.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"28 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":"80464890","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.2011.6104831
R. Dietz, M. Gerhard, J. Boettcher, H. Kuenzel, M. Koch, B. Sartorius, M. Schell
We present first results on photoconductive switches based on MBE grown InGaAs/InAlAs multi-nanolayer structures with separated trapping and photoconductive layers, the later exhibiting high carrier mobility. The high mobility significantly increases the optical power-to-THz conversion efficiency, while the emitted THz bandwidth exceeds 3 THz.
{"title":"Photoconductive THz generation at 1.5 μm excitation in InGaAs/InAlAs structures with separated photoconductive and trapping layers","authors":"R. Dietz, M. Gerhard, J. Boettcher, H. Kuenzel, M. Koch, B. Sartorius, M. Schell","doi":"10.1109/IRMMW-THZ.2011.6104831","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104831","url":null,"abstract":"We present first results on photoconductive switches based on MBE grown InGaAs/InAlAs multi-nanolayer structures with separated trapping and photoconductive layers, the later exhibiting high carrier mobility. The high mobility significantly increases the optical power-to-THz conversion efficiency, while the emitted THz bandwidth exceeds 3 THz.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"78 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":"81262897","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.2011.6104817
B. R. Sangala, P. Gerakines, D. Hilton
We use terahertz time domain spectroscopy to study the absorption (0.2–2 THz) of cubic α-N2 from 10–30 K. These experiments observe a strong absorption feature at 1.47 THz that cannot be explained by purely induced dipole absorption. We study the influence of impurities on this absorption.
{"title":"Terahertz time-domain spectroscopy of α-nitrogen ice","authors":"B. R. Sangala, P. Gerakines, D. Hilton","doi":"10.1109/IRMMW-THZ.2011.6104817","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104817","url":null,"abstract":"We use terahertz time domain spectroscopy to study the absorption (0.2–2 THz) of cubic α-N2 from 10–30 K. These experiments observe a strong absorption feature at 1.47 THz that cannot be explained by purely induced dipole absorption. We study the influence of impurities on this absorption.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"9 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":"84241187","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.2011.6104819
I. Al-Naib, M. Shalaby, T. Ozaki, R. Morandotti
We propose diagonally arranged terahertz macrocells for the realization of high Q-factor resonators. Our results show that the double-SRR diagonal macrocell structure exhibits an improved quality factor, while a spectral collapse is noticed for the triple-SRR diagonal configuration. The experimental results are in good agreement with the simulations.
{"title":"Terahertz diagonal macrocell planar metamaterials","authors":"I. Al-Naib, M. Shalaby, T. Ozaki, R. Morandotti","doi":"10.1109/IRMMW-THZ.2011.6104819","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104819","url":null,"abstract":"We propose diagonally arranged terahertz macrocells for the realization of high Q-factor resonators. Our results show that the double-SRR diagonal macrocell structure exhibits an improved quality factor, while a spectral collapse is noticed for the triple-SRR diagonal configuration. The experimental results are in good agreement with the simulations.","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":"85230278","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.2011.6105054
J. Lusakowski, M. Białek, D. Yavorskiy, J. Marczewski, P. Kopyt, W. Gwarek, W. Knap, K. Kucharski, M. Grodner, M. Górska, P. Grabiec
A set of planar antennas was numerically designed to optimize detection of 340 GHz with Si MOSFETs. A series of MOSFETs monolithically coupled with different types of slot antennas was fabricated and tested as room temperature detectors. The MOSFETs of different sizes were fabricated on a SOI substrate thinned down to 40 μm. We observed a photovoltaic non-resonant detection signal and its strong dependence on the modulation frequency of the incident beam. We found that the signal does not strongly depend on geometrical parameters of MOSFETs.
{"title":"Planar antennas for detection of 340 GHz band with single Si metal-oxide-semiconductor field-effect transistors","authors":"J. Lusakowski, M. Białek, D. Yavorskiy, J. Marczewski, P. Kopyt, W. Gwarek, W. Knap, K. Kucharski, M. Grodner, M. Górska, P. Grabiec","doi":"10.1109/IRMMW-THZ.2011.6105054","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105054","url":null,"abstract":"A set of planar antennas was numerically designed to optimize detection of 340 GHz with Si MOSFETs. A series of MOSFETs monolithically coupled with different types of slot antennas was fabricated and tested as room temperature detectors. The MOSFETs of different sizes were fabricated on a SOI substrate thinned down to 40 μm. We observed a photovoltaic non-resonant detection signal and its strong dependence on the modulation frequency of the incident beam. We found that the signal does not strongly depend on geometrical parameters of MOSFETs.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"1 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":"85633290","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.2011.6105057
Takuji Kimura, J. Atkinson, B. Brar, R. Borwick, Carol Chen, M. Field, T. Grant, T. Hunter
We report on the design and fabrication of a sheet beam traveling-wave tube (TWT) amplifier being developed under the DARPA HiFIVE program. The device is designed to achieve over 50 W output power at 220 GHz with a power-bandwidth product exceeding 1 kW-GHz.
{"title":"Development of a 220 GHz, 50 W sheet-beam traveling wave tube","authors":"Takuji Kimura, J. Atkinson, B. Brar, R. Borwick, Carol Chen, M. Field, T. Grant, T. Hunter","doi":"10.1109/IRMMW-THZ.2011.6105057","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105057","url":null,"abstract":"We report on the design and fabrication of a sheet beam traveling-wave tube (TWT) amplifier being developed under the DARPA HiFIVE program. The device is designed to achieve over 50 W output power at 220 GHz with a power-bandwidth product exceeding 1 kW-GHz.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"4 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":"81013884","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.2011.6104951
J. Sirigiri, T. Maly, L. Tarricone
We present the design of a compact, tunable 395 GHz, 20 W gyrotron oscillator for application in Dynamic Nuclear Polarization-enhanced NMR experiments (DNP-NMR). The gyrotron is designed to work in an actively shielded NMR magnet, is tunable and provides > 2W of power over a bandwidth of 1 GHz.
{"title":"A compact 395 GHz gyrotron for Dynamic Nuclear Polarization","authors":"J. Sirigiri, T. Maly, L. Tarricone","doi":"10.1109/IRMMW-THZ.2011.6104951","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104951","url":null,"abstract":"We present the design of a compact, tunable 395 GHz, 20 W gyrotron oscillator for application in Dynamic Nuclear Polarization-enhanced NMR experiments (DNP-NMR). The gyrotron is designed to work in an actively shielded NMR magnet, is tunable and provides > 2W of power over a bandwidth of 1 GHz.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"5 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":"84104954","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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