Pub Date : 2002-11-07DOI: 10.1109/THZ.2002.1037605
J. R. Thorpe, J. R. Fletcher, J. M. Chamberlain, R. Miles, J. García-García, C. Mann, E. Huq, M. Oldfield, J. Spencer
The development of a micromachined submillimeter wave reflex klystron structure is described. An outline analysis is given of the key theoretical issues, such as oscillation and starting conditions, and how the output power scales with frequency. Two techniques for the realisation of the cavity assembly are outlined. The preferred method results in a free-standing gold re-entrant cavity of high surface quality. Field emitter tips are planned for use in this device: the present status of performance of these is described.
{"title":"Development of a submillimeter wave reflex klystron","authors":"J. R. Thorpe, J. R. Fletcher, J. M. Chamberlain, R. Miles, J. García-García, C. Mann, E. Huq, M. Oldfield, J. Spencer","doi":"10.1109/THZ.2002.1037605","DOIUrl":"https://doi.org/10.1109/THZ.2002.1037605","url":null,"abstract":"The development of a micromachined submillimeter wave reflex klystron structure is described. An outline analysis is given of the key theoretical issues, such as oscillation and starting conditions, and how the output power scales with frequency. Two techniques for the realisation of the cavity assembly are outlined. The preferred method results in a free-standing gold re-entrant cavity of high surface quality. Field emitter tips are planned for use in this device: the present status of performance of these is described.","PeriodicalId":143116,"journal":{"name":"Proceedings, IEEE Tenth International Conference on Terahertz Electronics","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127009651","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 : 2002-11-07DOI: 10.1109/THZ.2002.1037586
M. Johnston, A. Dowd, D. Whittaker, A. Corchia, A. Davies, E. Linfield
We have studied the generation of coherent pulses of terahertz (THz) radiation from semiconductor surfaces both experimentally and using a Monte-Carlo carrier dynamics simulation. Collimated THz beams are observed from surface-field THz emitters and three methods of improving the efficiency of these emitters are demonstrated: (i) by applying a magnetic field, (ii) by reducing the effective refractive index of the device and (iii) by altering the geometry of the device. An enhancement of 21/spl times/ is seen in a prism based GaAs/InAs THz emitter.
{"title":"Enhancement of THz emission from semiconductor surfaces","authors":"M. Johnston, A. Dowd, D. Whittaker, A. Corchia, A. Davies, E. Linfield","doi":"10.1109/THZ.2002.1037586","DOIUrl":"https://doi.org/10.1109/THZ.2002.1037586","url":null,"abstract":"We have studied the generation of coherent pulses of terahertz (THz) radiation from semiconductor surfaces both experimentally and using a Monte-Carlo carrier dynamics simulation. Collimated THz beams are observed from surface-field THz emitters and three methods of improving the efficiency of these emitters are demonstrated: (i) by applying a magnetic field, (ii) by reducing the effective refractive index of the device and (iii) by altering the geometry of the device. An enhancement of 21/spl times/ is seen in a prism based GaAs/InAs THz emitter.","PeriodicalId":143116,"journal":{"name":"Proceedings, IEEE Tenth International Conference on Terahertz Electronics","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114753244","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 : 2002-07-29DOI: 10.1109/THZ.2002.1037588
K. Imai, K. Kawase, H. Minamide, H. Ito
An achromatically injection-seeded terahertz-wave parametric generator (ais-TPG) was constructed using MgO:LiNbO/sub 3/ crystals and a tunable seeder using a stationary dispersion-compensated optical arrangement. Without readjusting the mirrors, smooth tuning of the terahertz-wave over the 0.6/spl sim/2.6 THz range was obtained by adjusting the seeder wavelength alone. The feasibility of this system for terahertz-wave absorption measurements over a wide frequency range was successfully demonstrated using low-pressure water vapor.
{"title":"Achromatically injection-seeded terahertz-wave parametric generator","authors":"K. Imai, K. Kawase, H. Minamide, H. Ito","doi":"10.1109/THZ.2002.1037588","DOIUrl":"https://doi.org/10.1109/THZ.2002.1037588","url":null,"abstract":"An achromatically injection-seeded terahertz-wave parametric generator (ais-TPG) was constructed using MgO:LiNbO/sub 3/ crystals and a tunable seeder using a stationary dispersion-compensated optical arrangement. Without readjusting the mirrors, smooth tuning of the terahertz-wave over the 0.6/spl sim/2.6 THz range was obtained by adjusting the seeder wavelength alone. The feasibility of this system for terahertz-wave absorption measurements over a wide frequency range was successfully demonstrated using low-pressure water vapor.","PeriodicalId":143116,"journal":{"name":"Proceedings, IEEE Tenth International Conference on Terahertz Electronics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2002-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133415212","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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