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Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.最新文献

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Absorption of terahertz radiations in two-dimensional semiconductors 二维半导体中太赫兹辐射的吸收
Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004. Pub Date : 2004-01-01 DOI: 10.1109/ICIMW.2004.1422180
J. Cao
{"title":"Absorption of terahertz radiations in two-dimensional semiconductors","authors":"J. Cao","doi":"10.1109/ICIMW.2004.1422180","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422180","url":null,"abstract":"Nonlinear free-carrier absorption of terahertz radiations in semiconductor heterojunctions have theoretically been investigated by considering multiple photon process and conduction-valence interband impact ionisation (II). We have determined the field and frequency dependent absorption rate. It is found that electron-disorder scatterings are important at low to intermediate fields, and the high field absorption is dominated by II processes.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":"35 1","pages":"495-496"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78078369","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}
引用次数: 0
The enhanced infrared absorption on different types of metal nano-particle films 不同类型金属纳米颗粒薄膜的红外吸收增强
Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004. Pub Date : 2004-01-01 DOI: 10.1109/ICIMW.2004.1422143
A. Priebe, G. Fahsold, A. Pucci
{"title":"The enhanced infrared absorption on different types of metal nano-particle films","authors":"A. Priebe, G. Fahsold, A. Pucci","doi":"10.1109/ICIMW.2004.1422143","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422143","url":null,"abstract":"The surface enhanced infrared absorption (SEIRA) of adsorbates on nano-structured metal films is widely exploited in chemistry and biology, but the basic effects are only partially understood. Our IR transmittance studies of thin metal films under ultra-high vacuum (UHV) conditions showed two types of SEIRA lines. The systems investigated were C/sub 2/H/sub 4/ and C/sub 2/H/sub 6/, respectively, on cold-deposited Cu films, on transparent substrates (MgO, KBr) and on Cu films prepared at room temperature on the same substrates. For the room-temperature films only the IR-active vibrations of the adsorbates give SEIRA lines, which can be explained by interaction of the molecules with the electromagnetic field. On cold-deposited films also Raman-active lines of C/sub 2/H/sub 4/ appear in the IR-transmittance spectra. These lines saturate already below monolayer coverage. For C/sub 2/H/sub 6/ Raman bands like in SERS of C/sub 2/H/sub 6/ on cold-deposited silver are not observed. The appearance of the Raman lines of centrosymmetric molecules in the IR spectra is a first-layer effect and should be due to an indirect excitation mechanism involving metal electrons. For this mechanism roughness on an atomic scale and an adsorbate /spl pi/* state are important.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":"25 1","pages":"425-426"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79970534","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}
引用次数: 0
A novel terahertz plasma-wave photomixer with resonant-cavity enhanced structure 一种谐振腔增强结构的太赫兹等离子体光混合器
Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004. Pub Date : 2004-01-01 DOI: 10.1109/ICIMW.2004.1422093
T. Otsuji, M. Hanabe, J. Shigenobu, S. Takahashi, E. Sano
{"title":"A novel terahertz plasma-wave photomixer with resonant-cavity enhanced structure","authors":"T. Otsuji, M. Hanabe, J. Shigenobu, S. Takahashi, E. Sano","doi":"10.1109/ICIMW.2004.1422093","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422093","url":null,"abstract":"Two-dimensional (2D) plasmon in a submicron transistor channel can make resonant oscillation in the terahertz range. We propose a novel terahertz plasma-wave photomixer that can improve the conversion gain and terahertz radiation power. The photomixer is based on a high-electron mobility transistor (HEMT) and incorporates doubly interdigitated grating strips for the gate electrodes that periodically localize the 2D plasmons in sub 100-nm regions with a micron-order interval. A vertical cavity structure is formed in between the top metal grating and a terahertz mirror placed at the backside. FDTD simulation demonstrates that a newly-introduced vertical cavity structure effectively enhances the conversion gain and radiation power.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":"30 1","pages":"331-332"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76763729","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}
引用次数: 6
A new technique for permittivity and permeability measurements at millimeter waves 毫米波介电常数和磁导率测量新技术
Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004. Pub Date : 2004-01-01 DOI: 10.1109/ICIMW.2004.1422123
V. Apletalin, Y. Kazantsev, V. Solosin, A. Zubov
{"title":"A new technique for permittivity and permeability measurements at millimeter waves","authors":"V. Apletalin, Y. Kazantsev, V. Solosin, A. Zubov","doi":"10.1109/ICIMW.2004.1422123","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422123","url":null,"abstract":"A new technique is proposed to determine the permittivity and permeability of planar samples at millimeter wavelengths. The values of /spl epsiv/ and /spl mu/ are determined from the measurement of power reflected from the system planar specimen + metallic reflector for various positions of the reflector. The technique is realized using the precise quasioptical reflectometer.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":"22 1","pages":"385-386"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81460907","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}
引用次数: 0
X-band photoinjector/high gradient accelerator based light source x波段光注入器/高梯度加速器光源
Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004. Pub Date : 2004-01-01 DOI: 10.1109/ICIMW.2004.1422214
J. Heritage, A. Vlieks, C. DeStefano, W. Frederick, G. Caryotakis, N. Luhmann, D. Martin, E. Landahl
{"title":"X-band photoinjector/high gradient accelerator based light source","authors":"J. Heritage, A. Vlieks, C. DeStefano, W. Frederick, G. Caryotakis, N. Luhmann, D. Martin, E. Landahl","doi":"10.1109/ICIMW.2004.1422214","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422214","url":null,"abstract":"A compact source of monochromatic ultrashort X-ray pulses tunable in the 10 to 85 keV range is obtained from Compton scattering of intense sub-picosecond optical pulses with relativistic electron bunches. Unlike conventional large National Laboratory scale synchrotron radiation sources, the relativistic Compton device utilizes compact vacuum components including a single X-band klystron, a 5.5 cell photoinjector, and a 1.05-meter, high-gradient linear accelerator. Optical radiation is generated by a tabletop synchronized titanium:sapphire femtosecond laser oscillator and amplifier system. Our source holds great potential as a compact probe of inner shell bound electrons in heavy atoms for medical diagnostics and therapeutics, as well as for studies of fundamental atomic-scale physics.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":"35 1","pages":"563-564"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82294375","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}
引用次数: 0
Excitation spectroscopy of Si:P THz laser and infrared photoconductivity in Ge:Te Si:P太赫兹激光的激发光谱与Ge:Te中的红外光导
Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004. Pub Date : 2004-01-01 DOI: 10.1109/ICIMW.2004.1422186
H. Nakata, A. Yokoyama, T. Hatou, T. Ohyama, N. Tsubouchi, S. Pavlov, H. W. Heubers
{"title":"Excitation spectroscopy of Si:P THz laser and infrared photoconductivity in Ge:Te","authors":"H. Nakata, A. Yokoyama, T. Hatou, T. Ohyama, N. Tsubouchi, S. Pavlov, H. W. Heubers","doi":"10.1109/ICIMW.2004.1422186","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422186","url":null,"abstract":"We observed infrared photoconductivity in Ge:Te and THz laser emission from Si:P excited by a free electron laser (FEL) or CO/sub 2/ lasers. The emission intensity decreases with increasing photon energy of the FEL in the range of about 120 meV. Photoconductivity spectra of Ge:Te has LO phonon structures.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":"1 1","pages":"507-508"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76334883","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}
引用次数: 0
Precision mm wave multibeam radio telescope - control and diagnostics system 精密毫米波多波束射电望远镜控制与诊断系统
Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004. Pub Date : 2004-01-01 DOI: 10.1109/ICIMW.2004.1422153
V. Khaikin, S. R. Zhelenkov, S. V. Kaplya
{"title":"Precision mm wave multibeam radio telescope - control and diagnostics system","authors":"V. Khaikin, S. R. Zhelenkov, S. V. Kaplya","doi":"10.1109/ICIMW.2004.1422153","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422153","url":null,"abstract":"A radio telescope control and diagnostics system which has met hard enough requirements to pointing, tracking and scanning of the Sun with a multibeam radio telescope in short mm band is described. Radio telescope pointing and tracking accuracy tested in solar observations are presented.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":"68 1","pages":"441-442"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76534079","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}
引用次数: 0
High power microwave amplification using a novel fast wave gyro-TWA 一种新型快波陀螺- twa的高功率微波放大
Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004. Pub Date : 2004-01-01 DOI: 10.1109/ICIMW.2004.1422253
J. Thomson, A. Phelps, A. Cross, W. He, E. G. Rafferty, K. Ronald, C. Whyte, A. Young
{"title":"High power microwave amplification using a novel fast wave gyro-TWA","authors":"J. Thomson, A. Phelps, A. Cross, W. He, E. G. Rafferty, K. Ronald, C. Whyte, A. Young","doi":"10.1109/ICIMW.2004.1422253","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422253","url":null,"abstract":"Gyro-TWA (gyro-travelling wave amplifier) experiments are being undertaken employing a novel helically corrugated waveguide. Numerical and experimental techniques for determination of the waveguide dispersion characteristics are presented. A helically corrugated interaction structure designed and optimized for use with a novel cusp gun in a gyro-amplifier is discussed.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":"69 1","pages":"639-640"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76031078","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}
引用次数: 0
Compact, optically pumped THz gas laser for SOFIA 用于SOFIA的紧凑光泵太赫兹气体激光器
Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004. Pub Date : 2004-01-01 DOI: 10.1109/ICIMW.2004.1422079
M. Schwarz, B. Gunther, H. Richter, K. Rosner, H. Hubers
{"title":"Compact, optically pumped THz gas laser for SOFIA","authors":"M. Schwarz, B. Gunther, H. Richter, K. Rosner, H. Hubers","doi":"10.1109/ICIMW.2004.1422079","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422079","url":null,"abstract":"To date optically pumped gas lasers are used as local oscillators in heterodyne receivers at frequencies above 2 THz. In this report we describe the design and performance of a compact 1-5 THz gas laser which is operated in a heterodyne receiver aboard of SOFIA, the Stratospheric Observatory for Infrared Astronomy.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":"11 1","pages":"307-308"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88337648","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}
引用次数: 0
Generation and detection of terahertz radiation by non-resonant nonlinear process in GaAs using 1.56 /spl mu/m fiber laser pulses 1.56 /spl μ m光纤激光脉冲在GaAs中非共振非线性过程中产生和探测太赫兹辐射
Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004. Pub Date : 2004-01-01 DOI: 10.1109/ICIMW.2004.1422179
Masaya Nagai, Shingo Saito, Hideyuki Ohtake, T. Bessho, T. Sugiura, T. Hirosumi, M. Yoshida, Koichiro Tanaka
{"title":"Generation and detection of terahertz radiation by non-resonant nonlinear process in GaAs using 1.56 /spl mu/m fiber laser pulses","authors":"Masaya Nagai, Shingo Saito, Hideyuki Ohtake, T. Bessho, T. Sugiura, T. Hirosumi, M. Yoshida, Koichiro Tanaka","doi":"10.1109/ICIMW.2004.1422179","DOIUrl":"https://doi.org/10.1109/ICIMW.2004.1422179","url":null,"abstract":"We demonstrate the generation and detection of a terahertz wave by non-resonant electro-optical processes with femtosecond 1.56 /spl mu/m laser pulses. Using a 0.5 mm-thick [110]-oriented GaAs wafer for optical rectification and electro-optical modulation, we achieve spectral sensitivity up to 3 THz. For high net efficiency of nonlinear process, it is important to evaluate the phase matching condition in electro-optical crystals.","PeriodicalId":13627,"journal":{"name":"Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.","volume":"22 1","pages":"493-494"},"PeriodicalIF":0.0,"publicationDate":"2004-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82720666","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}
引用次数: 1
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