Pub Date : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6104809
C. Ponseca, Kaibo Zheng, T. Pullerits, V. Sundstrom
Charge generation, injection and recombination in quantum dot-sensitized ZnO nanowires was probed using time resolved terahertz spectroscopy. The mobility spectrum at different representative pump-probe delays showed similar behavior during the injection time indicating free charges on the nanowire structures.
{"title":"Charge carrier dynamics of quantum dot-sensitized ZnO nanowires probed by time resolved terahertz spectroscopy","authors":"C. Ponseca, Kaibo Zheng, T. Pullerits, V. Sundstrom","doi":"10.1109/IRMMW-THZ.2011.6104809","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104809","url":null,"abstract":"Charge generation, injection and recombination in quantum dot-sensitized ZnO nanowires was probed using time resolved terahertz spectroscopy. The mobility spectrum at different representative pump-probe delays showed similar behavior during the injection time indicating free charges on the nanowire structures.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"104 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":"85092136","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.2011.6104921
R. Muller, A. Steiger
PTB is operating the worldwide first and only traceable THz detector calibration facility. This facility is currently running at 2.52 THz but is to be expanded to cover the spectral range from 1 THz to 5 THz.
{"title":"Traceable power measurement from 1 THz-5 THz","authors":"R. Muller, A. Steiger","doi":"10.1109/IRMMW-THZ.2011.6104921","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104921","url":null,"abstract":"PTB is operating the worldwide first and only traceable THz detector calibration facility. This facility is currently running at 2.52 THz but is to be expanded to cover the spectral range from 1 THz to 5 THz.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"23 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":"81846895","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.2011.6104971
A. Roggenbuck, A. Deninger, K. Thirunavukkuarasu, H. Schmitz, J. Marx, E. Vidal, M. Langenbach, J. Hemberger, M. Gruninger
We realized a continuous-wave terahertz spectrometer with two fiber stretchers for rapid phase modulation. Both the terahertz amplitude and phase are determined from 0.06 THz to 1.8 THz with a 1 GHz step size in less than 10 min. We show transmission data of Silicon at cryogenic temperatures.
{"title":"A fast cw-THz spectrometer using fiber stretchers","authors":"A. Roggenbuck, A. Deninger, K. Thirunavukkuarasu, H. Schmitz, J. Marx, E. Vidal, M. Langenbach, J. Hemberger, M. Gruninger","doi":"10.1109/IRMMW-THZ.2011.6104971","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104971","url":null,"abstract":"We realized a continuous-wave terahertz spectrometer with two fiber stretchers for rapid phase modulation. Both the terahertz amplitude and phase are determined from 0.06 THz to 1.8 THz with a 1 GHz step size in less than 10 min. We show transmission data of Silicon at cryogenic temperatures.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"72 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":"83997768","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.2011.6105223
Abhishek Singh, N. Awari, S. Prabhu, A. Vengurlekar
We study the THz radiation emission from interdigitated Photo-Conductive Antennas (iPCAs) fabricated on Semi-insulating GaAs substrates and excited using 800nm, 10fs, 76MHz laser pulses through circular and cylindrical Microlens arrays put over the antennas. THz emission is an order of magnitude higher from cylindrical micro-lens array compared to circular micro-lens array, at the same bias voltage. The line excitation appears to be more efficient in generating THz than a point excitation.
{"title":"THz from photoconductive antennas using circular and cylindrical Microlens arrays","authors":"Abhishek Singh, N. Awari, S. Prabhu, A. Vengurlekar","doi":"10.1109/IRMMW-THZ.2011.6105223","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105223","url":null,"abstract":"We study the THz radiation emission from interdigitated Photo-Conductive Antennas (iPCAs) fabricated on Semi-insulating GaAs substrates and excited using 800nm, 10fs, 76MHz laser pulses through circular and cylindrical Microlens arrays put over the antennas. THz emission is an order of magnitude higher from cylindrical micro-lens array compared to circular micro-lens array, at the same bias voltage. The line excitation appears to be more efficient in generating THz than a point excitation.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"53 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":"83289621","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.2011.6105224
E. Matsubara, M. Ashida
Focusing an intense sub 10 fs pulse together with its second harmonics in air, we have generated ultrabroadband coherent infrared wave ranging from far infrared to over 200 THz. Measurement with time domain spectroscopy assures that the wave is coherent. The mid infrared to near infrared component is observed with an HgCdTe detector.
{"title":"Ultrabroadband coherent electric field generation from far infrared to 200 THz using air plasma induced by sub 10 fs pulses","authors":"E. Matsubara, M. Ashida","doi":"10.1109/IRMMW-THZ.2011.6105224","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105224","url":null,"abstract":"Focusing an intense sub 10 fs pulse together with its second harmonics in air, we have generated ultrabroadband coherent infrared wave ranging from far infrared to over 200 THz. Measurement with time domain spectroscopy assures that the wave is coherent. The mid infrared to near infrared component is observed with an HgCdTe detector.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"40 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":"77725866","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.2011.6104877
M. Mahjoub, N. Aoki, J. Song, J. Bird, D. Ferry, Y. Kawano, K. Ishibashi, Y. Ochiai
In order to study on THz radiation pick upping by use of graphene nano-structures, we explore the use of quntum dot as nano scale GHz-THz detector with a high sensitive and/or a wide range frequency response. A fundamental possibility in the device application has been studied.
{"title":"High frequency transport in bi-layer graphene FET devices","authors":"M. Mahjoub, N. Aoki, J. Song, J. Bird, D. Ferry, Y. Kawano, K. Ishibashi, Y. Ochiai","doi":"10.1109/IRMMW-THZ.2011.6104877","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104877","url":null,"abstract":"In order to study on THz radiation pick upping by use of graphene nano-structures, we explore the use of quntum dot as nano scale GHz-THz detector with a high sensitive and/or a wide range frequency response. A fundamental possibility in the device application has been studied.","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":"82400992","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.2011.6104812
D. S. Rana, R. Rana, N. Awari, Parul Pandey, Abhishek Singh, S. Prabhu
Terahertz time domain spectroscopy was employed to explore the low-energy dynamics in the half-doped Nd0.5Sr0.5MnO3 (100) films. We have observed evolution of a peak structure in conductivity at around ∼4 meV which suggests the existence of charge-density waves.
{"title":"Terahertz time domain spectroscopic evidence of charge-density-waves in Nd0.5Sr0.5MnO3 thin films","authors":"D. S. Rana, R. Rana, N. Awari, Parul Pandey, Abhishek Singh, S. Prabhu","doi":"10.1109/IRMMW-THZ.2011.6104812","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104812","url":null,"abstract":"Terahertz time domain spectroscopy was employed to explore the low-energy dynamics in the half-doped Nd<inf>0.5</inf>Sr<inf>0.5</inf>MnO<inf>3</inf> (100) films. We have observed evolution of a peak structure in conductivity at around ∼4 meV which suggests the existence of charge-density waves.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"63 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":"78641544","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.2011.6104856
Choonsup Lee, N. Llombart, C. Jung, G. Chattopadhyay, I. Mehdi
We have developed a 5 × 5 silicon microlens array using silicon micromachining technique for silicon based THz antenna array. The feature of silicon micromachining technique enables one to microfabricate unlimited number of microlens arrays at one time with good uniformity on a silicon wafer. This technique will resolve one of the key issues in building THz camera which is to integrate antennas in detector array.
{"title":"Silicon micromachined microlens array for THz antenna","authors":"Choonsup Lee, N. Llombart, C. Jung, G. Chattopadhyay, I. Mehdi","doi":"10.1109/IRMMW-THZ.2011.6104856","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104856","url":null,"abstract":"We have developed a 5 × 5 silicon microlens array using silicon micromachining technique for silicon based THz antenna array. The feature of silicon micromachining technique enables one to microfabricate unlimited number of microlens arrays at one time with good uniformity on a silicon wafer. This technique will resolve one of the key issues in building THz camera which is to integrate antennas in detector array.","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":"78834338","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.2011.6105093
A. Vaccaro, G. Aiello, A. Meier, T. Scherer, S. Schreck, P. Spaeh, D. Strauss, J. Stober, D. Wagner, H. de Wit
CVD diamond is a well known excellent low loss material (tan δ ≤ 10−5) for microwave transmission e.g. in fusion reactors for the ECRH&CD system. Laser processing of diamond discs allows the artificial formation of grooves on diamond disc surfaces. A potential application is the design of windows with a surface finish offering an increased bandwidth. As grooves with sharp edges and corners might lead to local stress accumulation beyond tolerable limits, the method has been checked by FEM analyses. The results are here summarized.
{"title":"Grooved CVD diamond windows: Grooves' profiles and structural simulations","authors":"A. Vaccaro, G. Aiello, A. Meier, T. Scherer, S. Schreck, P. Spaeh, D. Strauss, J. Stober, D. Wagner, H. de Wit","doi":"10.1109/IRMMW-THZ.2011.6105093","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105093","url":null,"abstract":"CVD diamond is a well known excellent low loss material (tan δ ≤ 10−5) for microwave transmission e.g. in fusion reactors for the ECRH&CD system. Laser processing of diamond discs allows the artificial formation of grooves on diamond disc surfaces. A potential application is the design of windows with a surface finish offering an increased bandwidth. As grooves with sharp edges and corners might lead to local stress accumulation beyond tolerable limits, the method has been checked by FEM analyses. The results are here summarized.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"49 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":"90474360","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.2011.6104830
R. Lewis
Geometrical factors play an important role in the emission of terahertz radiation from semiconductors, as has been recognized for many years. This is particularly the case for the mechanism of optical rectification. Early work in the area was concerned with simple geometric arrangements, such as normal incidence of the pump radiation on the emitter surface, and low-index crystal faces, such as (001), (011), and (111). In this paper the general problem will be described for arbitrary angles of incidence and detection relative to the emitter crystal axes. It is seen that new information about the bulk and surface contributions to the optical rectification emission is obtained.
{"title":"Geometrical factors in the emission of terahertz radiation from semiconductors under excitation by sub-picosecond pump pulses","authors":"R. Lewis","doi":"10.1109/IRMMW-THZ.2011.6104830","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104830","url":null,"abstract":"Geometrical factors play an important role in the emission of terahertz radiation from semiconductors, as has been recognized for many years. This is particularly the case for the mechanism of optical rectification. Early work in the area was concerned with simple geometric arrangements, such as normal incidence of the pump radiation on the emitter surface, and low-index crystal faces, such as (001), (011), and (111). In this paper the general problem will be described for arbitrary angles of incidence and detection relative to the emitter crystal axes. It is seen that new information about the bulk and surface contributions to the optical rectification emission is obtained.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"24 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":"89163017","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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