Pub Date : 2011-12-15DOI: 10.1109/IRMMW-THZ.2011.6104848
V. N. Trukhin, A. Golubok, L. L. Samoilov
We report on the experimental study of the probe shape dependency on terahertz near-field enhancement near the tip of a metallic probe in the apertureless terahertz scanning near-field microscope. It was established that terahertz near-field signal is strongly controlled by the cone shape of the probe and varies by an order of magnitude depending on the shape of the probe.
{"title":"Probe shape effect on near-field enhancement in apertureless terahertz near-field microscope","authors":"V. N. Trukhin, A. Golubok, L. L. Samoilov","doi":"10.1109/IRMMW-THZ.2011.6104848","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104848","url":null,"abstract":"We report on the experimental study of the probe shape dependency on terahertz near-field enhancement near the tip of a metallic probe in the apertureless terahertz scanning near-field microscope. It was established that terahertz near-field signal is strongly controlled by the cone shape of the probe and varies by an order of magnitude depending on the shape of the probe.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"227 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":"75167342","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.2011.6105173
C. Russell, C. Wood, L. Dazhang, A. Burnett, L. Li, E. Linfield, A. Davies, J. Cunningham
We demonstrate an increase in bandwidth, from 600 GHz to 1.5 THz, of planar Goubau-line on-chip devices with integrated low-temperature-grown (LT) GaAs photoconductive (PC) switches, using a substrate-thinning technique. The effect of substrate thinning was investigated both experimentally and theoretically, and the increase in bandwidth then used for spectroscopy of overlaid polycrystalline materials.
{"title":"Increasing the bandwidth of planar on-chip THz devices for spectroscopic applications","authors":"C. Russell, C. Wood, L. Dazhang, A. Burnett, L. Li, E. Linfield, A. Davies, J. Cunningham","doi":"10.1109/IRMMW-THZ.2011.6105173","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105173","url":null,"abstract":"We demonstrate an increase in bandwidth, from 600 GHz to 1.5 THz, of planar Goubau-line on-chip devices with integrated low-temperature-grown (LT) GaAs photoconductive (PC) switches, using a substrate-thinning technique. The effect of substrate thinning was investigated both experimentally and theoretically, and the increase in bandwidth then used for spectroscopy of overlaid polycrystalline materials.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"25 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":"78301139","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.2011.6105046
T. Gobel, D. Stanze, R. Dietz, H. Roehle, M. Schlak, B. Sartorius, M. Schell
Telecom components and electro-optic THz phase control allow the realization of an integrated THz control unit. It enables to control any parameter of the THz signal in CW THz photomixing systems with standard electronic equipment. This significantly reduces size and cost of future CW THz systems.
{"title":"Next generation continuous wave photomixing THz systems","authors":"T. Gobel, D. Stanze, R. Dietz, H. Roehle, M. Schlak, B. Sartorius, M. Schell","doi":"10.1109/IRMMW-THZ.2011.6105046","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105046","url":null,"abstract":"Telecom components and electro-optic THz phase control allow the realization of an integrated THz control unit. It enables to control any parameter of the THz signal in CW THz photomixing systems with standard electronic equipment. This significantly reduces size and cost of future CW THz systems.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"6 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":"75126113","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.2011.6104948
Xiaohuan Fu, K. Attenkofer, T.T.Y. Wong
We present a coplanar waveguide design with integrated photoconductive transceivers; the system is fabricated on a 1.4-μm-thick SiO2/Si3N4 membrane supported by a micromachined silicon substrate. LTG GaAs is used as photon absorbing material of the photoconductive switches allowing full electron mobility at strongly reduced carrier-lifetime. By combining this circuit with a bonded sample cell, we are able to measure transmitted, reflected intensity and its phase correlations. The system was characterized by theoretical calculation and simulations.
{"title":"Development of a chip-based micromachined THz-spectrometer","authors":"Xiaohuan Fu, K. Attenkofer, T.T.Y. Wong","doi":"10.1109/IRMMW-THZ.2011.6104948","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104948","url":null,"abstract":"We present a coplanar waveguide design with integrated photoconductive transceivers; the system is fabricated on a 1.4-μm-thick SiO2/Si3N4 membrane supported by a micromachined silicon substrate. LTG GaAs is used as photon absorbing material of the photoconductive switches allowing full electron mobility at strongly reduced carrier-lifetime. By combining this circuit with a bonded sample cell, we are able to measure transmitted, reflected intensity and its phase correlations. The system was characterized by theoretical calculation and simulations.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"36 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":"75575457","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.2011.6104977
J. Abril, E. Nova, A. Broquetas, A. Aguasca, J. Romeu, L. Jofre
Interferometry at W Band can be exploited to form images of small deformations with precisions in the order of tenths of microns and retrieve surface relieves. An Interferometric Synthetic Aperture Radar setup is proposed in which the scattered field is focused using a combination of range compression and backpropagation algorithm. Interferometric images involving micrometric displacements have been obtained showing a good agreement between real and measured displacements. A metallic rough surface deformation test has been first performed, by imaging the phase difference between acquisitions before and after the displacement. The interferometric phase difference between acquisitions can be used to image local deformations from a range of several meters. Furthermore the interferogram coherence shows the degree of decorrelation of the radar reflectivity which provides valuable information for surface random change. Likewise the relief of the surface with an L-shape target is retrieved mapping the phase difference between the two receiving antennas, in this case an static scenario is required.
{"title":"Deforming and relief interferometric SAR imaging at W-band","authors":"J. Abril, E. Nova, A. Broquetas, A. Aguasca, J. Romeu, L. Jofre","doi":"10.1109/IRMMW-THZ.2011.6104977","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104977","url":null,"abstract":"Interferometry at W Band can be exploited to form images of small deformations with precisions in the order of tenths of microns and retrieve surface relieves. An Interferometric Synthetic Aperture Radar setup is proposed in which the scattered field is focused using a combination of range compression and backpropagation algorithm. Interferometric images involving micrometric displacements have been obtained showing a good agreement between real and measured displacements. A metallic rough surface deformation test has been first performed, by imaging the phase difference between acquisitions before and after the displacement. The interferometric phase difference between acquisitions can be used to image local deformations from a range of several meters. Furthermore the interferogram coherence shows the degree of decorrelation of the radar reflectivity which provides valuable information for surface random change. Likewise the relief of the surface with an L-shape target is retrieved mapping the phase difference between the two receiving antennas, in this case an static scenario is required.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"26 3 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":"73232612","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.2011.6105088
M. Stecher, Stefan F. Durrschmidt, K. Nielsen, A. Stefani, H. K. Rasmussen, P. Jepsen, G. Town, O. Bang, M. Koch
We present terahertz near-field mode profiling of different polymer THz fibers. Images with a resolution below the THz wavelength show the fundamental mode profile and higher order modes appearing at higher frequencies.
{"title":"Mode profiling of THz fibers with dynamic aperture near-field imaging","authors":"M. Stecher, Stefan F. Durrschmidt, K. Nielsen, A. Stefani, H. K. Rasmussen, P. Jepsen, G. Town, O. Bang, M. Koch","doi":"10.1109/IRMMW-THZ.2011.6105088","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105088","url":null,"abstract":"We present terahertz near-field mode profiling of different polymer THz fibers. Images with a resolution below the THz wavelength show the fundamental mode profile and higher order modes appearing at higher frequencies.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"20 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":"73236927","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.2011.6104885
F. Horii, T. Idehara, Y. Fujii, I. Ogawa, A. Horii, G. Entzminger, F. D. Doty
Dynamic nuclear polarization (DNP) with a 131.5 GHz gyrotron (Gyrotron FU CW IV) has achieved enhancement factor of around 30 by using stable mono-radical 4-amino-TEMPO for 200 MHz high-resolution solid-state NMR spectroscopy for the analysis of polymer surface. Dependencies of the enhancement factor on irradiation time of the gyrotron output, the power of irradiation, cooling time, and irradiation frequency are examined. Application of the 200 MHz DNP NMR spectroscopy to the analysis of polymer surface is also presented briefly.
131.5 GHz回旋管(gyrotron FU CW IV)动态核极化(DNP)采用稳定的单自由基4-氨基- tempo进行200 MHz高分辨率固态核磁共振波谱分析，获得了30左右的增强因子。研究了辐照时间、辐照功率、冷却时间和辐照频率对增强系数的影响。简要介绍了200 MHz DNP核磁共振波谱在聚合物表面分析中的应用。
{"title":"200 MHz DNP NMR spectroscopy with a 131 GHz gyrotron for the analysis of polymer surface","authors":"F. Horii, T. Idehara, Y. Fujii, I. Ogawa, A. Horii, G. Entzminger, F. D. Doty","doi":"10.1109/IRMMW-THZ.2011.6104885","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6104885","url":null,"abstract":"Dynamic nuclear polarization (DNP) with a 131.5 GHz gyrotron (Gyrotron FU CW IV) has achieved enhancement factor of around 30 by using stable mono-radical 4-amino-TEMPO for 200 MHz high-resolution solid-state NMR spectroscopy for the analysis of polymer surface. Dependencies of the enhancement factor on irradiation time of the gyrotron output, the power of irradiation, cooling time, and irradiation frequency are examined. Application of the 200 MHz DNP NMR spectroscopy to the analysis of polymer surface is also presented briefly.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"57 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":"74506240","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.2011.6105225
A. K. Horestani, Z. Shaterian, S. Al-Sarawi, D. Abbott
Coplanar strips (CPS) have the advantage of higher level of integration and a balanced structure that have favorable features for integrated voltage controlled oscillators and low noise and power amplifiers. Based on split ring resonator's (SRRs) rejection and phase shift properties around their resonance, a high quality factor composite right/left handed (CRLH) coplanar strips resonator is designed to operate in mm-wave regime at 60 GHz. Using this structure, a 52% improvement is achieved in comparison with an optimized conventional CPS resonator designed in a 90 nm CMOS process.
{"title":"High quality factor mm-wave coplanar strip resonator based on split ring resonators","authors":"A. K. Horestani, Z. Shaterian, S. Al-Sarawi, D. Abbott","doi":"10.1109/IRMMW-THZ.2011.6105225","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105225","url":null,"abstract":"Coplanar strips (CPS) have the advantage of higher level of integration and a balanced structure that have favorable features for integrated voltage controlled oscillators and low noise and power amplifiers. Based on split ring resonator's (SRRs) rejection and phase shift properties around their resonance, a high quality factor composite right/left handed (CRLH) coplanar strips resonator is designed to operate in mm-wave regime at 60 GHz. Using this structure, a 52% improvement is achieved in comparison with an optimized conventional CPS resonator designed in a 90 nm CMOS process.","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":"74563005","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.2011.6105252
Bediha Besar, K. Woods
Experimental THz experiments on hen egg-white lysozyme (HEWL) with and without the ligand NAG3 has revealed that the protein's solvent structure on the picosecond time scale is in integral part of the regulation mechanism of the enzyme. Our investigation into the low frequency dynamics of the protein has uncovered that the counterions in the solvent shell mediate the collective dynamics of both the water and the protein in the system. As a result, we find that the lysozyme fast dynamics is strongly influenced by fast water (H — bonding) dynamics. Both the activity and structure of the water change with addition of the ligand. Perhaps most intriguing is that we find that the long range correlation between distant parts of protein are broken with the addition of the inhibitor; which coincides with the disruption of energy dispersion in the solvent hydrogen bonding network.
{"title":"Picosecond time scale solvent fluctuations and enzymatic regulation in hen egg white lysozyme ligand reactions","authors":"Bediha Besar, K. Woods","doi":"10.1109/IRMMW-THZ.2011.6105252","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105252","url":null,"abstract":"Experimental THz experiments on hen egg-white lysozyme (HEWL) with and without the ligand NAG3 has revealed that the protein's solvent structure on the picosecond time scale is in integral part of the regulation mechanism of the enzyme. Our investigation into the low frequency dynamics of the protein has uncovered that the counterions in the solvent shell mediate the collective dynamics of both the water and the protein in the system. As a result, we find that the lysozyme fast dynamics is strongly influenced by fast water (H — bonding) dynamics. Both the activity and structure of the water change with addition of the ligand. Perhaps most intriguing is that we find that the long range correlation between distant parts of protein are broken with the addition of the inhibitor; which coincides with the disruption of energy dispersion in the solvent hydrogen bonding network.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"43 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":"84719186","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.2011.6105050
C. Berry, M. Jarrahi
We present an ultrafast photoconductor that offers significantly higher quantum efficiencies compared to conventional photoconductors. The ultrafast response is achieved by excitation of surface plasmon waves, localizing a major portion of the incident light near photoconductor contact electrodes.
{"title":"Ultrafast photoconductors based on plasmonic gratings","authors":"C. Berry, M. Jarrahi","doi":"10.1109/IRMMW-THZ.2011.6105050","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2011.6105050","url":null,"abstract":"We present an ultrafast photoconductor that offers significantly higher quantum efficiencies compared to conventional photoconductors. The ultrafast response is achieved by excitation of surface plasmon waves, localizing a major portion of the incident light near photoconductor contact electrodes.","PeriodicalId":6353,"journal":{"name":"2011 International Conference on Infrared, Millimeter, and Terahertz Waves","volume":"55 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":"84782631","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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