Pub Date : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327797
S. Fernandez-Gutierrez, Dennis R. Gautreau, J. Sirigiri, B. Popovic, D. Gamzina, N. Luhmann
Summary form only given. We present the circuit design of a 263 GHz Traveling Wave Tube (TWT) amplifier for use in Dynamic Nuclear Polarization (DNP) enhanced Nuclear Magnetic Resonance (NMR). The circuit design achieves a linear gain of 36 dB and output power > 50 W. This work describes the design of the interaction circuit for optimal interaction with a 20 kV, 125 mA elliptical beam using 3D electromagnetic Finite Element Method (FEM) and Particle-in-Cell (PIC) solvers.
{"title":"263 GHz Traveling Wave Tube (TWT) amplifier for Dynamic Nuclear Polarization (DNP) and Electron Paramagnetic Resonance (EPR) spectroscopy","authors":"S. Fernandez-Gutierrez, Dennis R. Gautreau, J. Sirigiri, B. Popovic, D. Gamzina, N. Luhmann","doi":"10.1109/IRMMW-THZ.2015.7327797","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327797","url":null,"abstract":"Summary form only given. We present the circuit design of a 263 GHz Traveling Wave Tube (TWT) amplifier for use in Dynamic Nuclear Polarization (DNP) enhanced Nuclear Magnetic Resonance (NMR). The circuit design achieves a linear gain of 36 dB and output power > 50 W. This work describes the design of the interaction circuit for optimal interaction with a 20 kV, 125 mA elliptical beam using 3D electromagnetic Finite Element Method (FEM) and Particle-in-Cell (PIC) solvers.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"84 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81123874","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327597
M. Šindler, C. Kadlec, H. Němec, F. Dominec, P. Kužel, C. Elissalde, U. Chung, P. Mounaix
TiO2 microspheres embedded in a dielectric layer were investigated both experimentally using time domain terahertz (THz) spectroscopy, and theoretically by finite-difference time-domain method. We focus on the role of the permittivity of the embedding medium. We find that media with sufficiently low permittivities do not significantly affect the effective response of the microspheres, which is a prerequisite for the fabrication of durable metamaterials with fixed spatial distribution of the components.
{"title":"THz response of TiO2 microspheres embedded in a dielectric layer","authors":"M. Šindler, C. Kadlec, H. Němec, F. Dominec, P. Kužel, C. Elissalde, U. Chung, P. Mounaix","doi":"10.1109/IRMMW-THZ.2015.7327597","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327597","url":null,"abstract":"TiO2 microspheres embedded in a dielectric layer were investigated both experimentally using time domain terahertz (THz) spectroscopy, and theoretically by finite-difference time-domain method. We focus on the role of the permittivity of the embedding medium. We find that media with sufficiently low permittivities do not significantly affect the effective response of the microspheres, which is a prerequisite for the fabrication of durable metamaterials with fixed spatial distribution of the components.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86543303","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327890
Ľ. Bača, M. Janek, Z. Kováčová, J. Molloy, M. Naftaly
CaZrO3 doped samples were prepared by using the solution combustion method. The higher powder sintering temperature induced slightly higher crystallinity in the studied samples with higher refractive indexes found. The differences in the dielectric behaviour and electronic conductivity of the samples may be attributed to the improved crystals order. However, a more detailed investigation of these materials is required.
{"title":"Dielectric properties of CaZrO3 investigated by THz-TDS","authors":"Ľ. Bača, M. Janek, Z. Kováčová, J. Molloy, M. Naftaly","doi":"10.1109/IRMMW-THZ.2015.7327890","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327890","url":null,"abstract":"CaZrO3 doped samples were prepared by using the solution combustion method. The higher powder sintering temperature induced slightly higher crystallinity in the studied samples with higher refractive indexes found. The differences in the dielectric behaviour and electronic conductivity of the samples may be attributed to the improved crystals order. However, a more detailed investigation of these materials is required.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"55 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85734799","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327798
Hironori Sakamoto, B. Ma, K. Morita, Y. Ishitani
Quantum interference between two LO phonon modes and valence band states is investigated by Raman spectra of p-type Ga0.5In0.5P. The spectrum fitting analysis reveals the quantum interference features in asymmetric line shape, broadening, and peak shift. This finding suggests the possibility of the control of the absorption profile in THz frequency region.
{"title":"Interference of 2 LO phonon and continuum inter-valence band transition in p-GaInP film","authors":"Hironori Sakamoto, B. Ma, K. Morita, Y. Ishitani","doi":"10.1109/IRMMW-THZ.2015.7327798","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327798","url":null,"abstract":"Quantum interference between two LO phonon modes and valence band states is investigated by Raman spectra of p-type Ga0.5In0.5P. The spectrum fitting analysis reveals the quantum interference features in asymmetric line shape, broadening, and peak shift. This finding suggests the possibility of the control of the absorption profile in THz frequency region.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87390492","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327664
E. Constable, A. Squires, K. Rule, R. Lewis
This work presents far-infrared transmission spectroscopy on single crystal PbCuSO4(OH)2 using synchrotron radiation. The study covers the spectral region 150-400 cm-1 with electric field polarisation parallel to either the a or b crystal directions. The results reveal a number of anisotropic absorption features tentatively attributed to phonon modes.
{"title":"Far-infrared spectroscopy of quantum spin chain: PbCuSO4(OH)2","authors":"E. Constable, A. Squires, K. Rule, R. Lewis","doi":"10.1109/IRMMW-THZ.2015.7327664","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327664","url":null,"abstract":"This work presents far-infrared transmission spectroscopy on single crystal PbCuSO4(OH)2 using synchrotron radiation. The study covers the spectral region 150-400 cm-1 with electric field polarisation parallel to either the a or b crystal directions. The results reveal a number of anisotropic absorption features tentatively attributed to phonon modes.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"5 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89981470","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327887
M. Havenith
Summary form only given. Terahertz (THz) absorption spectroscopy is a powerful tool to study (bio)molecular hydration. The development of THz technology helped to full the experimental gap in this frequency range. These experimental advances had to go hand in hand with the development of theoretical concepts that have been developed in the recent years to describe the underlying solute-induced sub-picosecond dynamics of the hydration shell. This frequency range covers the so-called rattling modes of the ion with its hydration cage and allows to derive major conclusions on the molecular picture of ion hydration, a key issue in chemistry. THz spectroscopy allows the quantification of the hydration shell around ions, and the characterization ion pairs. By a combination of experiment and theory, it is now possible to rigorously dissect the THz spectrum of a solvated biomolecule into the distinct solute, solvent and solute-solvent coupled contributions. Moreover, we highlight recent results that show the significance of hydrogen bond dynamics for molecular recognition. In all of these examples, a gradient of water motion toward functional sites of proteins is observed, the so-called “hydration funnel”.
{"title":"It is water what matters: THz absorption spectroscopy as a new tool to study solvation dynamics","authors":"M. Havenith","doi":"10.1109/IRMMW-THZ.2015.7327887","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327887","url":null,"abstract":"Summary form only given. Terahertz (THz) absorption spectroscopy is a powerful tool to study (bio)molecular hydration. The development of THz technology helped to full the experimental gap in this frequency range. These experimental advances had to go hand in hand with the development of theoretical concepts that have been developed in the recent years to describe the underlying solute-induced sub-picosecond dynamics of the hydration shell. This frequency range covers the so-called rattling modes of the ion with its hydration cage and allows to derive major conclusions on the molecular picture of ion hydration, a key issue in chemistry. THz spectroscopy allows the quantification of the hydration shell around ions, and the characterization ion pairs. By a combination of experiment and theory, it is now possible to rigorously dissect the THz spectrum of a solvated biomolecule into the distinct solute, solvent and solute-solvent coupled contributions. Moreover, we highlight recent results that show the significance of hydrogen bond dynamics for molecular recognition. In all of these examples, a gradient of water motion toward functional sites of proteins is observed, the so-called “hydration funnel”.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"14 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84493825","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327689
B. Bulcha, J. Hesler, A. Valavanis, V. Drakinskiy, J. Stake, R. Dong, Jingxuan Zhu, P. Dean, Lianhe H. Li, A. Davies, E. Linfield, N. S. Barker
The frequency of a 2.5 THz QCL are stabilized to sub-hertz accuracy by phase-locking to a stable 100 MHz microwave reference, using a 2.3-3.2 THz room temperature Schottky diode based harmonic mixer. The down-converted phase locked beat note is stable over a long term test.
{"title":"Phase locking of a 2.5 THz quantum cascade laser to a microwave reference using THz Schottky mixer","authors":"B. Bulcha, J. Hesler, A. Valavanis, V. Drakinskiy, J. Stake, R. Dong, Jingxuan Zhu, P. Dean, Lianhe H. Li, A. Davies, E. Linfield, N. S. Barker","doi":"10.1109/IRMMW-THZ.2015.7327689","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327689","url":null,"abstract":"The frequency of a 2.5 THz QCL are stabilized to sub-hertz accuracy by phase-locking to a stable 100 MHz microwave reference, using a 2.3-3.2 THz room temperature Schottky diode based harmonic mixer. The down-converted phase locked beat note is stable over a long term test.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"2 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82960856","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327755
O. Haenssler, S. Fatikow
Combining Scanning Electron Microscopy (SEM) and Microwave Microscopy is resulting in a hybrid microscope with multi-sensorial features. Parallelized measurements in the micro- and mm-wave region and manipulation of micro- and nano-scaled objects will be possible. Nanorobotic positioning stages with end-effectors inside the vacuum chamber of this microscope are controlled by an open-source automation software framework which also obtained live data and images of a Vector Network Analyzer (VNA) and the SEM.
{"title":"Manipulating and characterizing with nanorobotics: In-situ SEM technique for centimeter and millimeter waves","authors":"O. Haenssler, S. Fatikow","doi":"10.1109/IRMMW-THZ.2015.7327755","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327755","url":null,"abstract":"Combining Scanning Electron Microscopy (SEM) and Microwave Microscopy is resulting in a hybrid microscope with multi-sensorial features. Parallelized measurements in the micro- and mm-wave region and manipulation of micro- and nano-scaled objects will be possible. Nanorobotic positioning stages with end-effectors inside the vacuum chamber of this microscope are controlled by an open-source automation software framework which also obtained live data and images of a Vector Network Analyzer (VNA) and the SEM.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"49 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83986738","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327545
L. Ding, W. Lu
Meteorological satellites have become an irreplaceable weather and ocean observing tool. Since the first Chinese polar-orbiting meteorological satellite Feng-Yun (FY-1A) was launched successfully in 1988, there are totally 13 meteorological satellites that were launched into both sun synchronous and geostationary orbit. China is among the few countries in the world which are simultaneously operating both orbiting meteorological satellites. All the satellites have been incorporated into the global constellations of operational meteorological satellites within the WMO framework. More satellites are under construction to be the second generation ones. The status of Chinese meteorological satellite mission is introduced in this paper.
{"title":"The development of infrared remote sensors for Chinese meteorological satellites","authors":"L. Ding, W. Lu","doi":"10.1109/IRMMW-THZ.2015.7327545","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327545","url":null,"abstract":"Meteorological satellites have become an irreplaceable weather and ocean observing tool. Since the first Chinese polar-orbiting meteorological satellite Feng-Yun (FY-1A) was launched successfully in 1988, there are totally 13 meteorological satellites that were launched into both sun synchronous and geostationary orbit. China is among the few countries in the world which are simultaneously operating both orbiting meteorological satellites. All the satellites have been incorporated into the global constellations of operational meteorological satellites within the WMO framework. More satellites are under construction to be the second generation ones. The status of Chinese meteorological satellite mission is introduced in this paper.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"47 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81853010","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327853
Lei Du, Gang Chen, Lin Wang, Xiaoshuang Chen, W. Lu
The plasmon resonances in graphene and graphene field effect transistors (GFETs) are investigated by electromagnetic simulations of the behavior of photo-generated carriers with applied bias voltage. Our results show a strong absorption in THz regime in patterned graphene field effect transistor, offering a perspective application in far-infrared photodetectors.
{"title":"Plasmon resonances of terahertz absorption in nano-patterned graphene","authors":"Lei Du, Gang Chen, Lin Wang, Xiaoshuang Chen, W. Lu","doi":"10.1109/IRMMW-THZ.2015.7327853","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327853","url":null,"abstract":"The plasmon resonances in graphene and graphene field effect transistors (GFETs) are investigated by electromagnetic simulations of the behavior of photo-generated carriers with applied bias voltage. Our results show a strong absorption in THz regime in patterned graphene field effect transistor, offering a perspective application in far-infrared photodetectors.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"13 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81959776","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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