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.2015.7327647
T. Kurabayashi, Takuya Inoue, Haruka Iguchi, S. Yodokawa, Takeshi Ando, S. Kosaka
Absorption spectra of cellulosic fibers in THz region show discriminative absorptions which are derived from crystallized cellulose, when we prepare the samples by cutting at a length of about 0.1-0.2 mm. The blending ratio of two different kinds of fibers has been examined by using this method, and the spectra were analyzed by an analysis of principal component as a multiple classification analysis after the first derivation of the spectra. The result means the blending ratio can be identified with considerable accuracy at a few percent of reliability.
{"title":"Identification of fabric fibers and their blending ratio by terahertz spectroscopy","authors":"T. Kurabayashi, Takuya Inoue, Haruka Iguchi, S. Yodokawa, Takeshi Ando, S. Kosaka","doi":"10.1109/IRMMW-THZ.2015.7327647","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327647","url":null,"abstract":"Absorption spectra of cellulosic fibers in THz region show discriminative absorptions which are derived from crystallized cellulose, when we prepare the samples by cutting at a length of about 0.1-0.2 mm. The blending ratio of two different kinds of fibers has been examined by using this method, and the spectra were analyzed by an analysis of principal component as a multiple classification analysis after the first derivation of the spectra. The result means the blending ratio can be identified with considerable accuracy at a few percent of reliability.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"115 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":"85393610","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.2015.7327612
F. Kadlec, C. Kadlec, J. Buršík, J. Vít, V. Goian, J. Prokleška, M. Kempa, F. Borodavka, S. Rols, S. Kamba
THz, infrared and inelastic neutron scattering spectra of Z-hexaferrite ceramics were measured in a broad range of temperatures. A sharp electromagnon is observed near 1THz, vanishing with increasing magnetic field until a phase transition occurs at H ≈ 2T. Then, another strong peak whose resonance frequency is linearly proportional to the magnetic field turns up from the sub-THz range. We assign this peak to a ferrimagnetic resonance.
{"title":"Spin and lattice excitations of multiferroic (Ba0.2Sr0.8)3Co2Fe24O41 in the THz range","authors":"F. Kadlec, C. Kadlec, J. Buršík, J. Vít, V. Goian, J. Prokleška, M. Kempa, F. Borodavka, S. Rols, S. Kamba","doi":"10.1109/IRMMW-THZ.2015.7327612","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327612","url":null,"abstract":"THz, infrared and inelastic neutron scattering spectra of Z-hexaferrite ceramics were measured in a broad range of temperatures. A sharp electromagnon is observed near 1THz, vanishing with increasing magnetic field until a phase transition occurs at H ≈ 2T. Then, another strong peak whose resonance frequency is linearly proportional to the magnetic field turns up from the sub-THz range. We assign this peak to a ferrimagnetic resonance.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"101 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":"80436669","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.2015.7327664
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.2015.7327482
S. Nadri, Linli Xie, Naser Alijabbari, J. Gaskins, B. Foley, P. Hopkins, R. Weikle
This work reports on a steady-state thermal analysis of a 160 GHz balanced quadrupler, based on a quasi-vertical varactor Schottky diode process, for high power applications. The chip is analyzed by solving the heat equation via the 3D finite element method. Time-Domain Thermoreflectance (TDTR) was used to measure the thermal conductivity of the different materials used in the model. A maximum anode temperature of 64.9°C was found from the simulation. The addition of an extra beam lead connected to the block, for heat sinking, was found to reduce this maximum temperature to 41.0°C.
{"title":"Steady-state thermal analysis of an integrated 160 GHz balanced quadrupler based on quasi-vertical Schottky diodes","authors":"S. Nadri, Linli Xie, Naser Alijabbari, J. Gaskins, B. Foley, P. Hopkins, R. Weikle","doi":"10.1109/IRMMW-THz.2015.7327482","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2015.7327482","url":null,"abstract":"This work reports on a steady-state thermal analysis of a 160 GHz balanced quadrupler, based on a quasi-vertical varactor Schottky diode process, for high power applications. The chip is analyzed by solving the heat equation via the 3D finite element method. Time-Domain Thermoreflectance (TDTR) was used to measure the thermal conductivity of the different materials used in the model. A maximum anode temperature of 64.9°C was found from the simulation. The addition of an extra beam lead connected to the block, for heat sinking, was found to reduce this maximum temperature to 41.0°C.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"101 11 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":"83333674","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.2015.7327797
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.2015.7327545
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}
Pub Date : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327835
Xianbin Yu, B. Vidal, M. Galili, T. Morioka, P. Jepsen, L. Oxenløwe
We experimentally characterize a ultrabroadband terahertz (THz) impulse radio system with up to 10 GHz repetition rate. THz generation and radiation are realized in an antenna-integrated uni-traveling-carrier photodiode (UTC-PD), and THz reception is implemented based on photoconductive sampling by using a photoconductive antenna (PCA). We analyze the performance in terms of bandwidth and the features of the THz pulses. A 15 dB bandwidth of 1 THz confirms that this THz impulse system has a great potential of supporting ultrafast data rates, eventually for Terabit wireless communication era.
{"title":"Experimental characterization of extremely broadband THz impulse radio communication systems","authors":"Xianbin Yu, B. Vidal, M. Galili, T. Morioka, P. Jepsen, L. Oxenløwe","doi":"10.1109/IRMMW-THZ.2015.7327835","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327835","url":null,"abstract":"We experimentally characterize a ultrabroadband terahertz (THz) impulse radio system with up to 10 GHz repetition rate. THz generation and radiation are realized in an antenna-integrated uni-traveling-carrier photodiode (UTC-PD), and THz reception is implemented based on photoconductive sampling by using a photoconductive antenna (PCA). We analyze the performance in terms of bandwidth and the features of the THz pulses. A 15 dB bandwidth of 1 THz confirms that this THz impulse system has a great potential of supporting ultrafast data rates, eventually for Terabit wireless communication era.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"20 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":"78860471","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：