Pub Date : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510199
Qiwu Shi, Wanxia Huang
A- Ti3O5exhibits intriguing phase transition between λ, ß and $a$ phase, which has great application potential in tunable optoelectronic devices. However, the fabrication of λ- Ti3O5still presents great challenge and its application in THz range has been rarely reported so far. Our work developed two strategies to fabricate λ-Ti3O5and investigated its phase transition properties in THz range. It indicated that the λ-Ti3O5exhibited temperature induced semimetal-metal phase transition and laser induced semimetal-semiconductor phase transition characteristics, which can be used in dynamic controlling of THz wave transmission.
A- ti3o5在λ， β和$ A $相之间表现出有趣的相变，在可调谐光电器件中具有很大的应用潜力。然而，λ- ti3o5的制备仍然面临着很大的挑战，其在太赫兹范围内的应用目前还很少报道。我们的工作开发了两种制备λ- ti3o5的策略，并研究了其在太赫兹范围内的相变特性。结果表明，λ- ti3o5具有温度诱导半金属-金属相变和激光诱导半金属-半导体相变的特性，可用于太赫兹波传输的动态控制。
{"title":"λ-Ti3O5with Temperature and Laser Induced Phase Transition Characteristics for Active Tuning of Terahertz Wave Transmission","authors":"Qiwu Shi, Wanxia Huang","doi":"10.1109/IRMMW-THZ.2018.8510199","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510199","url":null,"abstract":"A- Ti<inf>3</inf>O<inf>5</inf>exhibits intriguing phase transition between λ, ß and <tex>$a$</tex> phase, which has great application potential in tunable optoelectronic devices. However, the fabrication of λ- Ti<inf>3</inf>O<inf>5</inf>still presents great challenge and its application in THz range has been rarely reported so far. Our work developed two strategies to fabricate λ-Ti<inf>3</inf>O<inf>5</inf>and investigated its phase transition properties in THz range. It indicated that the λ-Ti<inf>3</inf>O<inf>5</inf>exhibited temperature induced semimetal-metal phase transition and laser induced semimetal-semiconductor phase transition characteristics, which can be used in dynamic controlling of THz wave transmission.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"320 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75228281","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510098
V. Manuilov, V. Zaslavsky, I. Zotova, T. Idehara, M. Glyavin
In this paper, the theoretical consideration of possibilities of two-stage energy recovery systems in double beam gyrotron is presented. Specific features of energy spectra for two beams after the interaction with RF field are discussed. As an example the double beam 0.79 THz CW gyrotron is considered. The mentioned tube is planned to be used as a powerful radiation source for a high-field DNP-NMR spectroscopy.
{"title":"Two-Stage Energy Recovery System for THz band Double-Beam Gyrotron","authors":"V. Manuilov, V. Zaslavsky, I. Zotova, T. Idehara, M. Glyavin","doi":"10.1109/IRMMW-THZ.2018.8510098","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510098","url":null,"abstract":"In this paper, the theoretical consideration of possibilities of two-stage energy recovery systems in double beam gyrotron is presented. Specific features of energy spectra for two beams after the interaction with RF field are discussed. As an example the double beam 0.79 THz CW gyrotron is considered. The mentioned tube is planned to be used as a powerful radiation source for a high-field DNP-NMR spectroscopy.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"42 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75801109","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510347
Yunzhuo Guo, K. Murate, Kazuki Maeda, K. Kawase
In this research, we demonstrated a high-gain terahertz(THz) parametric amplifier for an extremely weak THz-wave of low frequency (963 GHz). The amplification factor reached more than 94 dB by dividing the amplifier into two parts: the pre-amplifier and the main-amplifier.
{"title":"Terahertz wave Parametric Amplifier with an Amplification Factor of Two Billion","authors":"Yunzhuo Guo, K. Murate, Kazuki Maeda, K. Kawase","doi":"10.1109/IRMMW-THZ.2018.8510347","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510347","url":null,"abstract":"In this research, we demonstrated a high-gain terahertz(THz) parametric amplifier for an extremely weak THz-wave of low frequency (963 GHz). The amplification factor reached more than 94 dB by dividing the amplifier into two parts: the pre-amplifier and the main-amplifier.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"21 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75805644","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510396
G. Rana, Abhishek Gupta, A. Bhattacharya, Ravikumar Jain, S. Duttagupta, S. Prabhu
In this article we have investigated the effect of surface nano-patterns in THz Photo-Conductive Antennae (PCA). The surface patterns help to localize the incident IR excitation thus reduces the reflection. It also reduces carrier recombination time by introducing defect states in current path. The combined effect enhances the THz emission from the device up to 220% when the electrical bias field is parallel to the optical pump polarization.
{"title":"Enhancing the THz emission through surface patterning in Photo-Conductive Antenna","authors":"G. Rana, Abhishek Gupta, A. Bhattacharya, Ravikumar Jain, S. Duttagupta, S. Prabhu","doi":"10.1109/IRMMW-THZ.2018.8510396","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510396","url":null,"abstract":"In this article we have investigated the effect of surface nano-patterns in THz Photo-Conductive Antennae (PCA). The surface patterns help to localize the incident IR excitation thus reduces the reflection. It also reduces carrier recombination time by introducing defect states in current path. The combined effect enhances the THz emission from the device up to 220% when the electrical bias field is parallel to the optical pump polarization.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"48 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73206468","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8509902
Yang Gao, Deyin Kong, Bo Wang, Xiaojun Wu, T. Nie, Li Wang, C. Ruan, Weisheng Zhao, J. Miao
Approaches towards highly-efficient generation of controllable ellipitical terahertz pulses in ferromagnetic nano-heterostructures are demonstrated. The mechanism for the coherent control of femtosecond spin current in ferromagnetic heterostructures are discussed.
{"title":"Coherent control of femtosecond spin current investigated by polarization dependent terahertz emission spectroscopy in ferromagnetic heterostructures","authors":"Yang Gao, Deyin Kong, Bo Wang, Xiaojun Wu, T. Nie, Li Wang, C. Ruan, Weisheng Zhao, J. Miao","doi":"10.1109/IRMMW-THZ.2018.8509902","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8509902","url":null,"abstract":"Approaches towards highly-efficient generation of controllable ellipitical terahertz pulses in ferromagnetic nano-heterostructures are demonstrated. The mechanism for the coherent control of femtosecond spin current in ferromagnetic heterostructures are discussed.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"17 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73331960","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510328
M. Rosay, Ivan Scrgeyev, L. Tometich, Christopher Hickey, A. Roitman, D. Yake, D. Berry
Modern Dynamic Nuclear Polarization (DNP) experiments often utilize gyrotron sources for irradiation of electron spins at 140–593 GHz. The total cost of ownership, size, and complexity of gyrotrons, however, limits wider adoption. The introduction of lower-cost and more compact sources can have a significant impact on the DNP community. This contribution describes the development of a 263 GHz EIK, design of transmission line for optimal irradiation of the DNP NMR sample, and detailed performance characterization for DNP experiments.
{"title":"Opportunities and Challenges for EIK's in DNP NMR Applications","authors":"M. Rosay, Ivan Scrgeyev, L. Tometich, Christopher Hickey, A. Roitman, D. Yake, D. Berry","doi":"10.1109/IRMMW-THZ.2018.8510328","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510328","url":null,"abstract":"Modern Dynamic Nuclear Polarization (DNP) experiments often utilize gyrotron sources for irradiation of electron spins at 140–593 GHz. The total cost of ownership, size, and complexity of gyrotrons, however, limits wider adoption. The introduction of lower-cost and more compact sources can have a significant impact on the DNP community. This contribution describes the development of a 263 GHz EIK, design of transmission line for optimal irradiation of the DNP NMR sample, and detailed performance characterization for DNP experiments.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"24 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75338389","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510358
G. Scalari, A. Forrer, T. Olariu, D. Stark, M. Beck, J. Faist
Recently, on-chip quantum-cascade-Iaser-based frequency combs are gaining increasing attention both in the Mid-IR and in the THz spectral regions. THz devices offer the possibility of filling the gap of comb sources in a spectral region were no table top comb is available. We will report on recent progresses including broadband (>1 THz) comb generation, dual color comb source operating as combs and spaced by exactly one octave in frequency and new homogenous laser design with ultra broad bandwidth.
{"title":"Broadband On-Chip Thz Frequency Combs","authors":"G. Scalari, A. Forrer, T. Olariu, D. Stark, M. Beck, J. Faist","doi":"10.1109/IRMMW-THZ.2018.8510358","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510358","url":null,"abstract":"Recently, on-chip quantum-cascade-Iaser-based frequency combs are gaining increasing attention both in the Mid-IR and in the THz spectral regions. THz devices offer the possibility of filling the gap of comb sources in a spectral region were no table top comb is available. We will report on recent progresses including broadband (>1 THz) comb generation, dual color comb source operating as combs and spaced by exactly one octave in frequency and new homogenous laser design with ultra broad bandwidth.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"139 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73951380","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510405
F. Sanjuan, G. Gaborit, J. Coutaz
We report on an unexpected anisotropy of THz generation by optical rectification in <111> ZnTe crystal, which is due to the anisotropy of THz absorption by free carriers excited through two-photon absorption of the pump laser beam.
{"title":"Influence of Two-Photon Absorption Anisotropy on Terahertz Generation in < 111 > Zinc Blende Crystals","authors":"F. Sanjuan, G. Gaborit, J. Coutaz","doi":"10.1109/IRMMW-THZ.2018.8510405","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510405","url":null,"abstract":"We report on an unexpected anisotropy of THz generation by optical rectification in <111> ZnTe crystal, which is due to the anisotropy of THz absorption by free carriers excited through two-photon absorption of the pump laser beam.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"AES-8 4","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72603150","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8509846
M. Lo, Alberto Zarzuelo, R. Guzman, H. Lamela, G. Carpintero
We present two different types of integrated optical frequency comb structures, based on mode-locked lasers, fabricated on an indium phosphide generic technology platform. The structures present the particular feature that do not require cleaved facets, enabled by on-chip mirrors. The presented comb structures feature wide spectral bandwidth and mode spacing selectability.
{"title":"Versatile Photonic Integrated Optical Frequency Combs Generators for Millimeter-Wave Generation","authors":"M. Lo, Alberto Zarzuelo, R. Guzman, H. Lamela, G. Carpintero","doi":"10.1109/IRMMW-THZ.2018.8509846","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8509846","url":null,"abstract":"We present two different types of integrated optical frequency comb structures, based on mode-locked lasers, fabricated on an indium phosphide generic technology platform. The structures present the particular feature that do not require cleaved facets, enabled by on-chip mirrors. The presented comb structures feature wide spectral bandwidth and mode spacing selectability.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"64 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74416397","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510000
L. Alyabyeva, V. Torgashev, E. Zhukova, D. Vinnik, A. Prokhorov, S. Gudkova, David Rivas Góngora, T. Ivek, S. Tomić, N. Novosel, D. Starešinić, D. Dominko, Z. Jagličić, M. Dressel, B. Gorshunov
Single crystalline lead-substituted barium hexaferrite compounds are studied in a broad spectral range, 102 Hz to 2*1014 Hz. We observe excitations of different nature including dielectric and magnetic relaxations coexisting within the same frequency and temperature ranges and electronic transitions between the fine-structure components of the split Fe2+ ground state level.
{"title":"Bi-relaxor behavior and Fe2+fine structure in single crystalline Ba0.3Pb0.7Fe12O19M-type hexaferrite","authors":"L. Alyabyeva, V. Torgashev, E. Zhukova, D. Vinnik, A. Prokhorov, S. Gudkova, David Rivas Góngora, T. Ivek, S. Tomić, N. Novosel, D. Starešinić, D. Dominko, Z. Jagličić, M. Dressel, B. Gorshunov","doi":"10.1109/IRMMW-THZ.2018.8510000","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510000","url":null,"abstract":"Single crystalline lead-substituted barium hexaferrite compounds are studied in a broad spectral range, 102 Hz to 2*1014 Hz. We observe excitations of different nature including dielectric and magnetic relaxations coexisting within the same frequency and temperature ranges and electronic transitions between the fine-structure components of the split Fe2+ ground state level.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"60 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78667134","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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