Pub Date : 2019-09-01DOI: 10.1109/IRMMW-THz.2019.8874182
M. Chung
A 33~50 GHz dual-circular polarizer combining of an OMT(Orthomode Transducer) and a 90-deg differential phase shifter has been developed for Korean VLBI Network. The OMT is based on curved double-ridge structure and the phase shifter is designed using quad-ridge waveguide. The bandwidth of the designed circular polarizer is around 41 %.
{"title":"A Broadband Q-band Dual-Circular Polarizer for Millimeter-Wave VLBI Observations","authors":"M. Chung","doi":"10.1109/IRMMW-THz.2019.8874182","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8874182","url":null,"abstract":"A 33~50 GHz dual-circular polarizer combining of an OMT(Orthomode Transducer) and a 90-deg differential phase shifter has been developed for Korean VLBI Network. The OMT is based on curved double-ridge structure and the phase shifter is designed using quad-ridge waveguide. The bandwidth of the designed circular polarizer is around 41 %.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"36 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88806568","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 : 2019-09-01DOI: 10.1109/IRMMW-THz.2019.8873825
K. Fukunaga, Yoshimi Ueno, Yasunobu Ito
A masterpiece of Salvador Dalí was investigated by using Terahertz time-domain imaging. The experimental results confirmed its multilayered structure and suggested that Dalí did not cover the entire canvas because the number of painted layers depends on the area. The painting was supported with a lining layer and a metal plate added in previous intervention, and its structure was compared with that of another 20th century masterpiece painted by Pablo Picasso.
{"title":"Investigation of Multilayered 20th Century Painting by THz Imaging","authors":"K. Fukunaga, Yoshimi Ueno, Yasunobu Ito","doi":"10.1109/IRMMW-THz.2019.8873825","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8873825","url":null,"abstract":"A masterpiece of Salvador Dalí was investigated by using Terahertz time-domain imaging. The experimental results confirmed its multilayered structure and suggested that Dalí did not cover the entire canvas because the number of painted layers depends on the area. The painting was supported with a lining layer and a metal plate added in previous intervention, and its structure was compared with that of another 20th century masterpiece painted by Pablo Picasso.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"34 4","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91407112","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 : 2019-09-01DOI: 10.1109/IRMMW-THz.2019.8874136
D. Gomon, P. Demchenko, M. Khodzitsky
nowadays there is a strong necessity of cheap and compact THz components for various THz applications. Photonic crystals (PC) are perspective candidate for this role. In this work we show ability to manipulate broadening of PC band gap by superposition of two different PC lattices.
{"title":"THz dielectric photonic crystal with double lattice","authors":"D. Gomon, P. Demchenko, M. Khodzitsky","doi":"10.1109/IRMMW-THz.2019.8874136","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8874136","url":null,"abstract":"nowadays there is a strong necessity of cheap and compact THz components for various THz applications. Photonic crystals (PC) are perspective candidate for this role. In this work we show ability to manipulate broadening of PC band gap by superposition of two different PC lattices.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"53 2","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91434772","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 : 2019-09-01DOI: 10.1109/IRMMW-THz.2019.8874441
Aniela Dunn, C. Poyser, P. Dean, Aleksandar Demić, A. Valavanis, D. Indjin, M. Salih, I. Kundu, Lianhe H. Li, A. Akimov, G. Davies, E. Linfield, J. Cunningham, A. Kent
We demonstrate a new method for high-speed modulation of terahertz emission and electronic transport of a Ga(Al)As quantum cascade laser using coherent acoustic phonon pulses. The modulation, which is on the order of 6%, can be partially explained by a perturbation-theory analysis. The < 1 ns rise time of the modulation is dominated by parasitic device impedance in our experiment, however, the fast transit of phonons through the QCL heterostructure imply modulation rates > 100 GHz are possible.
{"title":"High-Speed Modulation of a Terahertz Quantum Cascade Laser Using Coherent Acoustic Phonon Pulses","authors":"Aniela Dunn, C. Poyser, P. Dean, Aleksandar Demić, A. Valavanis, D. Indjin, M. Salih, I. Kundu, Lianhe H. Li, A. Akimov, G. Davies, E. Linfield, J. Cunningham, A. Kent","doi":"10.1109/IRMMW-THz.2019.8874441","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8874441","url":null,"abstract":"We demonstrate a new method for high-speed modulation of terahertz emission and electronic transport of a Ga(Al)As quantum cascade laser using coherent acoustic phonon pulses. The modulation, which is on the order of 6%, can be partially explained by a perturbation-theory analysis. The < 1 ns rise time of the modulation is dominated by parasitic device impedance in our experiment, however, the fast transit of phonons through the QCL heterostructure imply modulation rates > 100 GHz are possible.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"39 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83134509","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 : 2019-09-01DOI: 10.1109/IRMMW-THz.2019.8874091
K. Kuznetsov, A. Leontyev, T. Novikova, A. A. Gaysarov, V. Sultanov, A. Rudyak, G. Kitaeva
We study the conditions necessary for generating non-classical optical-terahertz biphotons by means of spontaneous parametric down-conversion. Using a hot electron bolometer we demonstrate detection of the THz-frequency idler waves generated under parametric up- and down-conversion with a record low gain. Complete disappearance of the classical contribution has been observed at low temperatures. A second-order biphoton correlation function is analyzed.
{"title":"Preparation of the Quantum Correlated Optical-Terahertz Biphotons","authors":"K. Kuznetsov, A. Leontyev, T. Novikova, A. A. Gaysarov, V. Sultanov, A. Rudyak, G. Kitaeva","doi":"10.1109/IRMMW-THz.2019.8874091","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8874091","url":null,"abstract":"We study the conditions necessary for generating non-classical optical-terahertz biphotons by means of spontaneous parametric down-conversion. Using a hot electron bolometer we demonstrate detection of the THz-frequency idler waves generated under parametric up- and down-conversion with a record low gain. Complete disappearance of the classical contribution has been observed at low temperatures. A second-order biphoton correlation function is analyzed.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"52 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81024491","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 : 2019-09-01DOI: 10.1109/IRMMW-THz.2019.8874118
A. Bose, A. Kadu, H. Mansour, Pu (Perry) Wang, P. Boufounos, P. Orlik, M. Soltanalian
In this paper, we address the problem of mitigating nonlinear shadow effects in Terahertz time-domain spectroscopy (THz-TDS) multi-layer imaging. To that end, we utilize a one-dimensional (1D) nonlinear model to capture the interaction between the dielectric permittivity profile and the THz wavefield and recover the multi-layer structure by solving a 1D nonlinear inverse scattering via iterative and sequential optimization over frequencies. Numerical results confirm the effectiveness of the proposed method.
{"title":"THz Multi-Layer Imaging via Nonlinear Inverse Scattering","authors":"A. Bose, A. Kadu, H. Mansour, Pu (Perry) Wang, P. Boufounos, P. Orlik, M. Soltanalian","doi":"10.1109/IRMMW-THz.2019.8874118","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8874118","url":null,"abstract":"In this paper, we address the problem of mitigating nonlinear shadow effects in Terahertz time-domain spectroscopy (THz-TDS) multi-layer imaging. To that end, we utilize a one-dimensional (1D) nonlinear model to capture the interaction between the dielectric permittivity profile and the THz wavefield and recover the multi-layer structure by solving a 1D nonlinear inverse scattering via iterative and sequential optimization over frequencies. Numerical results confirm the effectiveness of the proposed method.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"25 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88573822","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 : 2019-09-01DOI: 10.1109/IRMMW-THz.2019.8873996
Kefei Wu, G. Ducournau, M. Hella
This paper presents a fully integrated 240 GHz plasma-wave Field Effect Transistor (FET) direct-detector receiver, implemented in 130 nm Silicon Germanium (SiGe) technology (fT/fmax = 210/250 GHz). The receiver chain is formed of an on-chip patch antenna, plasma-wave detector, and a broadband amplifier. The low modulation frequency characterization shows a responsivity of 15 V/W at 240 GHz, with a drain bias current of 2μ A. The responsivity is higher than 10 V/W from 225 GHz to 250 GHz. When measured with modulated signals at a carrier frequency of 240 GHz, the detected signal shows a clear eye diagram at a data rate up to 6 Gb/s with a bit error rate less than 10-5.
{"title":"A 240 GHz Receiver with 6 Gb/s Data Rate Based on Plasma Wave Detection in SiGe Technology","authors":"Kefei Wu, G. Ducournau, M. Hella","doi":"10.1109/IRMMW-THz.2019.8873996","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8873996","url":null,"abstract":"This paper presents a fully integrated 240 GHz plasma-wave Field Effect Transistor (FET) direct-detector receiver, implemented in 130 nm Silicon Germanium (SiGe) technology (fT/fmax = 210/250 GHz). The receiver chain is formed of an on-chip patch antenna, plasma-wave detector, and a broadband amplifier. The low modulation frequency characterization shows a responsivity of 15 V/W at 240 GHz, with a drain bias current of 2μ A. The responsivity is higher than 10 V/W from 225 GHz to 250 GHz. When measured with modulated signals at a carrier frequency of 240 GHz, the detected signal shows a clear eye diagram at a data rate up to 6 Gb/s with a bit error rate less than 10-5.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"39 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88653569","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 : 2019-09-01DOI: 10.1109/IRMMW-THz.2019.8874193
A. Vodopyanov, A. Sidorov, A. Veselov, V. Kubarev, O. Shevchenko, Y. Gorbachev
It is proposed to use high-power radiation from a terahertz free electron laser to create a localized (point-like) discharge in an inhomogeneous gas flow. Plasma parameters that can be achieved in such a system open up prospects for creating an effective point-like source of extreme ultraviolet light for the next-generation projection lithography.
{"title":"On the Prospects for the Study of a Point Discharge Sustained by a Terahertz Free Electron Laser Radiation in an Inhomogeneous Gas Flow","authors":"A. Vodopyanov, A. Sidorov, A. Veselov, V. Kubarev, O. Shevchenko, Y. Gorbachev","doi":"10.1109/IRMMW-THz.2019.8874193","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8874193","url":null,"abstract":"It is proposed to use high-power radiation from a terahertz free electron laser to create a localized (point-like) discharge in an inhomogeneous gas flow. Plasma parameters that can be achieved in such a system open up prospects for creating an effective point-like source of extreme ultraviolet light for the next-generation projection lithography.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"8 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84692725","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 : 2019-09-01DOI: 10.1109/IRMMW-THz.2019.8874469
J. R. Demers, E. Dale
A fringe-free, frequency domain terahertz spectrometer connected to a custom fabricated, light-weight multi-meter multi-pass sample cell was employed to measure the 1.492 THz, 1.507 THz and 1.523 THz molecular transitions of DHO over various pressures. We will report on the detectable concentrations of the DHO achieved with the portable instrument.
{"title":"Determining DHO detection limits for a frequency domain THz spectrometer coupled to a light-weight multi-pass sample cell","authors":"J. R. Demers, E. Dale","doi":"10.1109/IRMMW-THz.2019.8874469","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8874469","url":null,"abstract":"A fringe-free, frequency domain terahertz spectrometer connected to a custom fabricated, light-weight multi-meter multi-pass sample cell was employed to measure the 1.492 THz, 1.507 THz and 1.523 THz molecular transitions of DHO over various pressures. We will report on the detectable concentrations of the DHO achieved with the portable instrument.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"90 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86798040","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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