Pub Date : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370753
E. Nuttall, Y. Han, M. Horbury, N. Brewster, M. Oldfield, L. Li, A. Davies, E. Linfield, B. Ellison, P. Dean, D. Stone, J. H. Lehman, A. Valavanis
We demonstrate a terahertz gas spectroscopy technique based on self-mixing in a multimode quantum cascade laser (QCL). The spectral parameters of the H/D exchange reaction between water (H2O) and deuterated water (D2O) have been measured between 3.36-3.37 THz.
{"title":"Spectral analysis of a gas-phase reaction using self-mixing in a terahertz quantum cascade laser","authors":"E. Nuttall, Y. Han, M. Horbury, N. Brewster, M. Oldfield, L. Li, A. Davies, E. Linfield, B. Ellison, P. Dean, D. Stone, J. H. Lehman, A. Valavanis","doi":"10.1109/IRMMW-THz46771.2020.9370753","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370753","url":null,"abstract":"We demonstrate a terahertz gas spectroscopy technique based on self-mixing in a multimode quantum cascade laser (QCL). The spectral parameters of the H/D exchange reaction between water (H2O) and deuterated water (D2O) have been measured between 3.36-3.37 THz.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"58 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81233607","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370536
Tomotaka Hosotan, A. Satou, T. Otsuji
We report on terahertz (THz) emission from a current-driven asymmetric dual-grating-gate high-electron-mobility transistor (ADGG-HEMT) excited by photomixed dual-CW-infrared laser irradiation whose difference frequency $(delta f)$ was set around the THz plasmon-mode frequencies of the 2D electrons in the channel. The radiation spectra observed at 100 K showed two distinctive emission components beyond the black-body radiation, one promoted by $delta f$ independent thermally excited incoherent plasmons and the other promoted by $delta f$ dependent coherent plasmons. The results suggest the occurrence of the plasmonic instability stimulated by the dc current flow in the channel.
{"title":"Terahertz Emission in an Asymmetric Dual-Grating-Gate High-Electron Mobility Transistor Plasmonic Photomixer under dc Current Flow","authors":"Tomotaka Hosotan, A. Satou, T. Otsuji","doi":"10.1109/IRMMW-THz46771.2020.9370536","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370536","url":null,"abstract":"We report on terahertz (THz) emission from a current-driven asymmetric dual-grating-gate high-electron-mobility transistor (ADGG-HEMT) excited by photomixed dual-CW-infrared laser irradiation whose difference frequency $(delta f)$ was set around the THz plasmon-mode frequencies of the 2D electrons in the channel. The radiation spectra observed at 100 K showed two distinctive emission components beyond the black-body radiation, one promoted by $delta f$ independent thermally excited incoherent plasmons and the other promoted by $delta f$ dependent coherent plasmons. The results suggest the occurrence of the plasmonic instability stimulated by the dc current flow in the channel.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"12 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79868602","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370725
C. Pérez-Moreno, J. Grajal
We present the application of two electro-thermal models developed for Schottky diodes to the design of millimeterwave frequency multipliers. First, we use a physics-based numerical self-consistent electro-thermal model integrated into a harmonic-balance code to obtain the diode physical parameters that optimize the multiplier performance. Then, we employ an analytical self-consistent electro-thermal model implemented into commercial circuit design software to determine the complete multiplier layout that optimizes the overall performance. The design and test of a tripler circuit with output frequency in the 75–105 GHz band validates the proposed methodology.
{"title":"Application of Device Electro-Thermal Models to the Design of Millimeter-Wave Frequency Multipliers","authors":"C. Pérez-Moreno, J. Grajal","doi":"10.1109/IRMMW-THz46771.2020.9370725","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370725","url":null,"abstract":"We present the application of two electro-thermal models developed for Schottky diodes to the design of millimeterwave frequency multipliers. First, we use a physics-based numerical self-consistent electro-thermal model integrated into a harmonic-balance code to obtain the diode physical parameters that optimize the multiplier performance. Then, we employ an analytical self-consistent electro-thermal model implemented into commercial circuit design software to determine the complete multiplier layout that optimizes the overall performance. The design and test of a tripler circuit with output frequency in the 75–105 GHz band validates the proposed methodology.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"10 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81065077","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370904
N. Bagraev, L. Klyachkin, A. Malyarenko, B. A. Novikov, A. P. Presnukhina, A. S. Reukov, K. B. Taranets, V. Khromov
Highly effective treatment of patients with pulmonary pathologies, including pathology caused by a new type of coronavirus infection, is demonstrated, using terahertz (THz) irradiation from a silicon nanosandwich structure (SNS) that is caused by the quantum Faraday effect under the stabilized drain-source current conditions. It was shown that the early (on the first day) use of the THz irradiation made it possible to reduce the patient's stay in the intensive care unit as well as the duration of the patient's intubation and mechanical ventilation, to reduce the radiological and pharmacological load on the patient, and increase the chances of a favorable prognosis in patients with risk factors.
{"title":"Prospects for the use of silicon terahertz sources for the treatment of pulmonary pathologies and affections caused by COVID-19","authors":"N. Bagraev, L. Klyachkin, A. Malyarenko, B. A. Novikov, A. P. Presnukhina, A. S. Reukov, K. B. Taranets, V. Khromov","doi":"10.1109/IRMMW-THz46771.2020.9370904","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370904","url":null,"abstract":"Highly effective treatment of patients with pulmonary pathologies, including pathology caused by a new type of coronavirus infection, is demonstrated, using terahertz (THz) irradiation from a silicon nanosandwich structure (SNS) that is caused by the quantum Faraday effect under the stabilized drain-source current conditions. It was shown that the early (on the first day) use of the THz irradiation made it possible to reduce the patient's stay in the intensive care unit as well as the duration of the patient's intubation and mechanical ventilation, to reduce the radiological and pharmacological load on the patient, and increase the chances of a favorable prognosis in patients with risk factors.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"44 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74168572","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370372
Robin Zatta, V. Jagtap, J. Grzyb, U. Pfeiffer
This paper presents a CMOS camera-type THz compact antenna test range (CATR) to facilitate a convenient means to measure far-field radiation patterns of transmitters (TXs). For concept validation, we measured the far-field radiation pattern of a 26-dBi 0.852-THz standard gain horn antenna-type TX with known far-field characteristics with the THz CATR. With the help of geometrical multi-frame super-resolution imaging, the directivity determination accuracy achieved at a peak signal-to-noise ratio (PSNR) of 34.8 dB is 0.2 dB. Further, we investigated a THz continuous-wave (CW) photomixer TX with unknown far-field characteristics at 0.852 THz. It emits a higher-order mode far-field radiation pattern, and its directivity is 25.4 dBi, determined at a PSNR of 31.8 dB.
{"title":"CMOS Camera-Type THz Compact Antenna Test Range for Far-Field Radiation Pattern Analysis","authors":"Robin Zatta, V. Jagtap, J. Grzyb, U. Pfeiffer","doi":"10.1109/IRMMW-THz46771.2020.9370372","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370372","url":null,"abstract":"This paper presents a CMOS camera-type THz compact antenna test range (CATR) to facilitate a convenient means to measure far-field radiation patterns of transmitters (TXs). For concept validation, we measured the far-field radiation pattern of a 26-dBi 0.852-THz standard gain horn antenna-type TX with known far-field characteristics with the THz CATR. With the help of geometrical multi-frame super-resolution imaging, the directivity determination accuracy achieved at a peak signal-to-noise ratio (PSNR) of 34.8 dB is 0.2 dB. Further, we investigated a THz continuous-wave (CW) photomixer TX with unknown far-field characteristics at 0.852 THz. It emits a higher-order mode far-field radiation pattern, and its directivity is 25.4 dBi, determined at a PSNR of 31.8 dB.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"2004 1","pages":"01-02"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86261071","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370927
X. Liu, C. Geng, X. Guo, K. Kolpatzeck, L. Häring, J. Balzer, A. Czylwik
In this paper, we present the design of one-dimensional symmetric and paired $1times 2$ multi-mode interference (MMI) couplers at 140 GHz applying a modal propagation analysis together with electromagnetic simulation. The designed couplers are fabricated by 3D printing and are characterized by terahertz frequency-domain spectroscopy. The measured amplitude imbalances between the outputs of the couplers are as good as 0.32 dB.
{"title":"Design and Characterization of 3D Printed Polymer Terahertz Multi-Mode Interference Couplers","authors":"X. Liu, C. Geng, X. Guo, K. Kolpatzeck, L. Häring, J. Balzer, A. Czylwik","doi":"10.1109/IRMMW-THz46771.2020.9370927","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370927","url":null,"abstract":"In this paper, we present the design of one-dimensional symmetric and paired $1times 2$ multi-mode interference (MMI) couplers at 140 GHz applying a modal propagation analysis together with electromagnetic simulation. The designed couplers are fabricated by 3D printing and are characterized by terahertz frequency-domain spectroscopy. The measured amplitude imbalances between the outputs of the couplers are as good as 0.32 dB.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"25 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88374753","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370856
Duoxuan Ma, Dayong Wang, L. Rong, Yaya Zhang, Jie Zhao, Yunxin Wang
Continuous-wave terahertz total internal reflection digital holography (THz-TIRH) is proposed for the full-field and real-time complex refractive index measurement. The amplitude and phase images can be reconstructed from the hologram, subsequently the analytic solution of refractive index distribution can be reviewed. The experimental result demonstrates the feasibility of the THz-TIRH imaging method. Both absorption distribution and refractive index distribution are imaged by THz-TIRH 1in this paper.
{"title":"Continuous-wave Terahertz Total Internal Reflection Digital Holography","authors":"Duoxuan Ma, Dayong Wang, L. Rong, Yaya Zhang, Jie Zhao, Yunxin Wang","doi":"10.1109/IRMMW-THz46771.2020.9370856","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370856","url":null,"abstract":"Continuous-wave terahertz total internal reflection digital holography (THz-TIRH) is proposed for the full-field and real-time complex refractive index measurement. The amplitude and phase images can be reconstructed from the hologram, subsequently the analytic solution of refractive index distribution can be reviewed. The experimental result demonstrates the feasibility of the THz-TIRH imaging method. Both absorption distribution and refractive index distribution are imaged by THz-TIRH 1in this paper.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"11 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88459813","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370658
Y. Koike, S. Tetsukawa, M. Nishitani, H. Kitahara, V. Mag-usara, M. Asakawa, M. Yoshimura, M. Tani, M. Nakajima
We demonstrate the feasibility of mapping metallic layer thickness profile in 2 dimension based on the amplitude of the terahertz emission of a large area spintronic heterostructure. A Fe/Pt bilayer was deposited on glass substrate such that a 100 mm diameter circular space was covered with 4 nm Pt throughout and with a gradient of 0.5 nm to 7 nm thick Fe by magnetron sputtering. The Fe thickness dependence of the spintronic THz emission is clearly observed in just one sample by two-dimensional amplitude mapping.
{"title":"Terahertz emission amplitude-based 2D mapping of the Fe thickness profile in Fe/Pt spintronic heterostructure","authors":"Y. Koike, S. Tetsukawa, M. Nishitani, H. Kitahara, V. Mag-usara, M. Asakawa, M. Yoshimura, M. Tani, M. Nakajima","doi":"10.1109/IRMMW-THz46771.2020.9370658","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370658","url":null,"abstract":"We demonstrate the feasibility of mapping metallic layer thickness profile in 2 dimension based on the amplitude of the terahertz emission of a large area spintronic heterostructure. A Fe/Pt bilayer was deposited on glass substrate such that a 100 mm diameter circular space was covered with 4 nm Pt throughout and with a gradient of 0.5 nm to 7 nm thick Fe by magnetron sputtering. The Fe thickness dependence of the spintronic THz emission is clearly observed in just one sample by two-dimensional amplitude mapping.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"28 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88481880","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370545
J. Rhie, Y. Bahk, S. J. Hong, Dukhyung Lee, Dai‐Sik Kim
We demonstrated a switchable terahertz (THz) resonator by bending it outward with different radius curvatures (RCs), accordingly changing the shape of a diabolo array to a bowtie array. The resonance frequency switched to 0.5 THz and 1.08 THz as the flexible substrate of the resonator was flattened and bent. We analyzed the electrical properties in the I- V curve and optical properties in THz transmission spectra for the cases on flattening/bending/re-flattening after bending the resonator. A switchable THz resonator remains functional even though the operation originates from distorting the metallic array.
{"title":"Switching THz Resonances by Mechanical Bending","authors":"J. Rhie, Y. Bahk, S. J. Hong, Dukhyung Lee, Dai‐Sik Kim","doi":"10.1109/IRMMW-THz46771.2020.9370545","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370545","url":null,"abstract":"We demonstrated a switchable terahertz (THz) resonator by bending it outward with different radius curvatures (RCs), accordingly changing the shape of a diabolo array to a bowtie array. The resonance frequency switched to 0.5 THz and 1.08 THz as the flexible substrate of the resonator was flattened and bent. We analyzed the electrical properties in the I- V curve and optical properties in THz transmission spectra for the cases on flattening/bending/re-flattening after bending the resonator. A switchable THz resonator remains functional even though the operation originates from distorting the metallic array.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"39 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77432215","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370387
J. Neu, C. Schmuttenmaer
The basic building blocks of life are amino acids. Peptides are the next larger unit, formed by a few amino acids. This makes them an excellent model system to study weak intra- and intermolecular forces which are important to describe dynamics and function of organic molecules. We present results on L-carnosine and tetrameric enzymatic-peptides. We will discuss their spectra and compare the experimental findings with periodic boundary density functional theory calculations.
{"title":"Terahertz Time Domain Spectroscopy and Density Functional Theory Calculations of Peptides","authors":"J. Neu, C. Schmuttenmaer","doi":"10.1109/IRMMW-THz46771.2020.9370387","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370387","url":null,"abstract":"The basic building blocks of life are amino acids. Peptides are the next larger unit, formed by a few amino acids. This makes them an excellent model system to study weak intra- and intermolecular forces which are important to describe dynamics and function of organic molecules. We present results on L-carnosine and tetrameric enzymatic-peptides. We will discuss their spectra and compare the experimental findings with periodic boundary density functional theory calculations.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"315 1","pages":"01-01"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77572529","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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