Pub Date : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370524
Weijie Gao, C. Fumeaux, W. Withayachumnankul
Efficient integrated systems can be considered as a next milestone for practical applications of terahertz technology. Various types of integrated platforms have been directly scaled from either the microwave or optical domain, with benefits and drawbacks. Here, we discuss a concept of all-silicon components based on our recently proposed effective-medium-clad dielectric waveguides. The concept prioritizes bandwidth and efficiency, much needed in the terahertz domain. Auxiliary factors include cost and structural simplicity, which are also accounted for in this context. We demonstrate two generic components, namely filters and polarization splitters, that are fundamental to integrated systems.
{"title":"All-Silicon Terahertz Components Towards Efficient Integrated Systems","authors":"Weijie Gao, C. Fumeaux, W. Withayachumnankul","doi":"10.1109/IRMMW-THz46771.2020.9370524","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370524","url":null,"abstract":"Efficient integrated systems can be considered as a next milestone for practical applications of terahertz technology. Various types of integrated platforms have been directly scaled from either the microwave or optical domain, with benefits and drawbacks. Here, we discuss a concept of all-silicon components based on our recently proposed effective-medium-clad dielectric waveguides. The concept prioritizes bandwidth and efficiency, much needed in the terahertz domain. Auxiliary factors include cost and structural simplicity, which are also accounted for in this context. We demonstrate two generic components, namely filters and polarization splitters, that are fundamental to integrated systems.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"2 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":"75743100","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-THz46771.2020.9370360
Qiang Chen, W. Wang, T. Song, Diwei Liu
This paper presents a vector method for the synthesis of hybrid-type launcher for the high power gyrotron. A computer code has been developed for calculating electromagnetic fields in the launcher. Based on this method, a launcher used for the gyrotron operating at 0.5THz-TE8,5 mode, has been designed and optimized. The results show that the fundamental Gaussian mode content (FGMC) of 99.26% of the RF wave beam is achieved at the aperture of launcher.
{"title":"A Vector Method for the Synthesis of Hybrid-type Launcher","authors":"Qiang Chen, W. Wang, T. Song, Diwei Liu","doi":"10.1109/IRMMW-THz46771.2020.9370360","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370360","url":null,"abstract":"This paper presents a vector method for the synthesis of hybrid-type launcher for the high power gyrotron. A computer code has been developed for calculating electromagnetic fields in the launcher. Based on this method, a launcher used for the gyrotron operating at 0.5THz-TE8,5 mode, has been designed and optimized. The results show that the fundamental Gaussian mode content (FGMC) of 99.26% of the RF wave beam is achieved at the aperture of launcher.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"8 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":"72975546","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-THz46771.2020.9370508
A. Galeeva, A. Kazakov, A. Ikonnikov, A. Artamkin, D. Belov, L. Ryabova, V. Volobuev, G. Springholz, S. Danilov, D. Khokhlov
We studied the photoelectromagnetic (PEM) effect induced by laser terahertz radiation in $text{Pb}_{1_{-x}}text{Sn}_{x}text{Te}$ films in the composition range $x=(0.15-0.45)$. A transition from the trivial phase to the topological crystalline insulator phase occurs within this composition interval at $x=0.35$. The films had the crystallographic orientation $< 111 >$, for which the appearance of topologically nontrivial surface states is expected. It was found that in the trivial phase, the amplitude of the PEM effect is determined by the power of the incident radiation, while in the topological phase, the amplitude is proportional to the flux of laser radiation quanta. Possible mechanism leading to the observed effect is discussed.
{"title":"Photoelectromagnetic Effect Induced by Terahertz Laser Radiation in Topological Crystalline Insulators Pbl-xSnx Te","authors":"A. Galeeva, A. Kazakov, A. Ikonnikov, A. Artamkin, D. Belov, L. Ryabova, V. Volobuev, G. Springholz, S. Danilov, D. Khokhlov","doi":"10.1109/IRMMW-THz46771.2020.9370508","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370508","url":null,"abstract":"We studied the photoelectromagnetic (PEM) effect induced by laser terahertz radiation in $text{Pb}_{1_{-x}}text{Sn}_{x}text{Te}$ films in the composition range $x=(0.15-0.45)$. A transition from the trivial phase to the topological crystalline insulator phase occurs within this composition interval at $x=0.35$. The films had the crystallographic orientation $< 111 >$, for which the appearance of topologically nontrivial surface states is expected. It was found that in the trivial phase, the amplitude of the PEM effect is determined by the power of the incident radiation, while in the topological phase, the amplitude is proportional to the flux of laser radiation quanta. Possible mechanism leading to the observed effect is discussed.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"1 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":"73036112","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-THz46771.2020.9370703
A. Gupta, V. Gupta, A. Sharma, B. Monoszlai, P. S. Nugraha, G. Polónyi, G. Krizsán, Á. Burián, Szabolcs Turnár, J. Hebling, G. Almási, J. Fülöp
A user-accessible compact nonlinear THz spectroscopy facility (NLTSF) is available at ELI-ALPS. It enables to carry out THz pump–THz probe measurements with >0.4 MV/cm peak field strengths in the 0.1-2.5 THz frequency range. THz-induced transient absorption in n-doped Ge was investigated at 300 K and 100 K temperatures.
{"title":"Nonlinear THz Spectroscopy User Facility at ELI-ALPS","authors":"A. Gupta, V. Gupta, A. Sharma, B. Monoszlai, P. S. Nugraha, G. Polónyi, G. Krizsán, Á. Burián, Szabolcs Turnár, J. Hebling, G. Almási, J. Fülöp","doi":"10.1109/IRMMW-THz46771.2020.9370703","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370703","url":null,"abstract":"A user-accessible compact nonlinear THz spectroscopy facility (NLTSF) is available at ELI-ALPS. It enables to carry out THz pump–THz probe measurements with >0.4 MV/cm peak field strengths in the 0.1-2.5 THz frequency range. THz-induced transient absorption in n-doped Ge was investigated at 300 K and 100 K temperatures.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"56 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":"74228810","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-THz46771.2020.9370665
B. Hampel, M. Tollkühn, I. Elenskiy, M. Schilling
A THz microscope employs a superconducting Josephson cantilever as a sensor to visualize the spatial power distribution of high-frequency radiation above a sample. This setup can be used to investigate additive manufactured optical components. In this work, a far-infrared laser system is employed as a radiation source. The laser beam can be quasi-optically coupled into the vacuum chamber of the THz microscope. The interaction of the laser beam with additive manufactured components such as lenses is measured and subsequently three-dimensionally visualized.
{"title":"THz Microscopy of Additive Manufactured Optical Components","authors":"B. Hampel, M. Tollkühn, I. Elenskiy, M. Schilling","doi":"10.1109/IRMMW-THz46771.2020.9370665","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370665","url":null,"abstract":"A THz microscope employs a superconducting Josephson cantilever as a sensor to visualize the spatial power distribution of high-frequency radiation above a sample. This setup can be used to investigate additive manufactured optical components. In this work, a far-infrared laser system is employed as a radiation source. The laser beam can be quasi-optically coupled into the vacuum chamber of the THz microscope. The interaction of the laser beam with additive manufactured components such as lenses is measured and subsequently three-dimensionally visualized.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"60 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":"74400618","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-THz46771.2020.9370625
Mahmoud E. Khani, M. Arbab
Dielectric heterogeneity in addition to wavelength-scale air voids and granular particles lead to significant electromagnetic scattering in the transmission-mode THz-TDS. These scattering processes result in the distorted or obscured resonant signatures, a frequency-dependent extinction loss, and the appearance of anomalous spectral artifacts, imposing severe challenges on the real-world automatic material characterization schemes. In this work, we use a combination of the wavelet multiresolution analysis, the principal component analysis, and the bimodality coefficient to simultaneously identify all the resonant frequencies of a heterogeneous sample embedded beneath a highly scattering turbid medium.
{"title":"Two Wavelet-based Algorithms for Chemical Recognition Using Transmission Terahertz Spectral Imaging Through Turbid Media","authors":"Mahmoud E. Khani, M. Arbab","doi":"10.1109/IRMMW-THz46771.2020.9370625","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370625","url":null,"abstract":"Dielectric heterogeneity in addition to wavelength-scale air voids and granular particles lead to significant electromagnetic scattering in the transmission-mode THz-TDS. These scattering processes result in the distorted or obscured resonant signatures, a frequency-dependent extinction loss, and the appearance of anomalous spectral artifacts, imposing severe challenges on the real-world automatic material characterization schemes. In this work, we use a combination of the wavelet multiresolution analysis, the principal component analysis, and the bimodality coefficient to simultaneously identify all the resonant frequencies of a heterogeneous sample embedded beneath a highly scattering turbid medium.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"55 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":"74176284","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-THz46771.2020.9370820
Bahaa Al-Juboori
This paper presents a rectangular waveguide diplexer based on a T-junction can separate a common input signal into two distanced channels at millimeter-wave (mm-wave) spectrum. This diplexer is capable of separating of two channels operating at the frequencies 116 GHz and 183 GHz providing passbands of 4 GHz and 16 GHz for these two channels, respectively. In this work, a H-plane waveguide T-junction is used to achieve the desired results. The simulated results are in good agreement with the diplexer specifications. A return loss of more than 20 dB and an insertion loss of less than 1 dB have been obtained for both channels.
{"title":"Millimeter-Wave Waveguide Diplexer","authors":"Bahaa Al-Juboori","doi":"10.1109/IRMMW-THz46771.2020.9370820","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370820","url":null,"abstract":"This paper presents a rectangular waveguide diplexer based on a T-junction can separate a common input signal into two distanced channels at millimeter-wave (mm-wave) spectrum. This diplexer is capable of separating of two channels operating at the frequencies 116 GHz and 183 GHz providing passbands of 4 GHz and 16 GHz for these two channels, respectively. In this work, a H-plane waveguide T-junction is used to achieve the desired results. The simulated results are in good agreement with the diplexer specifications. A return loss of more than 20 dB and an insertion loss of less than 1 dB have been obtained for both channels.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"47 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":"79245679","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-THz46771.2020.9370701
Y. Grachev, Vladimir A. Kokliushkin, N. Petrov
Terahertz (THz) time-domain holographic detection unit prototype for studying propagation dynamics of broadband vortex beams carrying optical angular momentum was developed. The setup consists of a femtosecond laser system, a THz radiation generator, a replaceable set of modulation components for shaping various OAM-beams, an optical delay line, and a wide-aperture electro-optical detecting module with 3D-printed mechanical parts. 3D-printed kinematic mounts of designed detection unit are available for public use as open-source hardware.
{"title":"An Open-Source 3D-Printed Terahertz Pulse Time-Domain Holographic Detection Module for Broadband Beam Inspection","authors":"Y. Grachev, Vladimir A. Kokliushkin, N. Petrov","doi":"10.1109/IRMMW-THz46771.2020.9370701","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370701","url":null,"abstract":"Terahertz (THz) time-domain holographic detection unit prototype for studying propagation dynamics of broadband vortex beams carrying optical angular momentum was developed. The setup consists of a femtosecond laser system, a THz radiation generator, a replaceable set of modulation components for shaping various OAM-beams, an optical delay line, and a wide-aperture electro-optical detecting module with 3D-printed mechanical parts. 3D-printed kinematic mounts of designed detection unit are available for public use as open-source hardware.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"153 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":"84783555","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-THz46771.2020.9370964
N. Matlis, D. Zhang, M. Fakhari, H. Cankaya, A. Calendron, F. Kärtner
Electron accelerators powered by terahertz (THz) radiation have recently emerged as promising candidates for next-generation compact electron sources. Although initial work has demonstrated impressive capabilities for acceleration and beam manipulation, the THz drivers used have been single-cycle pulses which are easier to generate at high field strengths, but are less favorable for scaling to long interaction lengths. Here we report, for the first time, use of narrow-band multi-cycle THz drivers for electron manipulation (acceleration, compression, and focusing). Moreover, we propose and demonstrate a novel scheme of cascaded acceleration, uniquely suited to multicycle drivers, for increasing the interaction length by re-cycling and- phasing the interaction. This work opens new possibilities for the design of THz based accelerators.
{"title":"Multi-cycle THz driven electron acceleration and THz-energy recycling","authors":"N. Matlis, D. Zhang, M. Fakhari, H. Cankaya, A. Calendron, F. Kärtner","doi":"10.1109/IRMMW-THz46771.2020.9370964","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370964","url":null,"abstract":"Electron accelerators powered by terahertz (THz) radiation have recently emerged as promising candidates for next-generation compact electron sources. Although initial work has demonstrated impressive capabilities for acceleration and beam manipulation, the THz drivers used have been single-cycle pulses which are easier to generate at high field strengths, but are less favorable for scaling to long interaction lengths. Here we report, for the first time, use of narrow-band multi-cycle THz drivers for electron manipulation (acceleration, compression, and focusing). Moreover, we propose and demonstrate a novel scheme of cascaded acceleration, uniquely suited to multicycle drivers, for increasing the interaction length by re-cycling and- phasing the interaction. This work opens new possibilities for the design of THz based accelerators.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"7 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":"85015324","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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