Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567118
Elizaveta G. Tsiplakova, M. Kulya, B. Sokolenko, Andrei Gorodetsky, N. Petrov
We propose a spectral binary encoding technique with broadband terahertz pulses represented as interference field of uniformly topologically charged Laguerre-Gaussian terahertz beams carrying unitary and zero topological charges. The principles of the technique and the results of investigation of its possibilities are presented.
{"title":"Investigation of spectral encoding with terahertz broadband uniformly topologically charged beams","authors":"Elizaveta G. Tsiplakova, M. Kulya, B. Sokolenko, Andrei Gorodetsky, N. Petrov","doi":"10.1109/IRMMW-THz50926.2021.9567118","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567118","url":null,"abstract":"We propose a spectral binary encoding technique with broadband terahertz pulses represented as interference field of uniformly topologically charged Laguerre-Gaussian terahertz beams carrying unitary and zero topological charges. The principles of the technique and the results of investigation of its possibilities are presented.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"129 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73530580","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567069
Naining Guo, Q. Xue, Zhaowei Qu, Kegang Liu, Wenke Song
Sensitivity analysis for 0.34 THz ladder-type extended interaction cavity is studied using the ladder cavity models with manufacturing tolerance assuming normal distributions for the critical dimensions. The corresponding simulation results demonstrate manufacturing tolerances affect the key performance of the extended interaction cavity, including the field distortion, 2π-frequency shift, and the effective characteristic impedance.
{"title":"Sensitivity Analysis for THz Ladder-Type Extended Interaction Cavity","authors":"Naining Guo, Q. Xue, Zhaowei Qu, Kegang Liu, Wenke Song","doi":"10.1109/IRMMW-THz50926.2021.9567069","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567069","url":null,"abstract":"Sensitivity analysis for 0.34 THz ladder-type extended interaction cavity is studied using the ladder cavity models with manufacturing tolerance assuming normal distributions for the critical dimensions. The corresponding simulation results demonstrate manufacturing tolerances affect the key performance of the extended interaction cavity, including the field distortion, 2π-frequency shift, and the effective characteristic impedance.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74380033","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567157
S. Kuznetsov, N. Nikolaev, D. Utkin, Y. Peng, O. Cherkasova
Terahertz plasmonic sensors based on arrays of linear and H-shaped gold nanoantennas nanolithographically patterned on Si substrates with & without SiO2 sublayers are numerically and experimentally studied. The sensors are optimized for the plasmonic frequencies of 1.337 and 1.695 THz corresponding to the absorption bands of L-2HG and D-2HG isomers, respectively, which act as molecular biomarkers of glioma.
{"title":"Terahertz Nanoantenna Sensors for Detection of 2-Hydroxyglutarate Isomers in Biological Samples","authors":"S. Kuznetsov, N. Nikolaev, D. Utkin, Y. Peng, O. Cherkasova","doi":"10.1109/IRMMW-THz50926.2021.9567157","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567157","url":null,"abstract":"Terahertz plasmonic sensors based on arrays of linear and H-shaped gold nanoantennas nanolithographically patterned on Si substrates with & without SiO2 sublayers are numerically and experimentally studied. The sensors are optimized for the plasmonic frequencies of 1.337 and 1.695 THz corresponding to the absorption bands of L-2HG and D-2HG isomers, respectively, which act as molecular biomarkers of glioma.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"59 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74381161","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567411
Souvaraj De, R. Das, T. Kleine-Ostmann, T. Schneider
Optical sinc-shaped Nyquist pulses can be utilized for high-speed communication with minimal error as it enables orthogonality and rectangular shape in the frequency domain, etc. Nevertheless, for metrological evaluations, the performance of the system is hampered by the presence of non-idealities. In this work, we simulate and examine the impact of two prime non-idealities: the sideband suppression ratio (SSR) and the roll-off factor of sinc-shaped reconfigurable Nyquist pulse sequences based on 3-line optical phase-locked combs at a frequency spacing of 200 GHz. Furthermore, we estimate the root-mean-square (r.m.s.) error for the respective non-idealities.
{"title":"Characterization of non-idealities in optical Nyquist pulses for THz signal sampling metrology","authors":"Souvaraj De, R. Das, T. Kleine-Ostmann, T. Schneider","doi":"10.1109/IRMMW-THz50926.2021.9567411","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567411","url":null,"abstract":"Optical sinc-shaped Nyquist pulses can be utilized for high-speed communication with minimal error as it enables orthogonality and rectangular shape in the frequency domain, etc. Nevertheless, for metrological evaluations, the performance of the system is hampered by the presence of non-idealities. In this work, we simulate and examine the impact of two prime non-idealities: the sideband suppression ratio (SSR) and the roll-off factor of sinc-shaped reconfigurable Nyquist pulse sequences based on 3-line optical phase-locked combs at a frequency spacing of 200 GHz. Furthermore, we estimate the root-mean-square (r.m.s.) error for the respective non-idealities.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"18 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75154696","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567547
Diwei Liu, Jie Huang, X. Qi, Zheng Yan, P. Liang, Wei Wang, T. Song
Theoretical and experimental investigations on a frequency-tunable terahertz gyrotron have been presented in this paper. The effects of the slightly up-tapered sections in an improved multi-section gyrotron cavity on the resonant frequency and the quality factor are investigated in detail. In an optimized multi-section gyrotron cavity, the quality factor for all axial modes can maintain an order of magnitude in the cold cavity approximation, it means that the operating current for all axial modes can keep an order of magnitude. A resonator-based gyrotron oscillator can play dual functions: gyromonotron and reflected-type gyro-BWO corresponding to forward-wave and backward-wave operation. the field profile of the axial mode and beam-wave interaction efficiency of the gyromonotron and the reflected-type gyro-BWO are dramatically different from each other. And the gyromonotron state can switch to the reflected-type gyro-BWO state by means of increasing the operating magnetic field. A 263GHz frequency-tunable gyrotron at the fundamental cyclotron harmonic for the 400MHz DNP/NMR spectroscopy and a 527GHz frequency-tunable gyrotron at the second cyclotron harmonic for the 800MHz DNP/NMR spectroscopy are experimentally investigated.
{"title":"Theoretical and Experimental Investigations on the Frequency-Tunable Terahertz Gyrotron","authors":"Diwei Liu, Jie Huang, X. Qi, Zheng Yan, P. Liang, Wei Wang, T. Song","doi":"10.1109/IRMMW-THz50926.2021.9567547","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567547","url":null,"abstract":"Theoretical and experimental investigations on a frequency-tunable terahertz gyrotron have been presented in this paper. The effects of the slightly up-tapered sections in an improved multi-section gyrotron cavity on the resonant frequency and the quality factor are investigated in detail. In an optimized multi-section gyrotron cavity, the quality factor for all axial modes can maintain an order of magnitude in the cold cavity approximation, it means that the operating current for all axial modes can keep an order of magnitude. A resonator-based gyrotron oscillator can play dual functions: gyromonotron and reflected-type gyro-BWO corresponding to forward-wave and backward-wave operation. the field profile of the axial mode and beam-wave interaction efficiency of the gyromonotron and the reflected-type gyro-BWO are dramatically different from each other. And the gyromonotron state can switch to the reflected-type gyro-BWO state by means of increasing the operating magnetic field. A 263GHz frequency-tunable gyrotron at the fundamental cyclotron harmonic for the 400MHz DNP/NMR spectroscopy and a 527GHz frequency-tunable gyrotron at the second cyclotron harmonic for the 800MHz DNP/NMR spectroscopy are experimentally investigated.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"64 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75213343","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567174
Peidi Yang, Mingcong Dai, S. Hao, Hongting Xiong, Yicheng Cheng, Jiangping Zhou, Xiaojun Wu, J. Miao
Three-dimensional (3D) Nickel (Ni) Skeleton is a kind of flexible, process easily, low-cost, broadband, and efficient terahertz absorbing material, which can achieve more than 98% absorption in the frequency range of 0.5-2.0 THz. Based on this discovery, the feasibility of making 3D skeletal metal to achieve THz absorption is proposed and experimentally verified. It is believed that this discovery can accelerate the practical application of THz absorbing materials.
{"title":"A Ultrabroadband Efficient Practical Terahertz Absorber","authors":"Peidi Yang, Mingcong Dai, S. Hao, Hongting Xiong, Yicheng Cheng, Jiangping Zhou, Xiaojun Wu, J. Miao","doi":"10.1109/IRMMW-THz50926.2021.9567174","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567174","url":null,"abstract":"Three-dimensional (3D) Nickel (Ni) Skeleton is a kind of flexible, process easily, low-cost, broadband, and efficient terahertz absorbing material, which can achieve more than 98% absorption in the frequency range of 0.5-2.0 THz. Based on this discovery, the feasibility of making 3D skeletal metal to achieve THz absorption is proposed and experimentally verified. It is believed that this discovery can accelerate the practical application of THz absorbing materials.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"52 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75424059","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567129
A. Prokscha, F. Sheikh, M. Al-Hasan, I. Mabrouk, T. Kaiser
The study targets human locomotion gait for analyzing the blockage impact on terahertz (THz) wireless links. A 3D human model 6 m from the transmitter (TX) is thus employed to impose blockage in a line-of-sight (LoS) environment with vertically polarized horn antennas possessing divergent beams. Being in motion, the channels are captured by the receivers (RX) at 9 m and 12 m. Both the TX and RX antennas possess a gain of 25.45 dBi at 300 GHz. The blockage provoked by different phases in the total walking cycle (i.e., start position, swing phase, and step) is investigated with the help of ray-tracing simulations. Moreover, keeping in account the beam spot size a walking path of 1 m and 2 m are considered in the study. The results bring out into open that the blockage effect is partially greater when the human is moving in contrast to static phases.
{"title":"Blockage Impact of Human Locomotion Gaits on Terahertz Wireless Links","authors":"A. Prokscha, F. Sheikh, M. Al-Hasan, I. Mabrouk, T. Kaiser","doi":"10.1109/IRMMW-THz50926.2021.9567129","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567129","url":null,"abstract":"The study targets human locomotion gait for analyzing the blockage impact on terahertz (THz) wireless links. A 3D human model 6 m from the transmitter (TX) is thus employed to impose blockage in a line-of-sight (LoS) environment with vertically polarized horn antennas possessing divergent beams. Being in motion, the channels are captured by the receivers (RX) at 9 m and 12 m. Both the TX and RX antennas possess a gain of 25.45 dBi at 300 GHz. The blockage provoked by different phases in the total walking cycle (i.e., start position, swing phase, and step) is investigated with the help of ray-tracing simulations. Moreover, keeping in account the beam spot size a walking path of 1 m and 2 m are considered in the study. The results bring out into open that the blockage effect is partially greater when the human is moving in contrast to static phases.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74899312","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567206
D. Jayasankar, V. Drakinskiy, P. Sobis, J. Stake
In this paper, we report the development of single-ended, Schottky diode-based harmonic mixers operating at 3.5 THz and 4.7 THz, respectively. Both mixers utilize a sub-micron size Schottky diode fabricated with circuit elements on a suspended 2 µm-thick GaAs stripline circuit, and then assembled in a waveguide split-block. The diode is closely integrated with the RF-waveguide, resulting in an electrically small and compact circuit. For the 3.5-THz, ×6-harmonic mixer, a conversion loss of about 60 dB was measured at an intermediate frequency (IF) of 200 MHz. The predicted mixer performance versus dc bias agrees well with the measurements. Based on these results, the preliminary design and simulation results of a 4.7-THz, ×8-harmonic mixer, are presented.
{"title":"Development of Supra-THz Schottky Diode Harmonic Mixers","authors":"D. Jayasankar, V. Drakinskiy, P. Sobis, J. Stake","doi":"10.1109/IRMMW-THz50926.2021.9567206","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567206","url":null,"abstract":"In this paper, we report the development of single-ended, Schottky diode-based harmonic mixers operating at 3.5 THz and 4.7 THz, respectively. Both mixers utilize a sub-micron size Schottky diode fabricated with circuit elements on a suspended 2 µm-thick GaAs stripline circuit, and then assembled in a waveguide split-block. The diode is closely integrated with the RF-waveguide, resulting in an electrically small and compact circuit. For the 3.5-THz, ×6-harmonic mixer, a conversion loss of about 60 dB was measured at an intermediate frequency (IF) of 200 MHz. The predicted mixer performance versus dc bias agrees well with the measurements. Based on these results, the preliminary design and simulation results of a 4.7-THz, ×8-harmonic mixer, are presented.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72999793","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567376
R. Polito, M. Temperini, L. Puskar, U. Schade, L. Baldassarre, M. Ortolani, V. Giliberti
We present infrared (IR) nanospectroscopy results obtained on single hundred-nanometer-sized lipid microvesicles. The use of an IR nanospectroscopy platform allowed us to identify heterogeneities of the molecular cargo of the microvesicles that would not be possible by conventional IR spectroscopy.
{"title":"Tip-enhanced infrared nanospectroscopy of microvesiscles","authors":"R. Polito, M. Temperini, L. Puskar, U. Schade, L. Baldassarre, M. Ortolani, V. Giliberti","doi":"10.1109/IRMMW-THz50926.2021.9567376","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567376","url":null,"abstract":"We present infrared (IR) nanospectroscopy results obtained on single hundred-nanometer-sized lipid microvesicles. The use of an IR nanospectroscopy platform allowed us to identify heterogeneities of the molecular cargo of the microvesicles that would not be possible by conventional IR spectroscopy.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"3 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75397047","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 : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9566915
T. Furuya, J. Muldera, H. Kitahara, Taiki Ozaki, M. Bakunov, M. Tani
Terahertz generation in a thin (100-µm thick) GaAs crystal sandwiched between the walls of a metallic tapered parallel plate waveguide at its narrow end and pumped by a 1560-nm femtosecond laser has been experimentally studied. The terahertz radiation characteristics are compared with those from a thick bulk GaAs crystal in a free space. The results demonstrate that the taper structure improves the directivity of terahertz emission from thin crystals pumped by focused optical beams.
{"title":"Terahertz Radiation from a Thin GaAs Crystal in a Metallic Tapered Parallel Plate Waveguide","authors":"T. Furuya, J. Muldera, H. Kitahara, Taiki Ozaki, M. Bakunov, M. Tani","doi":"10.1109/IRMMW-THz50926.2021.9566915","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566915","url":null,"abstract":"Terahertz generation in a thin (100-µm thick) GaAs crystal sandwiched between the walls of a metallic tapered parallel plate waveguide at its narrow end and pumped by a 1560-nm femtosecond laser has been experimentally studied. The terahertz radiation characteristics are compared with those from a thick bulk GaAs crystal in a free space. The results demonstrate that the taper structure improves the directivity of terahertz emission from thin crystals pumped by focused optical beams.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"286 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75399999","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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