Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567461
Tian-yao Zhang, Zhaohui Zhang, Xiao-ming Zhao, Yang Yu, Ying Li, Xing-yue Li
For crystalline material with strong terahertz (THz) absorbance, the characterization with terahertz time-domain spectroscopy (THz-TDS) is typically performed on the mixture pellet where the analyte of interest is embedded within an inert polymer matrix. The polymer background significantly affects the phase delay of the propagating THz signal inside the sample, which makes the polymer matrix contribute to the overall dielectric response of the mixture sample to the probing THz waves. In this study, an analytical model was proposed to extract the target analyte’s intrinsic dielectric constants from the experimental dielectric spectra of the diluted mixture.
{"title":"Determination of Intrinsic Dielectric Constants at Terahertz Frequencies for Crystalline Materials Diluted in Polymer Matrix","authors":"Tian-yao Zhang, Zhaohui Zhang, Xiao-ming Zhao, Yang Yu, Ying Li, Xing-yue Li","doi":"10.1109/IRMMW-THz50926.2021.9567461","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567461","url":null,"abstract":"For crystalline material with strong terahertz (THz) absorbance, the characterization with terahertz time-domain spectroscopy (THz-TDS) is typically performed on the mixture pellet where the analyte of interest is embedded within an inert polymer matrix. The polymer background significantly affects the phase delay of the propagating THz signal inside the sample, which makes the polymer matrix contribute to the overall dielectric response of the mixture sample to the probing THz waves. In this study, an analytical model was proposed to extract the target analyte’s intrinsic dielectric constants from the experimental dielectric spectra of the diluted mixture.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"183 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":"80459460","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-THz50926.2021.9566991
Aritrio Bandyopadhyay, F. Pavanello, E. Peytavit, J. Lampin, M. Zegaoui, M. Zaknoune, P. Szriftgiser, G. Ducournau
We report on the use of a Yagi-Uda antenna on polymer substrate used for indoor 300 GHz data-link applications. The Yagi-Uda antenna-based data-link is validated for up to QAM-16 signals (100 Gbit/s).
{"title":"Up to 100 Gbit/s short link using 300 GHz band Yagi-Uda antenna","authors":"Aritrio Bandyopadhyay, F. Pavanello, E. Peytavit, J. Lampin, M. Zegaoui, M. Zaknoune, P. Szriftgiser, G. Ducournau","doi":"10.1109/IRMMW-THz50926.2021.9566991","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566991","url":null,"abstract":"We report on the use of a Yagi-Uda antenna on polymer substrate used for indoor 300 GHz data-link applications. The Yagi-Uda antenna-based data-link is validated for up to QAM-16 signals (100 Gbit/s).","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"215 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":"76967765","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-THz50926.2021.9566872
I. Bandurkin, Yu. M. Guznov, Yuriy K. Kalynov, G. Kalynova, I. Osharin, A. Savilov, D. Shchegolkov
We describe a series of works aimed at creating high-harmonic gyrotrons with cavities of complicated shapes as a way to increase efficiencies of their operation and to improve their selective properties. These works are mainly aimed at the implementation of the large-orbit gyrotrons developed at our Institute on the basis of two experimental installations. At the same time, some approaches have proved attractive also for traditional gyrotron configurations.
{"title":"Complicated Electrodynamic Systems for Sub-THz High-Harmonic Gyrotrons","authors":"I. Bandurkin, Yu. M. Guznov, Yuriy K. Kalynov, G. Kalynova, I. Osharin, A. Savilov, D. Shchegolkov","doi":"10.1109/IRMMW-THz50926.2021.9566872","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566872","url":null,"abstract":"We describe a series of works aimed at creating high-harmonic gyrotrons with cavities of complicated shapes as a way to increase efficiencies of their operation and to improve their selective properties. These works are mainly aimed at the implementation of the large-orbit gyrotrons developed at our Institute on the basis of two experimental installations. At the same time, some approaches have proved attractive also for traditional gyrotron configurations.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"24 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":"81742900","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-THz50926.2021.9567337
A. Dobroiu, Kotaro Asama, S. Suzuki, M. Asada, H. Ito
We report on a three-dimensional imaging system obtained by combining an amplitude-modulated continuous-wave (AMCW) radar with two-dimensional mechanical scanning. The system is based on a resonant-tunneling-diode (RTD) oscillator emitting at 660 GHz and modulated at 4.5 GHz. The axial distance measurement relies on determining the phase of the demodulated signal by means of an IQ mixer. With careful calibration, the distance measurement error was reduced to 20 µm.
{"title":"Three-dimensional terahertz imaging using an amplitude-modulated resonant-tunneling-diode oscillator","authors":"A. Dobroiu, Kotaro Asama, S. Suzuki, M. Asada, H. Ito","doi":"10.1109/IRMMW-THz50926.2021.9567337","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567337","url":null,"abstract":"We report on a three-dimensional imaging system obtained by combining an amplitude-modulated continuous-wave (AMCW) radar with two-dimensional mechanical scanning. The system is based on a resonant-tunneling-diode (RTD) oscillator emitting at 660 GHz and modulated at 4.5 GHz. The axial distance measurement relies on determining the phase of the demodulated signal by means of an IQ mixer. With careful calibration, the distance measurement error was reduced to 20 µm.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"23 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":"82091467","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}
This article mainly introduces our research group’s latest progress in THz camera. Nb5N6 film is a THz sensitive material and has a significant prospect in THz detection. We use this material to fabricate an antenna coupled microbolometer THz detector array at room temperature, and integrated 180 nm CMOS process readout circuit. The THz camera has a resolution of 32×32, pixel size of 250×250 μm, frame rate of 30, working range is 0.25-1 THz. Compared with the type of pyro-electric infrared camera, below 1 THz terahertz spectrum has significant advantages, with a higher response rate and a lower NEP.
{"title":"An Nb5N6 microbolometer THz camera","authors":"Shuyu Zhou, Zhenjie Li, Pengfei Chen, X. Tu, Chengtao Jiang, Yichen Zhang, Qianghua Wu, Mengxin Liu, X. Jia, L. Kang, Jian Chen, Peiheng Wu","doi":"10.1109/IRMMW-THz50926.2021.9567095","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567095","url":null,"abstract":"This article mainly introduces our research group’s latest progress in THz camera. Nb5N6 film is a THz sensitive material and has a significant prospect in THz detection. We use this material to fabricate an antenna coupled microbolometer THz detector array at room temperature, and integrated 180 nm CMOS process readout circuit. The THz camera has a resolution of 32×32, pixel size of 250×250 μm, frame rate of 30, working range is 0.25-1 THz. Compared with the type of pyro-electric infrared camera, below 1 THz terahertz spectrum has significant advantages, with a higher response rate and a lower NEP.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"29 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":"78952697","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-THz50926.2021.9566874
Mohamed Shehata, Ke Wang, J. Webber, M. Fujita, T. Nagatsuma, W. Withayachumnankul
We propose a pulse shape design that fully complies with the spectral emission requirements of the IEEE 802.15.3d Standard. The proposed pulse shape offers up to two orders of magnitude of improvement in the bit error rate performance compared to the conventional raised-cosine pulse.
{"title":"Waveforms with High Spectral Efficiency for Terahertz Communications","authors":"Mohamed Shehata, Ke Wang, J. Webber, M. Fujita, T. Nagatsuma, W. Withayachumnankul","doi":"10.1109/IRMMW-THz50926.2021.9566874","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566874","url":null,"abstract":"We propose a pulse shape design that fully complies with the spectral emission requirements of the IEEE 802.15.3d Standard. The proposed pulse shape offers up to two orders of magnitude of improvement in the bit error rate performance compared to the conventional raised-cosine pulse.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"58 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":"76521805","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-THz50926.2021.9567340
S. Rajabali, E. Cortese, M. Beck, S. Liberato, J. Faist, G. Scalari
We report a physical limit for reducing the modal volume of a cavity and ultimately increasing the light-matter coupling strength. Extremely confined photonic mode below a critical length-scale can introduce a large in-plane wave vector and excite a continuum of high momentum matter resonances. This excitations act as loss channels and reduce the field confinement by smearing the distribution of surface charges, thus consequently limiting the achievable field enhancement.
{"title":"Breakdown of Polaritons in Nanophotonic Systems","authors":"S. Rajabali, E. Cortese, M. Beck, S. Liberato, J. Faist, G. Scalari","doi":"10.1109/IRMMW-THz50926.2021.9567340","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567340","url":null,"abstract":"We report a physical limit for reducing the modal volume of a cavity and ultimately increasing the light-matter coupling strength. Extremely confined photonic mode below a critical length-scale can introduce a large in-plane wave vector and excite a continuum of high momentum matter resonances. This excitations act as loss channels and reduce the field confinement by smearing the distribution of surface charges, thus consequently limiting the achievable field enhancement.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"272 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":"76559667","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-THz50926.2021.9567484
Tomoya Niki, Tomoki Kotani, Jin Wang, K. Sakai, T. Kiwa
It is important to evaluate the penetration depth and speed of cosmetics into the skin for the cosmetic industry. However, the conventional method for measuring those parameters has some drawbacks. In this study, a terahertz time-of-flight method with Si-based emitter was applied for evaluation. The penetration of the liquid into a pig skin was measured as a travelling time of the THz pulses irradiating on a pigskin, where the glycerin concentration in the liquid was varied.
{"title":"Evaluation of Cosmetic Liquid Penetration Using Terahertz Time-of-Flight Method","authors":"Tomoya Niki, Tomoki Kotani, Jin Wang, K. Sakai, T. Kiwa","doi":"10.1109/IRMMW-THz50926.2021.9567484","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567484","url":null,"abstract":"It is important to evaluate the penetration depth and speed of cosmetics into the skin for the cosmetic industry. However, the conventional method for measuring those parameters has some drawbacks. In this study, a terahertz time-of-flight method with Si-based emitter was applied for evaluation. The penetration of the liquid into a pig skin was measured as a travelling time of the THz pulses irradiating on a pigskin, where the glycerin concentration in the liquid was varied.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"11 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":"86290209","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-THz50926.2021.9567559
A. Mamrashev, F. Minakov, N. Nikolaev, V. Antsygin
We suggest a method to simultaneously measure terahertz optical properties of crystals along two axes in terahertz time-domain spectroscopy using two broadband polarizers. We demonstrate the method by measuring temperature dependence of refractive index and absorption coefficient of lithium triborate crystal along different optical axes.
{"title":"Simultaneous Measurements of Broadband Terahertz Properties of Crystals along Two Axes","authors":"A. Mamrashev, F. Minakov, N. Nikolaev, V. Antsygin","doi":"10.1109/IRMMW-THz50926.2021.9567559","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567559","url":null,"abstract":"We suggest a method to simultaneously measure terahertz optical properties of crystals along two axes in terahertz time-domain spectroscopy using two broadband polarizers. We demonstrate the method by measuring temperature dependence of refractive index and absorption coefficient of lithium triborate crystal along different optical axes.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"2013 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":"86381932","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-THz50926.2021.9567006
S. Sotgiu, M. Malerba, L. Baldassarre, R. Gillibert, V. Giliberti, M. Ortolani, R. Colombelli
Surface current patterns in single patch antennas are imaged by means of photoexpansion nanospectroscopy performed with an atomic force microscopy probe and a broadly tunable quantum cascade laser system. The local ohmic losses lead to temperature increase of a thin polymer layer positioned in the cavity, which then expands.
{"title":"Mid-infrared nano-imaging of current patterns in patch antenna resonators","authors":"S. Sotgiu, M. Malerba, L. Baldassarre, R. Gillibert, V. Giliberti, M. Ortolani, R. Colombelli","doi":"10.1109/IRMMW-THz50926.2021.9567006","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567006","url":null,"abstract":"Surface current patterns in single patch antennas are imaged by means of photoexpansion nanospectroscopy performed with an atomic force microscopy probe and a broadly tunable quantum cascade laser system. The local ohmic losses lead to temperature increase of a thin polymer layer positioned in the cavity, which then expands.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"93 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":"83870091","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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