Pub Date : 2019-09-01DOI: 10.1109/IRMMW-THz.2019.8873699
I. Grigelionis, P. Prystawko, J. Jorudas, I. Kašalynas
we investigated radiative phenomena contributing to the THz emission of AlGaN/GaN high electron mobility transistor (HEMT) structures grown on sapphire substrate. Electrically controlled emission spectroscopy was performed in the frequency range 100–600 cm-1 at a temperature of 20 K. The electroluminescence from nitrogen vacancies in GaN buffer layer contributed to the THz emission spectrum, and the amplitude and frequency of the observed narrow emission lines were controlled by applied voltage.
{"title":"Electrically-controlled THz emission from AlGaN/GaN/Al2O3 high electron mobility transistor structures at a temperature of 20 K","authors":"I. Grigelionis, P. Prystawko, J. Jorudas, I. Kašalynas","doi":"10.1109/IRMMW-THz.2019.8873699","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8873699","url":null,"abstract":"we investigated radiative phenomena contributing to the THz emission of AlGaN/GaN high electron mobility transistor (HEMT) structures grown on sapphire substrate. Electrically controlled emission spectroscopy was performed in the frequency range 100–600 cm-1 at a temperature of 20 K. The electroluminescence from nitrogen vacancies in GaN buffer layer contributed to the THz emission spectrum, and the amplitude and frequency of the observed narrow emission lines were controlled by applied voltage.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"7 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":"80926946","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.2019.8873812
M. A. Báez-Chorro, R. Llorens-Chiralt, B. Vidal
Terahertz spectroscopy is used to obtain the optical parameters of polypropylene samples with different concentrations of multi walled carbon nanotubes. Results are put in context with previous works utilizing other kinds of polymer matrixes and an noticeable discrepancy in the behavior of attenuation with increasing loading content is found.
{"title":"A Comparison of THz Spectroscopy Measurements of Carbon Nanotubes Embedded in Polymer Matrices","authors":"M. A. Báez-Chorro, R. Llorens-Chiralt, B. Vidal","doi":"10.1109/IRMMW-THz.2019.8873812","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8873812","url":null,"abstract":"Terahertz spectroscopy is used to obtain the optical parameters of polypropylene samples with different concentrations of multi walled carbon nanotubes. Results are put in context with previous works utilizing other kinds of polymer matrixes and an noticeable discrepancy in the behavior of attenuation with increasing loading content is found.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"42 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":"79537799","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.2019.8873909
Zhongbo Zhu, Wei-dong Hu, Xianqi Lin, Xiaojun Li
A sub-terahertz retrodirective antenna array is proposed. This array receives 40 GHz navigation signal and accurately retransmits 120 GHz beam in the direction of arrival wave. Simulation results indicate that proposed array with stacked sandwich structure has realized the tracking of the arrival wave. The scanning radiation pattern shows array gain is 23.87 dB at 19.9° when incident angle is 20° with a relative error of only 0.5%, which means there is a lateral error of only 8.7 meters at a transmission distance of 5 kilometers.
{"title":"A Sub-Terahertz Retrodirective Antenna Array for Satellite Tracking","authors":"Zhongbo Zhu, Wei-dong Hu, Xianqi Lin, Xiaojun Li","doi":"10.1109/IRMMW-THz.2019.8873909","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8873909","url":null,"abstract":"A sub-terahertz retrodirective antenna array is proposed. This array receives 40 GHz navigation signal and accurately retransmits 120 GHz beam in the direction of arrival wave. Simulation results indicate that proposed array with stacked sandwich structure has realized the tracking of the arrival wave. The scanning radiation pattern shows array gain is 23.87 dB at 19.9° when incident angle is 20° with a relative error of only 0.5%, which means there is a lateral error of only 8.7 meters at a transmission distance of 5 kilometers.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"24 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":"84098185","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.2019.8874539
Xing Zheng, Jing-Qiang Wu, Yun-kui Zhang, Ziji Liu, Zhiming Wu, Jun Gou, Tao Wang, Yadong Jiang
Due to the long terahertz (THz) wavelength, it remains a challenging problem to achieve THz wave absorption through building an effective optical resonant cavity for THz wave with THz focal plane arrays. In this paper, a multiple spin coating (MSC) process was developed for the first time to increase the height of the optical resonant cavity. Four resonant cavities with different heights were fabricated and their abilities to absorb THz waves were tested respectively. The tests suggested that the different THz bands were absorbed effectively by the micro-bridge structure using the proposed MSC process.
{"title":"Fabrication of quarter THz wavelength resonant cavity using a multiple spin coating process","authors":"Xing Zheng, Jing-Qiang Wu, Yun-kui Zhang, Ziji Liu, Zhiming Wu, Jun Gou, Tao Wang, Yadong Jiang","doi":"10.1109/IRMMW-THz.2019.8874539","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8874539","url":null,"abstract":"Due to the long terahertz (THz) wavelength, it remains a challenging problem to achieve THz wave absorption through building an effective optical resonant cavity for THz wave with THz focal plane arrays. In this paper, a multiple spin coating (MSC) process was developed for the first time to increase the height of the optical resonant cavity. Four resonant cavities with different heights were fabricated and their abilities to absorb THz waves were tested respectively. The tests suggested that the different THz bands were absorbed effectively by the micro-bridge structure using the proposed MSC process.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"6 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":"84168200","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.2019.8874078
M. Mrnka, P. Nielsen, Tonny Rubæk, C. Cappellin, R. Appleby, E. Sáenz
This paper describes a numerical validation of the transmission coefficient of a smooth dielectric sample recently measured at ESA-ESTEC during the integration testing of a scatterometer operating in 50-750 GHz frequency range. The aim of the paper is to compare the experimental results of a calibrated measurement with a numerical model in GRASP and describe a numerical method for extracting material parameters.
{"title":"Characterization of Smooth Dielectric Samples with Highly Focused Gaussian Beams in a Scatterometer","authors":"M. Mrnka, P. Nielsen, Tonny Rubæk, C. Cappellin, R. Appleby, E. Sáenz","doi":"10.1109/IRMMW-THz.2019.8874078","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8874078","url":null,"abstract":"This paper describes a numerical validation of the transmission coefficient of a smooth dielectric sample recently measured at ESA-ESTEC during the integration testing of a scatterometer operating in 50-750 GHz frequency range. The aim of the paper is to compare the experimental results of a calibrated measurement with a numerical model in GRASP and describe a numerical method for extracting material parameters.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"64 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":"77936288","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.2019.8873925
Ashwini Sawant, I. Lee, M. Choe, E. Choi
We presented the design of a 190 GHz second harmonic gyrotron capable of generating few kWs of power in a mode-pair TE8,3 and TE11,2 at fixed magnetic field and different operating voltages. Conventional cavity with two sinusoidal perturbations has been used to reduce the mode competition from fundamental mode. It is designed for the conceptual study of OAM communication using gyrotron mode.
{"title":"Development of the Second Harmonic 190 GHz Gyrotron for OAM Communication","authors":"Ashwini Sawant, I. Lee, M. Choe, E. Choi","doi":"10.1109/IRMMW-THz.2019.8873925","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8873925","url":null,"abstract":"We presented the design of a 190 GHz second harmonic gyrotron capable of generating few kWs of power in a mode-pair TE8,3 and TE11,2 at fixed magnetic field and different operating voltages. Conventional cavity with two sinusoidal perturbations has been used to reduce the mode competition from fundamental mode. It is designed for the conceptual study of OAM communication using gyrotron mode.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"79 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":"76634332","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.2019.8874319
D. Turan, N. Yardimci, M. Jarrahi
We present a bias-free, telecommunication-compatible, photoconductive terahertz source that generates terahertz powers as high as 0.4 mW, enabling time domain terahertz spectroscopy with up to 90 dB dynamic range up to a 3.5 THz bandwidth.
{"title":"0.4 mW Terahertz Power Generation through Bias-Free, Telecommunication-Compatible, Photoconductive Nano-Antennas","authors":"D. Turan, N. Yardimci, M. Jarrahi","doi":"10.1109/IRMMW-THz.2019.8874319","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8874319","url":null,"abstract":"We present a bias-free, telecommunication-compatible, photoconductive terahertz source that generates terahertz powers as high as 0.4 mW, enabling time domain terahertz spectroscopy with up to 90 dB dynamic range up to a 3.5 THz bandwidth.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"111 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":"82417169","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.2019.8874406
B. Limbacher, M. Kainz, S. Schönhuber, M. Wenclawiak, C. Derntl, H. Detz, A. Andrews, G. Strasser, A. Schwaighofer, B. Lend, J. Darmo, K. Unterrainer
We demonstrate the presence of Intersubband Polaritons [1] in Triple Barrier Resonant Tunneling Diodes (TBRTDs) [2]. Additionally, we investigated the influence of Intersubband Polaritons on the electrical transport and show that the coupling-strength can be modulated electrically.
{"title":"Intersubband Polaritons in Triple Barrier Resonant Tunneling Diodes","authors":"B. Limbacher, M. Kainz, S. Schönhuber, M. Wenclawiak, C. Derntl, H. Detz, A. Andrews, G. Strasser, A. Schwaighofer, B. Lend, J. Darmo, K. Unterrainer","doi":"10.1109/IRMMW-THz.2019.8874406","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8874406","url":null,"abstract":"We demonstrate the presence of Intersubband Polaritons [1] in Triple Barrier Resonant Tunneling Diodes (TBRTDs) [2]. Additionally, we investigated the influence of Intersubband Polaritons on the electrical transport and show that the coupling-strength can be modulated electrically.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"14 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":"82570729","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.2019.8873893
Rhiannon Lees, Michael D. Cooke, C. Balocco, A. Gallant
We report on THz metamaterials for chemical sensing fabricated on low-loss, plastic, flexible substrates. The metamaterial is bonded to a paper sheet, which is saturated with the liquid to be analysed. Liquids in contact with the metamaterial surface with different refractive indices result in a shift of the metamaterial resonant frequency. This shift in frequency can be detected by measuring its complex transmission using a THz vector network analyser, in the frequency range 0.75–1.1 THz. The sensitivity of the metamaterial is 0.0015 refractive index units for a spectral resolution of 1 GHz which is well achievable with the VNA system.
{"title":"Flexible THz Metamaterials Bonded to Paper for Chemical Sensing","authors":"Rhiannon Lees, Michael D. Cooke, C. Balocco, A. Gallant","doi":"10.1109/IRMMW-THz.2019.8873893","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8873893","url":null,"abstract":"We report on THz metamaterials for chemical sensing fabricated on low-loss, plastic, flexible substrates. The metamaterial is bonded to a paper sheet, which is saturated with the liquid to be analysed. Liquids in contact with the metamaterial surface with different refractive indices result in a shift of the metamaterial resonant frequency. This shift in frequency can be detected by measuring its complex transmission using a THz vector network analyser, in the frequency range 0.75–1.1 THz. The sensitivity of the metamaterial is 0.0015 refractive index units for a spectral resolution of 1 GHz which is well achievable with the VNA system.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"27 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":"78672348","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.2019.8874283
Duo Xu, W. Shao, Tenglong He, Hexin Wang, Zhanliang Wang, Zhigang Lu, H. Gong, Z. Duan, Jinjun Feng, Y. Gong
In order to increase the output power of the folded waveguide (FW) Traveling wave tube (TWT), a novel Non-Central double beams (NCDB) FW-TWT is proposed in this paper. Compared with the traditional central beam (CB) FW-TWT, the NCDB-FW-TWT can double the output power without increasing the current of the single beam. A W-band NCDB-FW-TWT is designed in this paper. The PIC simulation results show that the maximal output power can reach 90 W and the 3-dB over 8.8%.
{"title":"Analysis of Folded Waveguide TWT with Non-Central Double Beams","authors":"Duo Xu, W. Shao, Tenglong He, Hexin Wang, Zhanliang Wang, Zhigang Lu, H. Gong, Z. Duan, Jinjun Feng, Y. Gong","doi":"10.1109/IRMMW-THz.2019.8874283","DOIUrl":"https://doi.org/10.1109/IRMMW-THz.2019.8874283","url":null,"abstract":"In order to increase the output power of the folded waveguide (FW) Traveling wave tube (TWT), a novel Non-Central double beams (NCDB) FW-TWT is proposed in this paper. Compared with the traditional central beam (CB) FW-TWT, the NCDB-FW-TWT can double the output power without increasing the current of the single beam. A W-band NCDB-FW-TWT is designed in this paper. The PIC simulation results show that the maximal output power can reach 90 W and the 3-dB over 8.8%.","PeriodicalId":6686,"journal":{"name":"2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"26 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":"78678856","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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