Pub Date : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327835
Xianbin Yu, B. Vidal, M. Galili, T. Morioka, P. Jepsen, L. Oxenløwe
We experimentally characterize a ultrabroadband terahertz (THz) impulse radio system with up to 10 GHz repetition rate. THz generation and radiation are realized in an antenna-integrated uni-traveling-carrier photodiode (UTC-PD), and THz reception is implemented based on photoconductive sampling by using a photoconductive antenna (PCA). We analyze the performance in terms of bandwidth and the features of the THz pulses. A 15 dB bandwidth of 1 THz confirms that this THz impulse system has a great potential of supporting ultrafast data rates, eventually for Terabit wireless communication era.
{"title":"Experimental characterization of extremely broadband THz impulse radio communication systems","authors":"Xianbin Yu, B. Vidal, M. Galili, T. Morioka, P. Jepsen, L. Oxenløwe","doi":"10.1109/IRMMW-THZ.2015.7327835","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327835","url":null,"abstract":"We experimentally characterize a ultrabroadband terahertz (THz) impulse radio system with up to 10 GHz repetition rate. THz generation and radiation are realized in an antenna-integrated uni-traveling-carrier photodiode (UTC-PD), and THz reception is implemented based on photoconductive sampling by using a photoconductive antenna (PCA). We analyze the performance in terms of bandwidth and the features of the THz pulses. A 15 dB bandwidth of 1 THz confirms that this THz impulse system has a great potential of supporting ultrafast data rates, eventually for Terabit wireless communication era.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"20 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78860471","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327848
S. Pandey, Barun Gupta, A. Nahata
We present the first experimental demonstration of spatial localization (Anderson localization) of terahertz waves in plasmonic structures. The effect is brought upon by inclusion of disorder in a one dimensional plasmonic lattice. We discuss the effect of disorder on the propagation properties of the waveguide, the appearance of new modes beyond the stop band, and their transport properties. We also measure the spatial properties of the localized mode and compare the localization length to other experimental demonstrations. The results are consistent with prior published theoretical works.
{"title":"Anderson localization in terahertz plasmonic waveguides","authors":"S. Pandey, Barun Gupta, A. Nahata","doi":"10.1109/IRMMW-THZ.2015.7327848","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327848","url":null,"abstract":"We present the first experimental demonstration of spatial localization (Anderson localization) of terahertz waves in plasmonic structures. The effect is brought upon by inclusion of disorder in a one dimensional plasmonic lattice. We discuss the effect of disorder on the propagation properties of the waveguide, the appearance of new modes beyond the stop band, and their transport properties. We also measure the spatial properties of the localized mode and compare the localization length to other experimental demonstrations. The results are consistent with prior published theoretical works.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"94 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84294950","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327562
M. Yu, W. Xu, D. An, M. Y. Zhang, Y. Xu, J. Chen, P. Wu
The heart of the integrated antenna and detector is the matching network between them. In this paper, four type antennas for matching the small impedances of high temperature superconducting terahertz detectors at 650GHz are proposed. And the coupling efficiency has improved for high temperature superconducting YBa2Cu2Ox (YBCO) Josephson junction detector with these antennas. Meanwhile, the array structures are designed to harvest more terahertz energy from the space. The resonant property and the coupling efficiency are measured by the terahertz time-domain spectroscopy (THz - TDS) system.
{"title":"Design of planar antennas for the superconducting terahertz detector","authors":"M. Yu, W. Xu, D. An, M. Y. Zhang, Y. Xu, J. Chen, P. Wu","doi":"10.1109/IRMMW-THZ.2015.7327562","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327562","url":null,"abstract":"The heart of the integrated antenna and detector is the matching network between them. In this paper, four type antennas for matching the small impedances of high temperature superconducting terahertz detectors at 650GHz are proposed. And the coupling efficiency has improved for high temperature superconducting YBa2Cu2Ox (YBCO) Josephson junction detector with these antennas. Meanwhile, the array structures are designed to harvest more terahertz energy from the space. The resonant property and the coupling efficiency are measured by the terahertz time-domain spectroscopy (THz - TDS) system.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"9 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87261491","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327792
Borwen You, Wen-jie Cheng, Ja-Yu Lu, T. Liu, T. Hattori
Metal rod array (MRA) are presented as the microstructured cladding of a rectangle channel waveguide to guide terahertz (THz) waves. The microstructure cladding is critical to modify the waveguide loss, dispersion, resonance, and pass-band. THz-field resonance and the corresponding modal field are taken as examples to express that the MRA period can be tailored for engineering the waveguide. MRA is agreed as a plasmonic metalmaterial, possessing spoof plasma frequency and dependent on the MRA geometry. The case of THz-field resonance inside the waveguide channel is significant to mimic “plasmonic resonance” in THz region that does not appear in natural metals.
{"title":"Terahertz plasmonic waveguides based on a microstructure of metal rod array","authors":"Borwen You, Wen-jie Cheng, Ja-Yu Lu, T. Liu, T. Hattori","doi":"10.1109/IRMMW-THZ.2015.7327792","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327792","url":null,"abstract":"Metal rod array (MRA) are presented as the microstructured cladding of a rectangle channel waveguide to guide terahertz (THz) waves. The microstructure cladding is critical to modify the waveguide loss, dispersion, resonance, and pass-band. THz-field resonance and the corresponding modal field are taken as examples to express that the MRA period can be tailored for engineering the waveguide. MRA is agreed as a plasmonic metalmaterial, possessing spoof plasma frequency and dependent on the MRA geometry. The case of THz-field resonance inside the waveguide channel is significant to mimic “plasmonic resonance” in THz region that does not appear in natural metals.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"137 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90630591","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}
Research on high performance terahertz (THz) detector is essential for promoting the application of THz science and technology. Lithium tantalate crystal (LiTaO3) was used to fabricate the THz detector in this paper. Polishing process were used to reduce the thickness of LiTaO3 crystal slice obtained the area of 2mm×2mm×10μm LiTaO3 wafer pyroelectric coefficient of 4.7×10-4Cm-2K-1 by chemical mechanical polishing techniques. The THz responsivity for detector tested by lock in amplifier reaches 8.38×104V/W and the lowest noise equivalent power value (NEP) reaches 3.25×10-12W at 20Hz operating frequency use 2.52THz radiation, which is suitable for THz imaging application. Meanwhile it provides a feasible approach for fabricating high responsivity THz detector.
{"title":"High performance THz detector based on ultra-thin LiTaO3 crystal","authors":"Zhiqing Liang, Ziji Liu, Tao Wang, Yadong Jiang, Xing Zheng, Zehua Huang, Xuefei Wu","doi":"10.1109/IRMMW-THZ.2015.7327772","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327772","url":null,"abstract":"Research on high performance terahertz (THz) detector is essential for promoting the application of THz science and technology. Lithium tantalate crystal (LiTaO<sub>3</sub>) was used to fabricate the THz detector in this paper. Polishing process were used to reduce the thickness of LiTaO<sub>3</sub> crystal slice obtained the area of 2mm×2mm×10μm LiTaO<sub>3</sub> wafer pyroelectric coefficient of 4.7×10<sup>-4</sup>Cm<sup>-2</sup>K<sup>-1</sup> by chemical mechanical polishing techniques. The THz responsivity for detector tested by lock in amplifier reaches 8.38×10<sup>4</sup>V/W and the lowest noise equivalent power value (NEP) reaches 3.25×10<sup>-12</sup>W at 20Hz operating frequency use 2.52THz radiation, which is suitable for THz imaging application. Meanwhile it provides a feasible approach for fabricating high responsivity THz detector.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"7 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79270675","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327831
N. Hunter, A. Mayorov, C. Wood, C. Russell, M. Rosamond, L. Li, E. Linfield, A. Davies, J. Cunningham
We present an on-chip time domain terahertz (TD-THz) system in which picosecond pulses are generated in low-temperature-grown gallium arsenide (LT-GaAs) and detected in graphene. The detected pulses were found to vary in amplitude, full width at half maximum (FWHM), and DC offset when sampled optically at different locations along a 50-μm-long graphene photoconductive (PC) detector. The results demonstrate the importance of detection location and switch design in graphene-based on-chip PC detectors.
{"title":"Spatially resolved on-chip picosecond pulse detection using graphene","authors":"N. Hunter, A. Mayorov, C. Wood, C. Russell, M. Rosamond, L. Li, E. Linfield, A. Davies, J. Cunningham","doi":"10.1109/IRMMW-THZ.2015.7327831","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327831","url":null,"abstract":"We present an on-chip time domain terahertz (TD-THz) system in which picosecond pulses are generated in low-temperature-grown gallium arsenide (LT-GaAs) and detected in graphene. The detected pulses were found to vary in amplitude, full width at half maximum (FWHM), and DC offset when sampled optically at different locations along a 50-μm-long graphene photoconductive (PC) detector. The results demonstrate the importance of detection location and switch design in graphene-based on-chip PC detectors.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"29 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79234115","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327647
T. Kurabayashi, Takuya Inoue, Haruka Iguchi, S. Yodokawa, Takeshi Ando, S. Kosaka
Absorption spectra of cellulosic fibers in THz region show discriminative absorptions which are derived from crystallized cellulose, when we prepare the samples by cutting at a length of about 0.1-0.2 mm. The blending ratio of two different kinds of fibers has been examined by using this method, and the spectra were analyzed by an analysis of principal component as a multiple classification analysis after the first derivation of the spectra. The result means the blending ratio can be identified with considerable accuracy at a few percent of reliability.
{"title":"Identification of fabric fibers and their blending ratio by terahertz spectroscopy","authors":"T. Kurabayashi, Takuya Inoue, Haruka Iguchi, S. Yodokawa, Takeshi Ando, S. Kosaka","doi":"10.1109/IRMMW-THZ.2015.7327647","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327647","url":null,"abstract":"Absorption spectra of cellulosic fibers in THz region show discriminative absorptions which are derived from crystallized cellulose, when we prepare the samples by cutting at a length of about 0.1-0.2 mm. The blending ratio of two different kinds of fibers has been examined by using this method, and the spectra were analyzed by an analysis of principal component as a multiple classification analysis after the first derivation of the spectra. The result means the blending ratio can be identified with considerable accuracy at a few percent of reliability.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"115 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85393610","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327455
Yabin Zhang, Zhanliang Wang, Y. Gong, Jinjun Feng
An electric coupling input structure has been proposed for a Ka-band relativistic sheet electron beam traveling wave tube (TWT). This kind of new input structure is easily to be realized and can facilitate the experiment process very much. The results show that this kind of new structure has a good transmission characteristics. The reflection coefficient S11 is less than -25dB from 30GHz to 40GHz and the transmission coefficient S21 is bigger than 0.05dB at the same frequency range. The Ka-band relativistic sheet electron beam TWT with the new kind of input structure, can produce more than a MW pulse radiation.
{"title":"A Ka-band relativistic sheet electron beam traveling wave tube using electric coupling input structure","authors":"Yabin Zhang, Zhanliang Wang, Y. Gong, Jinjun Feng","doi":"10.1109/IRMMW-THZ.2015.7327455","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327455","url":null,"abstract":"An electric coupling input structure has been proposed for a Ka-band relativistic sheet electron beam traveling wave tube (TWT). This kind of new input structure is easily to be realized and can facilitate the experiment process very much. The results show that this kind of new structure has a good transmission characteristics. The reflection coefficient S11 is less than -25dB from 30GHz to 40GHz and the transmission coefficient S21 is bigger than 0.05dB at the same frequency range. The Ka-band relativistic sheet electron beam TWT with the new kind of input structure, can produce more than a MW pulse radiation.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"16 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75465487","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327665
G. Ducournau, P. Szriftgiser, D. Bacquet, E. Peytavit, M. Zaknoune, R. Kassi, J. Lampin
We report on THz communication system using vectorial modulations schemes above 500 GHz. Using schottky-based electronic technologies at 588 GHz, potentialities of high-level multi-carrier modulation schemes for wireless links are analyzed. The wireless link is composed of an emitter with sub-harmonic mixer for up-conversion from 294 to 588 GHz and carrier modulation. A pumped zero-bias detector is used at reception. Mono-carrier signaling is realized using for up to 32-symbol modulation scheme and multi-carrier THz transmission is also achieved using several modulation schemes in parallel.
{"title":"QAM-32/0.588 THz communication using electronic Schottky transceivers","authors":"G. Ducournau, P. Szriftgiser, D. Bacquet, E. Peytavit, M. Zaknoune, R. Kassi, J. Lampin","doi":"10.1109/IRMMW-THZ.2015.7327665","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327665","url":null,"abstract":"We report on THz communication system using vectorial modulations schemes above 500 GHz. Using schottky-based electronic technologies at 588 GHz, potentialities of high-level multi-carrier modulation schemes for wireless links are analyzed. The wireless link is composed of an emitter with sub-harmonic mixer for up-conversion from 294 to 588 GHz and carrier modulation. A pumped zero-bias detector is used at reception. Mono-carrier signaling is realized using for up to 32-symbol modulation scheme and multi-carrier THz transmission is also achieved using several modulation schemes in parallel.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"92 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90878922","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 : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327410
K. Jacobs, B. Stevens, O. Wada, T. Mukai, D. Ohnishi, R. Hogg
We report on a dual-pass high current density InGaAs/AlAs/InP resonant tunnelling diode (RTD) terahertz (THz) emitter. Our dual-pass technique reduces overall fabrication complexity, improves the reproducibility for creating low resistance ohmic contacts, and allows accurate control over the final device area. This has been made possible by measuring the RTD current-voltage (I-V) characteristic during the fabrication process and defining both contact electrodes at the start of the fabrication. We extract information about the RTD performance using this method and demonstrate fundamental room temperature emission at 0.35 THz.
{"title":"A dual-pass high current density resonant tunnelling diode terahertz emitter","authors":"K. Jacobs, B. Stevens, O. Wada, T. Mukai, D. Ohnishi, R. Hogg","doi":"10.1109/IRMMW-THZ.2015.7327410","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327410","url":null,"abstract":"We report on a dual-pass high current density InGaAs/AlAs/InP resonant tunnelling diode (RTD) terahertz (THz) emitter. Our dual-pass technique reduces overall fabrication complexity, improves the reproducibility for creating low resistance ohmic contacts, and allows accurate control over the final device area. This has been made possible by measuring the RTD current-voltage (I-V) characteristic during the fabrication process and defining both contact electrodes at the start of the fabrication. We extract information about the RTD performance using this method and demonstrate fundamental room temperature emission at 0.35 THz.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"42 Suppl 18 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2015-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91233457","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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