Pub Date : 2021-08-29DOI: 10.1109/IRMMW-THz50926.2021.9567290
C. Donaldson, P. Macinnes, C. Robertson, L. Zhang, C. Whyte
This paper presents a numerical investigation of alternate gyrotron Traveling Wave Amplifier (gyro-TWA) configurations for increased gain. Previous experimental results showed a maximum stable gain of 37 dB over the frequency range 90-96 GHz. These results were limited in bandwidth by the input power from the solid-state pre-amplifier. The simplest way to mitigate the limited input power available is to increase amplifier gain. Doing so without inducing instability requires the introduction of losses to the RF circuit. We present PIC simulations contrasting a range of new designs combining two gain stages and lossy elements with results for the single section design presented in our earlier experimental program.
{"title":"Investigations of a high gain W-band gyro-TWA","authors":"C. Donaldson, P. Macinnes, C. Robertson, L. Zhang, C. Whyte","doi":"10.1109/IRMMW-THz50926.2021.9567290","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567290","url":null,"abstract":"This paper presents a numerical investigation of alternate gyrotron Traveling Wave Amplifier (gyro-TWA) configurations for increased gain. Previous experimental results showed a maximum stable gain of 37 dB over the frequency range 90-96 GHz. These results were limited in bandwidth by the input power from the solid-state pre-amplifier. The simplest way to mitigate the limited input power available is to increase amplifier gain. Doing so without inducing instability requires the introduction of losses to the RF circuit. We present PIC simulations contrasting a range of new designs combining two gain stages and lossy elements with results for the single section design presented in our earlier experimental program.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"95 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":"79625583","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-THz50926.2021.9567334
Qiang Niu, Chenyu Bai, Yuping Yang
The new type of coronavirus pneumonia (SARS-CoV-2) has caused the cumulative number of confirmed diagnoses worldwide to exceed 1.7 Billion, and it has led to heavy damage to all aspects of the world. Therefore, it is crucial to detect SARS-CoV-2 with high sensitivity, free-label, and rapid quantification. Here, a terahertz (THz) metamaterial (MM) biosensor was designed and has achieved a high-sensitivity and quantitative detection of trace SARS-CoV-2 S1 protein.
{"title":"Detection of SARS-CoV-2 S1 protein using terahertz meta-biosensor","authors":"Qiang Niu, Chenyu Bai, Yuping Yang","doi":"10.1109/IRMMW-THz50926.2021.9567334","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567334","url":null,"abstract":"The new type of coronavirus pneumonia (SARS-CoV-2) has caused the cumulative number of confirmed diagnoses worldwide to exceed 1.7 Billion, and it has led to heavy damage to all aspects of the world. Therefore, it is crucial to detect SARS-CoV-2 with high sensitivity, free-label, and rapid quantification. Here, a terahertz (THz) metamaterial (MM) biosensor was designed and has achieved a high-sensitivity and quantitative detection of trace SARS-CoV-2 S1 protein.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"75 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":"79691566","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-THz50926.2021.9567624
Magnetic materials are increasingly garnering attention for modern technological applications because of their magnetoelectric properties, which can be modified by external magnetic fields, temperature, and pressure. To utilize magnetic solids in advanced applications, accurate descriptions and details about temperature-dependent spin ordering (antiferromagnetic, ferromagnetic and paramagnetic phases) within the magnetic materials must be understood with atomic-level precision. Low-frequency vibrational dynamics can be used to investigate ground state structure-property relationship of magnetic structures, as demonstrated here for FePO4.
{"title":"Determining the Magnetic Configuration of Crystalline Solids with Terahertz Spectroscopy","authors":"","doi":"10.1109/IRMMW-THz50926.2021.9567624","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567624","url":null,"abstract":"Magnetic materials are increasingly garnering attention for modern technological applications because of their magnetoelectric properties, which can be modified by external magnetic fields, temperature, and pressure. To utilize magnetic solids in advanced applications, accurate descriptions and details about temperature-dependent spin ordering (antiferromagnetic, ferromagnetic and paramagnetic phases) within the magnetic materials must be understood with atomic-level precision. Low-frequency vibrational dynamics can be used to investigate ground state structure-property relationship of magnetic structures, as demonstrated here for FePO4.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"2 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":"83344553","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-THz50926.2021.9567241
N. Balal, V. Bratman, Y. Lurie, E. Magory
A possibility to generate wideband terahertz pulses of Coherent Spontaneous Radiation with energies of hundreds of microjoules and a relatively high efficiency in regimes close to group synchronism of electrons with the mode of a circular waveguide has been demonstrated in simulations. As a magnetic system of the THz source providing a large undulator parameter K> 1, it is proposed to use the simplest helical undulator formed by several permanently magnetized ferromagnetic helices. The use of a preliminary energetic chirp of particles and stabilization of the bunch in the field of the emitted electromagnetic pulse makes it possible to mitigate the effects of Coulomb repulsion of particles and to increase the length of the effective interaction of a dense bunch with the field of the operating mode.
{"title":"Broadband Terahertz Undulator Radiation from Short Electron Bunches into the Dominant Mode of an Oversized Waveguide","authors":"N. Balal, V. Bratman, Y. Lurie, E. Magory","doi":"10.1109/IRMMW-THz50926.2021.9567241","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567241","url":null,"abstract":"A possibility to generate wideband terahertz pulses of Coherent Spontaneous Radiation with energies of hundreds of microjoules and a relatively high efficiency in regimes close to group synchronism of electrons with the mode of a circular waveguide has been demonstrated in simulations. As a magnetic system of the THz source providing a large undulator parameter K> 1, it is proposed to use the simplest helical undulator formed by several permanently magnetized ferromagnetic helices. The use of a preliminary energetic chirp of particles and stabilization of the bunch in the field of the emitted electromagnetic pulse makes it possible to mitigate the effects of Coulomb repulsion of particles and to increase the length of the effective interaction of a dense bunch with the field of the operating mode.","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":"83365132","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-THz50926.2021.9567141
Xuan Ding, Bo Yu, Y. Ye, Hai-xia Yu, Zhiwei Xu, Q. Jane Gu
A full-duplex sub-THz interconnect based on Frequency Division Duplex (FDD) scheme is proposed for high data-rate and bandwidth-density chip-to-chip communications. The system consists of a dual-band transmitter (TX), receiver (RX), and Si dielectric waveguide (DWG) channel that provides low in-band insertion loss (IL) and high isolation in the two adjacent frequency bands. A full-duplex measurement was set up with Pseudo Random Binary Sequence (PRBS) length of 231-1. With the Bit Error Rates (BER) < 1×10−12, Channel 1 at 140 GHz and Channel 2 at 180 GHz achieve simultaneous On-Off Keying (OOK) modulated data rates of 12.3 Gb/s and 10.3 Gb/s, respectively. This full duplex interconnect system achieves the energy efficiency of 1.58 pJ/b and the record bandwidth density of 150.7 Gb/s/mm2.
{"title":"An FDD-based Full-Duplex Sub-THz Interconnect with Data-rate of 22.6 Gb/s and Energy-Efficiency of 1.58pJ/bit","authors":"Xuan Ding, Bo Yu, Y. Ye, Hai-xia Yu, Zhiwei Xu, Q. Jane Gu","doi":"10.1109/IRMMW-THz50926.2021.9567141","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567141","url":null,"abstract":"A full-duplex sub-THz interconnect based on Frequency Division Duplex (FDD) scheme is proposed for high data-rate and bandwidth-density chip-to-chip communications. The system consists of a dual-band transmitter (TX), receiver (RX), and Si dielectric waveguide (DWG) channel that provides low in-band insertion loss (IL) and high isolation in the two adjacent frequency bands. A full-duplex measurement was set up with Pseudo Random Binary Sequence (PRBS) length of 231-1. With the Bit Error Rates (BER) < 1×10−12, Channel 1 at 140 GHz and Channel 2 at 180 GHz achieve simultaneous On-Off Keying (OOK) modulated data rates of 12.3 Gb/s and 10.3 Gb/s, respectively. This full duplex interconnect system achieves the energy efficiency of 1.58 pJ/b and the record bandwidth density of 150.7 Gb/s/mm2.","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":"83527202","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-THz50926.2021.9567614
Vanessa Fenlon, Michael D. Cooke, J. Mayock, A. Gallant, C. Balocco
THz antennas have been designed using a bespoke genetic algorithm. A patch antenna designed using this technique was found to have a mean improvement of 7.58 dB on a reference patch between 0.1 THz and 5.0 THz. This paper presents the testing of this antenna between 0.8 THz and 1.0 THz and subsequent verification of the algorithm.
{"title":"Verification of THz genetic algorithm using a VNA","authors":"Vanessa Fenlon, Michael D. Cooke, J. Mayock, A. Gallant, C. Balocco","doi":"10.1109/IRMMW-THz50926.2021.9567614","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567614","url":null,"abstract":"THz antennas have been designed using a bespoke genetic algorithm. A patch antenna designed using this technique was found to have a mean improvement of 7.58 dB on a reference patch between 0.1 THz and 5.0 THz. This paper presents the testing of this antenna between 0.8 THz and 1.0 THz and subsequent verification of the algorithm.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"25 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":"88625526","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-THz50926.2021.9567018
Chunguang Ma, Jun Dong, Yuyu Zhao, Ke Xiao
A broadband rectangular waveguide-to-coplanar waveguide with ground transition for large-chip-width substrate operating within terahertz frequencies (230-320GHz) is demonstrated in this work. This transition adopts a dipole antenna with butterfly-shaped coupling branches. This compact transition reduces parasitic effects by wire bonding and is suitable for direct integration with terahertz monolithic integrated circuits. The transition was designed based on a 50 μm thick InP technology and designed for standard waveguide (432×864 μm). The simulated results show that the bandwidth is as wide as 90 GHz, and the in-band return loss is better than 14 dB.
{"title":"Broadband Waveguid-to-CPWG Transition With Butterfly-shaped Dipole","authors":"Chunguang Ma, Jun Dong, Yuyu Zhao, Ke Xiao","doi":"10.1109/IRMMW-THz50926.2021.9567018","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567018","url":null,"abstract":"A broadband rectangular waveguide-to-coplanar waveguide with ground transition for large-chip-width substrate operating within terahertz frequencies (230-320GHz) is demonstrated in this work. This transition adopts a dipole antenna with butterfly-shaped coupling branches. This compact transition reduces parasitic effects by wire bonding and is suitable for direct integration with terahertz monolithic integrated circuits. The transition was designed based on a 50 μm thick InP technology and designed for standard waveguide (432×864 μm). The simulated results show that the bandwidth is as wide as 90 GHz, and the in-band return loss is better than 14 dB.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"63 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":"87225055","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-THz50926.2021.9567270
S. Heidtfeld, R. Adam, T. Kubota, K. Takanashi, S. Suga, D. Cao, C. Greb, F. Wang, C. Schmitz-Antoniak, D. Bürgler, G. Chen, I. Komissarov, R. Sobolewski, C. Schneider
We generated electro magnetic transients with a frequency content up to the terahertz regime from Co2Fe0.4Mn0.6Si Heusler alloy/heavy-metal bilayers by excitation with fs-laser pulses. We ascribe the generation process to the inverse spin Hall effect. We compared our results with ferromagnetic resonance measurements to investigate the efficiency of interfacial spin currents. We observed that the efficiency of the THz radiation can be described by the spin-orbit coupling, nonetheless the interface properties play an important role.
{"title":"Generation of Terahertz Transients from Co2Fe0.4Mn0.6Si Heusler alloy/Heavy-Metal Bilayers","authors":"S. Heidtfeld, R. Adam, T. Kubota, K. Takanashi, S. Suga, D. Cao, C. Greb, F. Wang, C. Schmitz-Antoniak, D. Bürgler, G. Chen, I. Komissarov, R. Sobolewski, C. Schneider","doi":"10.1109/IRMMW-THz50926.2021.9567270","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567270","url":null,"abstract":"We generated electro magnetic transients with a frequency content up to the terahertz regime from Co2Fe0.4Mn0.6Si Heusler alloy/heavy-metal bilayers by excitation with fs-laser pulses. We ascribe the generation process to the inverse spin Hall effect. We compared our results with ferromagnetic resonance measurements to investigate the efficiency of interfacial spin currents. We observed that the efficiency of the THz radiation can be described by the spin-orbit coupling, nonetheless the interface properties play an important role.","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":"84721700","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-THz50926.2021.9566960
Shoei Tetsukawa, Shuang Liu, V. Mag-usara, V. C. Agulto, M. Kohda, Ryan Thompson, H. Gamou, Ye Du, S. Karube, J. Nitta, M. Tani, M. Asakawa, M. Nakajima
Spintronic terahertz emitters are terahertz wave emitting elements that utilize spin currents. We have produced Pt/Co spintronic terahertz emitters by epitaxial growth of Pt and Co layers on MgO(110) substrate. The azimuthal angle dependence of Pt/Co spintronic terahertz emission shows characteristic dependences due to magnetic anisotropy. The terahertz emission is useful to evaluate the magnetic anisotropy in spintronic thin films.
{"title":"Spintronic Terahertz Emission and Magnetic Anisotropy of Epitaxial Platinum Heterostructures on MgO(110) Substrate","authors":"Shoei Tetsukawa, Shuang Liu, V. Mag-usara, V. C. Agulto, M. Kohda, Ryan Thompson, H. Gamou, Ye Du, S. Karube, J. Nitta, M. Tani, M. Asakawa, M. Nakajima","doi":"10.1109/IRMMW-THz50926.2021.9566960","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9566960","url":null,"abstract":"Spintronic terahertz emitters are terahertz wave emitting elements that utilize spin currents. We have produced Pt/Co spintronic terahertz emitters by epitaxial growth of Pt and Co layers on MgO(110) substrate. The azimuthal angle dependence of Pt/Co spintronic terahertz emission shows characteristic dependences due to magnetic anisotropy. The terahertz emission is useful to evaluate the magnetic anisotropy in spintronic thin films.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"76 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":"85159714","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-THz50926.2021.9567473
Shuchao Yang, Tao Xu, Han Bao, X. Jia, La-bao Zhang, L. Kang, Jian Chen, Peiheng Wu
We have fabricated MoSi thin films by magnetron sputtering. The zero resistance superconducting transition temperature of 5 nm thin films reaches 4.1 K. Then, by optimizing lithography conditions, micron lines were prepared by laser direct writing lithography. The line width is from1.0 μm to 2.0 μm of the detection region, which the micro-wires have high uniformity in a large area, and the largest photosensitive area is up to 1000×1000 μm2. we preliminarily characterize the performance of the detectors, including I-V characteristics, dark counts, and photon counts rate.
{"title":"Large-area Superconducting Micro-wire Single-photon Detectors Prepared by Laser Direct Writing Lithography","authors":"Shuchao Yang, Tao Xu, Han Bao, X. Jia, La-bao Zhang, L. Kang, Jian Chen, Peiheng Wu","doi":"10.1109/IRMMW-THz50926.2021.9567473","DOIUrl":"https://doi.org/10.1109/IRMMW-THz50926.2021.9567473","url":null,"abstract":"We have fabricated MoSi thin films by magnetron sputtering. The zero resistance superconducting transition temperature of 5 nm thin films reaches 4.1 K. Then, by optimizing lithography conditions, micron lines were prepared by laser direct writing lithography. The line width is from1.0 μm to 2.0 μm of the detection region, which the micro-wires have high uniformity in a large area, and the largest photosensitive area is up to 1000×1000 μm2. we preliminarily characterize the performance of the detectors, including I-V characteristics, dark counts, and photon counts rate.","PeriodicalId":6852,"journal":{"name":"2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz)","volume":"9 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2021-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82006328","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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