Pub Date : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370675
S. Futatsumori, N. Yonemoto, N. Shibagaki, Yousuke Sato, K. Kashima
An airport runway foreign object debris (FOD) detection system enables automatic detection of small objects which may cause damage to aircraft. We have been developing a FOD detection system based on an optically-connected 96 GHz distributed-type millimeter-wave radar. In this paper, the reflection angle dependency of 11 typical pieces of FOD on an airport runway are measured using a prototype millimeter-wave radar system located in the actual airport. The measured FOD includes a metallic cylinder, a plastic ball, a wrench, a bolt, and a metallic strip. Then, the detection probabilities of the FOD are evaluated based on the measurement results. The detection probabilities of all pieces of FOD are 100% at a distance of 250 m. In addition, the detection probability will be 100% at 500 m with a 10 dB improvement in radar sensitivity.
{"title":"Reflection Angle Dependency Evaluations of Typical Foreign Object Debris on Airport Runway Using Optically-Connected 96 GHz Millimeter-Wave Radar System","authors":"S. Futatsumori, N. Yonemoto, N. Shibagaki, Yousuke Sato, K. Kashima","doi":"10.1109/IRMMW-THz46771.2020.9370675","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370675","url":null,"abstract":"An airport runway foreign object debris (FOD) detection system enables automatic detection of small objects which may cause damage to aircraft. We have been developing a FOD detection system based on an optically-connected 96 GHz distributed-type millimeter-wave radar. In this paper, the reflection angle dependency of 11 typical pieces of FOD on an airport runway are measured using a prototype millimeter-wave radar system located in the actual airport. The measured FOD includes a metallic cylinder, a plastic ball, a wrench, a bolt, and a metallic strip. Then, the detection probabilities of the FOD are evaluated based on the measurement results. The detection probabilities of all pieces of FOD are 100% at a distance of 250 m. In addition, the detection probability will be 100% at 500 m with a 10 dB improvement in radar sensitivity.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"30 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82609293","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}
An optical tunable multi-band all-dielectric metamaterials absorber has been proposed in this paper. The absorber was made of one-dimensional all-dielectric gratings. The proposed absorber can achieve four-band and tri-band absorption with different grating depth. All the peak absorbance is higher than 90% at the resonance frequencies with the higher quality factor (Q) can reach to 12.6. Otherwise, the absorber selective absorption can be achieved by adjusting the incident pump beam. The demonstrated tunability may find potential applications in dynamic functional THz devices. Finally, the proposed absorber has a great application in spectroscopic sensing.
{"title":"Highly Sensitive detection of Optical tunable terahertz multi-band absorber based on all-dielectric grating","authors":"Lisha Yue, Yue Wang, Zijian Cui, Xiaoju Zhang, Yongqiang Zhu, Chen Yang, Xinmei Wang, Suguo Chen","doi":"10.1109/IRMMW-THz46771.2020.9370936","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370936","url":null,"abstract":"An optical tunable multi-band all-dielectric metamaterials absorber has been proposed in this paper. The absorber was made of one-dimensional all-dielectric gratings. The proposed absorber can achieve four-band and tri-band absorption with different grating depth. All the peak absorbance is higher than 90% at the resonance frequencies with the higher quality factor (Q) can reach to 12.6. Otherwise, the absorber selective absorption can be achieved by adjusting the incident pump beam. The demonstrated tunability may find potential applications in dynamic functional THz devices. Finally, the proposed absorber has a great application in spectroscopic sensing.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"11 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89070228","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370548
E. Matsubara, M. Nagai, M. Ashida
We demonstrate the coherent detection of ultrabroadband infrared pulses generated from two-color pumped air plasma in a wide spectral range using single crystal of diamond as a medium for field induced second harmonic generation.
{"title":"Gapless Sensitive Detection of Ultrabroadband Infrared Pulses Using Single Crystal of Diamond","authors":"E. Matsubara, M. Nagai, M. Ashida","doi":"10.1109/IRMMW-THz46771.2020.9370548","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370548","url":null,"abstract":"We demonstrate the coherent detection of ultrabroadband infrared pulses generated from two-color pumped air plasma in a wide spectral range using single crystal of diamond as a medium for field induced second harmonic generation.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"437 1","pages":"01-02"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83672665","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370774
G. Shu, Junzhe Deng, Jujian Lin, Lijian Chen, Zhijie Huang, Xueliang Hua, Guo Liu, Wenlong He
In this paper, the preliminary cold test of a high frequency system composed of two identical input / output couplers and a 90-period double-staggered grating waveguide is presented. A HFS without dielectric attenuators was machined by nano-CNC machining. The vector network analyzer measured results showed that the transmission coefficient $S_{21}$ and port reflection $S_{11}$ were better than −8.0 dB and −15.0 dB in the bandwidth of ∼47.2 GHz (241.4-288.6 GHz), respectively. The measured results were indicative of satisfactory machining accuracy and surface roughness and verified the adopted manufacturing technique.
{"title":"Preliminary Cold Test of a Terahertz Band Sheet Beam Travelling Wave Tube","authors":"G. Shu, Junzhe Deng, Jujian Lin, Lijian Chen, Zhijie Huang, Xueliang Hua, Guo Liu, Wenlong He","doi":"10.1109/IRMMW-THz46771.2020.9370774","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370774","url":null,"abstract":"In this paper, the preliminary cold test of a high frequency system composed of two identical input / output couplers and a 90-period double-staggered grating waveguide is presented. A HFS without dielectric attenuators was machined by nano-CNC machining. The vector network analyzer measured results showed that the transmission coefficient $S_{21}$ and port reflection $S_{11}$ were better than −8.0 dB and −15.0 dB in the bandwidth of ∼47.2 GHz (241.4-288.6 GHz), respectively. The measured results were indicative of satisfactory machining accuracy and surface roughness and verified the adopted manufacturing technique.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"47 2 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83186611","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370773
Yue Wang, Zijian Cui, Lisha Yue, Xiaoju Zhang, Yongqiang Zhu, Xiang Zhang, Z. Yao, Dachi Zhang, Cheng Ma
We have investigated the interaction of surface plasmon polariton (SPP) mode with dipole mode at terahertz perfect metamaterial absorber (PMA) consisted of a metasurface layer, a dielectric spacer layer, and a metallic ground. The dependence of SPP modes generated by PMA on the lattice constant of the unit cell was investigated. Also, high-quality-factor resonance is observed, which has been a subject of numerous investigations since an elevated quality factor is highly desirable for the practical application.
{"title":"Analysis of the coupling between surface plasmon polariton mode and dipole mode at terahertz metasurface absorber","authors":"Yue Wang, Zijian Cui, Lisha Yue, Xiaoju Zhang, Yongqiang Zhu, Xiang Zhang, Z. Yao, Dachi Zhang, Cheng Ma","doi":"10.1109/IRMMW-THz46771.2020.9370773","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370773","url":null,"abstract":"We have investigated the interaction of surface plasmon polariton (SPP) mode with dipole mode at terahertz perfect metamaterial absorber (PMA) consisted of a metasurface layer, a dielectric spacer layer, and a metallic ground. The dependence of SPP modes generated by PMA on the lattice constant of the unit cell was investigated. Also, high-quality-factor resonance is observed, which has been a subject of numerous investigations since an elevated quality factor is highly desirable for the practical application.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"18 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81177385","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370818
Ileana-Cristina Benea-Chelmus, Y. Salamin, F. F. Settembrini, Y. Fedoryshyn, W. Heni, D. Elder, L. Dalton, J. Leuthold, J. Faist
We demonstrate a fibre-coupled, fully monolithic electro-optic coherent interface on the silicon-photonics platform that senses terahertz electric fields with sub-cycle resolution by means of nonlinear coupling with photons at telecom frequencies. A strong confinement of the terahertz field to a cavity mode enables a coupling strength to sense fields as low as 20 V/m. We discuss the opportunities such platforms provide for sensing of cavity-confined terahertz states at the quantum limit.
{"title":"Electro-optic interface for ultrasensitive intra-cavity electric field sensing","authors":"Ileana-Cristina Benea-Chelmus, Y. Salamin, F. F. Settembrini, Y. Fedoryshyn, W. Heni, D. Elder, L. Dalton, J. Leuthold, J. Faist","doi":"10.1109/IRMMW-THz46771.2020.9370818","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370818","url":null,"abstract":"We demonstrate a fibre-coupled, fully monolithic electro-optic coherent interface on the silicon-photonics platform that senses terahertz electric fields with sub-cycle resolution by means of nonlinear coupling with photons at telecom frequencies. A strong confinement of the terahertz field to a cavity mode enables a coupling strength to sense fields as low as 20 V/m. We discuss the opportunities such platforms provide for sensing of cavity-confined terahertz states at the quantum limit.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"15 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87275625","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370444
Rhiannon Lees, Michael D. Cooke, C. Balocco, A. Gallant
Nail varnish and its drying properties are explored in detail using a terahertz vector network analyser in a quasioptical transmission configuration. Assessing the ‘dryness' of nail varnish through the measurement of transmitted terahertz radiation, as opposed to qualitative, and typically touch-based techniques, takes into account the non-uniform drying of the nail varnish as a function of its depth. This method can be used to assess the actual dryness of the layer overall and offer measurable parameters to quantify the drying properties of each mixture.
{"title":"Quantifying Nail Varnish Drying Using a THz Vector Network Analyser","authors":"Rhiannon Lees, Michael D. Cooke, C. Balocco, A. Gallant","doi":"10.1109/IRMMW-THz46771.2020.9370444","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370444","url":null,"abstract":"Nail varnish and its drying properties are explored in detail using a terahertz vector network analyser in a quasioptical transmission configuration. Assessing the ‘dryness' of nail varnish through the measurement of transmitted terahertz radiation, as opposed to qualitative, and typically touch-based techniques, takes into account the non-uniform drying of the nail varnish as a function of its depth. This method can be used to assess the actual dryness of the layer overall and offer measurable parameters to quantify the drying properties of each mixture.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"7 1","pages":"01-02"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84797442","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370587
Y. Xiong, T. Kashiwagi, R. Klemm, K. Kadowaki, K. Delfanazari, J. Watt
On-chip, solid-state terahertz (THz) devices based on superconducting Bi2Sr2CaCu2O8+δ(BSCCO) can coherently and continuously radiate electromagnetic waves with frequencies tunable between 100 GHz and 11 THz. Their huge frequency tunability observable by the application of an applied voltage of as small as $0 < V_{mathrm{d}mathrm{c}}(mathrm{V}) < 1.5$ covers the entire THz gap. Here, we report on a novel approach towards engineering the THz waves in such devices, with pentagonal cavities, by performing the numerical simulations/analytical calculations of the cavity resonances. We investigate the radiation of the intense and coherent THz waves in pentagonal emitters by keeping the bias feed point in the middle and changing the device geometry. We compare the results with the experiment and find a good agreement.
{"title":"Engineering the Cavity modes and Polarization in Integrated Superconducting Coherent Terahertz Emitters","authors":"Y. Xiong, T. Kashiwagi, R. Klemm, K. Kadowaki, K. Delfanazari, J. Watt","doi":"10.1109/IRMMW-THz46771.2020.9370587","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370587","url":null,"abstract":"On-chip, solid-state terahertz (THz) devices based on superconducting Bi2Sr2CaCu2O8+δ(BSCCO) can coherently and continuously radiate electromagnetic waves with frequencies tunable between 100 GHz and 11 THz. Their huge frequency tunability observable by the application of an applied voltage of as small as $0 < V_{mathrm{d}mathrm{c}}(mathrm{V}) < 1.5$ covers the entire THz gap. Here, we report on a novel approach towards engineering the THz waves in such devices, with pentagonal cavities, by performing the numerical simulations/analytical calculations of the cavity resonances. We investigate the radiation of the intense and coherent THz waves in pentagonal emitters by keeping the bias feed point in the middle and changing the device geometry. We compare the results with the experiment and find a good agreement.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90626548","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370648
Yang Luo, Jesus A. M. Calzada, Gong Chen, P. Nguyen, V. Jelic, Yu-Jui Ray Liu, D. Mildenberger, Howe R. J. Simpson, F. Hegmann
To understand and characterize the transient bias voltage induced by single-cycle terahertz (THz) pulses coupled to a scanning tunneling microscope (STM), the Bardeen tunneling model is applied to a 3-dimensional geometry of the STM junction. The simulated THz-induced tunneling current at the junction agrees well with that observed by THz-STM on a Cu(111) surface, providing a benchmark to quantify the THz-induced bias voltage at the tip-sample interface.
{"title":"Characterization of THz-induced bias voltage modulation in an STM","authors":"Yang Luo, Jesus A. M. Calzada, Gong Chen, P. Nguyen, V. Jelic, Yu-Jui Ray Liu, D. Mildenberger, Howe R. J. Simpson, F. Hegmann","doi":"10.1109/IRMMW-THz46771.2020.9370648","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370648","url":null,"abstract":"To understand and characterize the transient bias voltage induced by single-cycle terahertz (THz) pulses coupled to a scanning tunneling microscope (STM), the Bardeen tunneling model is applied to a 3-dimensional geometry of the STM junction. The simulated THz-induced tunneling current at the junction agrees well with that observed by THz-STM on a Cu(111) surface, providing a benchmark to quantify the THz-induced bias voltage at the tip-sample interface.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"94 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85256983","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 : 2020-11-08DOI: 10.1109/IRMMW-THz46771.2020.9370901
K. Endo, J. Kim, T. Suzuki
High refractive index metasurfaces can provide an accessible platform for terahertz flat optics with a variety of continuous-wave (CW) sources. We present a metasurface collimator that enhances the directivity of a terahertz CW source as a first application based on our original reflectionless metasurface with a high refractive index. Measurements confirm the directivity enhancement of 2.3 times at the far field with a resonant-tunneling diode oscillating at 0.312 THz. The proposed metasurface collimator can be incorporated in various beam shaping components and contribute to the development of terahertz applications such as wireless communication in the advanced generation 6G and imaging.
{"title":"High Refractive Index Metasurface for Terahertz Flat Optics","authors":"K. Endo, J. Kim, T. Suzuki","doi":"10.1109/IRMMW-THz46771.2020.9370901","DOIUrl":"https://doi.org/10.1109/IRMMW-THz46771.2020.9370901","url":null,"abstract":"High refractive index metasurfaces can provide an accessible platform for terahertz flat optics with a variety of continuous-wave (CW) sources. We present a metasurface collimator that enhances the directivity of a terahertz CW source as a first application based on our original reflectionless metasurface with a high refractive index. Measurements confirm the directivity enhancement of 2.3 times at the far field with a resonant-tunneling diode oscillating at 0.312 THz. The proposed metasurface collimator can be incorporated in various beam shaping components and contribute to the development of terahertz applications such as wireless communication in the advanced generation 6G and imaging.","PeriodicalId":6746,"journal":{"name":"2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"1 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90789350","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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