Pub Date : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510120
D. Hayton, J. Treuttel, J. Siles, C. Chen, R. Lin, C. Lee, E. Schlecht, I. Mehdi
In this paper we present the latest results on the performance of a compact, low power, solid-state heterodyne receiver that is being developed to target the 2.06 THz neutral oxygen [OI] line. The receiver front end features a subharmonic Schottky diode mixer that is driven by a high output all-Schottky multiplier local oscillator (LO) source. The multiplier chain consists of a 38 GHz oscillator followed by cascaded triplers at 114 GHz, 343 GHz and 1.03 THz to produce ~1 mW of LO power. The receiver is characterized for sensitivity between room temperature and 70 K. Additional data is presented demonstrating the receiver stability in terms of Allan time.
{"title":"A Compact Schottky Heterodyne Receiver for 2.06 THz Neutral Oxygen [OI]","authors":"D. Hayton, J. Treuttel, J. Siles, C. Chen, R. Lin, C. Lee, E. Schlecht, I. Mehdi","doi":"10.1109/IRMMW-THZ.2018.8510120","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510120","url":null,"abstract":"In this paper we present the latest results on the performance of a compact, low power, solid-state heterodyne receiver that is being developed to target the 2.06 THz neutral oxygen [OI] line. The receiver front end features a subharmonic Schottky diode mixer that is driven by a high output all-Schottky multiplier local oscillator (LO) source. The multiplier chain consists of a 38 GHz oscillator followed by cascaded triplers at 114 GHz, 343 GHz and 1.03 THz to produce ~1 mW of LO power. The receiver is characterized for sensitivity between room temperature and 70 K. Additional data is presented demonstrating the receiver stability in terms of Allan time.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"37 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73323707","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510400
K. Horita, Atsushi Nakanishi, K. Fujita, K. Akiyama, T. Sakamoto, Y. Goda, H. Takahashi
We present a pharmaceutical analysis method for quantitative evaluation of theophylline polymorphism, based on a terahertz difference-frequency quantum cascade laser source (THz DFG-QCL). In the experiments, samples consisting of an additive and hydrous or anhydrous theophylline were used as model drugs. The absorbance of the samples was obtained by illuminating them with a THz DFG-QCL producing broadband THz emission. While no correlation was found between the anhydrate concentration and absorbance, a significant correlation was observed for the hydrate concentration $(mathbf{R}^{2}=mathbf{0.92})$ From the results, our system successfully evaluated pseudo-polymorphism of theophylline despite requiring no complicated optical system.
{"title":"Pharmaceutical analysis using broadband terahertz quantum cascade laser sources based on difference frequency generation","authors":"K. Horita, Atsushi Nakanishi, K. Fujita, K. Akiyama, T. Sakamoto, Y. Goda, H. Takahashi","doi":"10.1109/IRMMW-THZ.2018.8510400","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510400","url":null,"abstract":"We present a pharmaceutical analysis method for quantitative evaluation of theophylline polymorphism, based on a terahertz difference-frequency quantum cascade laser source (THz DFG-QCL). In the experiments, samples consisting of an additive and hydrous or anhydrous theophylline were used as model drugs. The absorbance of the samples was obtained by illuminating them with a THz DFG-QCL producing broadband THz emission. While no correlation was found between the anhydrate concentration and absorbance, a significant correlation was observed for the hydrate concentration $(mathbf{R}^{2}=mathbf{0.92})$ From the results, our system successfully evaluated pseudo-polymorphism of theophylline despite requiring no complicated optical system.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"18 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80111766","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8509844
S. Mitryukovskiy, J. Lampin, R. Peretti
We report on the detection of a narrow absorption signature of organic crystallites (alpha-lactose monohydrate) in ice using terahertz time-domain spectroscopy.
我们报告了用太赫兹时域光谱检测冰中有机晶体(α -乳糖一水合物)的窄吸收特征。
{"title":"Detection of Organic Crystallites in Ice Using Terahertz Time-Domain Spectroscopy","authors":"S. Mitryukovskiy, J. Lampin, R. Peretti","doi":"10.1109/IRMMW-THZ.2018.8509844","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8509844","url":null,"abstract":"We report on the detection of a narrow absorption signature of organic crystallites (alpha-lactose monohydrate) in ice using terahertz time-domain spectroscopy.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"2 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82456625","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510434
M. Pan, Jean-Paul Guillet, G. Humbert, F. Fauquet, D. Lewis, P. Mounaix
In this work, we propose to use the terahertz waveguide to transport the THz signal, which allows simplifying the system set up and reducing the alignment work. In addition, the reflection-mode measurements system can be easily constructed using a double-photoconductive antenna probe. In this article, we have tested some THz waveguides with this system in order to study their propagation behaviours. Besides, we have applied it for THz imaging application. This system has more potential in diverse domain, such as non-destructive test for the semiconductor industry. We expect to further improve the system performance by taking advantage of development of THz waveguides.
{"title":"Comparative study of terahertz waveguide in reflective mode configuration","authors":"M. Pan, Jean-Paul Guillet, G. Humbert, F. Fauquet, D. Lewis, P. Mounaix","doi":"10.1109/IRMMW-THZ.2018.8510434","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510434","url":null,"abstract":"In this work, we propose to use the terahertz waveguide to transport the THz signal, which allows simplifying the system set up and reducing the alignment work. In addition, the reflection-mode measurements system can be easily constructed using a double-photoconductive antenna probe. In this article, we have tested some THz waveguides with this system in order to study their propagation behaviours. Besides, we have applied it for THz imaging application. This system has more potential in diverse domain, such as non-destructive test for the semiconductor industry. We expect to further improve the system performance by taking advantage of development of THz waveguides.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"7 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82561410","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510279
G. Hernandez-Cardoso, M. Alfaro-Gomez, S. C. Rojas-Landeros, I. Salas-Gutierrez, E. Castro-Camus
In this paper we present three-color images of the foot soles of diabetic and non-diabetic subjects. Each color represents the hydration degree of the skin within value bands that statistically separate control and diabetic patients.
{"title":"Three-color spectroscopic terahertz images as an indicator for diabetic foot syndrome deterioration","authors":"G. Hernandez-Cardoso, M. Alfaro-Gomez, S. C. Rojas-Landeros, I. Salas-Gutierrez, E. Castro-Camus","doi":"10.1109/IRMMW-THZ.2018.8510279","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510279","url":null,"abstract":"In this paper we present three-color images of the foot soles of diabetic and non-diabetic subjects. Each color represents the hydration degree of the skin within value bands that statistically separate control and diabetic patients.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"23 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81339296","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510294
S. Al-Daffaie, O. Yilmazoglu, A. Jumaah, F. Küppers
A new terahertz (THz) photomixer based on semi-insulating GaAs (SI-GaAs) with silver nanowire (Ag-NW) is for the first time demonstrated for continuous wave (CW) THz radiation. The use of the Ag-NW greatly enhanced the THz output power (‘” two order of magnitude) and compensated the large carrier lifetime of the SI-GaAs photoconductor.
{"title":"First Demonstration of Continuous Wave Terahertz Radiation from Semi-Insulating GaAs Photomixer with Nanowire","authors":"S. Al-Daffaie, O. Yilmazoglu, A. Jumaah, F. Küppers","doi":"10.1109/IRMMW-THZ.2018.8510294","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510294","url":null,"abstract":"A new terahertz (THz) photomixer based on semi-insulating GaAs (SI-GaAs) with silver nanowire (Ag-NW) is for the first time demonstrated for continuous wave (CW) THz radiation. The use of the Ag-NW greatly enhanced the THz output power (‘” two order of magnitude) and compensated the large carrier lifetime of the SI-GaAs photoconductor.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"107 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81438463","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510056
Y. Todorov, D. Palaferri, M. Jeannin, A. Mottaghizadeh, D. Gacemi, A. Vasanelli, C. Sirtori
Recent advances on infrared detectors that operate in metamaterial arrays of sub-wavelength metallic resonators are reported. The metallic metamaterial resonators have a quantitative impact on the high temperature detector performance, owe to the combination of a strong local field enhancement and an antenna effect. The latter allows collecting photons from an area that is much larger than the electrical area of the device, resulting in a strong reduction of the thermally excited detector dark current.
{"title":"Metamaterial-Enhanced Quantum Infrared Detectors","authors":"Y. Todorov, D. Palaferri, M. Jeannin, A. Mottaghizadeh, D. Gacemi, A. Vasanelli, C. Sirtori","doi":"10.1109/IRMMW-THZ.2018.8510056","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510056","url":null,"abstract":"Recent advances on infrared detectors that operate in metamaterial arrays of sub-wavelength metallic resonators are reported. The metallic metamaterial resonators have a quantitative impact on the high temperature detector performance, owe to the combination of a strong local field enhancement and an antenna effect. The latter allows collecting photons from an area that is much larger than the electrical area of the device, resulting in a strong reduction of the thermally excited detector dark current.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"9 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81682360","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510389
Qiushuo Sun, Xudong Liu, Jie Cao, R. Stantchev, Yang Zhou, Xuequan Chen, E. Parrott, N. Zhao, Emma Pickwell-MaclPhersou
Subwavelength perovskite thin films can only cause less than a l0% intensity reduction of the transmitted terahertz (THz) signal; this small dynamic range makes it difficult to track minor changes in the phonon modes. We propose a THz thin film total internal reflection (TF- TIR) spectroscopy technique to characterize photo-induced spectral changes of MAPbI3, MAPbI2.sBro.s, MAPbI2Brl and MAPbBr3. Our approach enhanced the THz responsivity of the perovskites thin films by a factor of 4 compared to THz transmission spectroscopy. The light induced the strength of the phonon modes at around 2 THz to increase after 5 min of illumination, corresponding to the enhanced stretching of the lead halide bond. After l0 min, the strength of the phonon modes at around 1 THz started to decrease, corresponding to the weakened bending of the lead halide bond. Blue shifts were observed on the resonant frequencies apart from MAPbBr3. By comparing the results of four perovskites, we conclude the perovskites that have higher iodide ratio are more unstable in the presence of light and moisture. With the support of X-ray diffraction measurements, we suggest that THz TF - TIR spectroscopy provides distinct information of vibrational kinetics of lead-halide bond in perovskites.
{"title":"Probing Photo-Induced Vibrational Kinetics in Perovskite Thin Films","authors":"Qiushuo Sun, Xudong Liu, Jie Cao, R. Stantchev, Yang Zhou, Xuequan Chen, E. Parrott, N. Zhao, Emma Pickwell-MaclPhersou","doi":"10.1109/IRMMW-THZ.2018.8510389","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510389","url":null,"abstract":"Subwavelength perovskite thin films can only cause less than a l0% intensity reduction of the transmitted terahertz (THz) signal; this small dynamic range makes it difficult to track minor changes in the phonon modes. We propose a THz thin film total internal reflection (TF- TIR) spectroscopy technique to characterize photo-induced spectral changes of MAPbI3, MAPbI2.sBro.s, MAPbI2Brl and MAPbBr3. Our approach enhanced the THz responsivity of the perovskites thin films by a factor of 4 compared to THz transmission spectroscopy. The light induced the strength of the phonon modes at around 2 THz to increase after 5 min of illumination, corresponding to the enhanced stretching of the lead halide bond. After l0 min, the strength of the phonon modes at around 1 THz started to decrease, corresponding to the weakened bending of the lead halide bond. Blue shifts were observed on the resonant frequencies apart from MAPbBr3. By comparing the results of four perovskites, we conclude the perovskites that have higher iodide ratio are more unstable in the presence of light and moisture. With the support of X-ray diffraction measurements, we suggest that THz TF - TIR spectroscopy provides distinct information of vibrational kinetics of lead-halide bond in perovskites.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"19 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78779948","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510200
Z. Tibai, Szabolcs Turnár, J. Fülöp, J. Hebling, G. Almási
Accelerating effect of THz pulse pairs on electron bunches has been investigated numerically. Electron bunches can be accelerated from rest to 80 keV using four single-cycle THz pulses, each of 0.5 mJ energy. Various electron bunch sizes and charges were investigated during the acceleration process.
{"title":"Electron acceleration by intense THz pulses","authors":"Z. Tibai, Szabolcs Turnár, J. Fülöp, J. Hebling, G. Almási","doi":"10.1109/IRMMW-THZ.2018.8510200","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510200","url":null,"abstract":"Accelerating effect of THz pulse pairs on electron bunches has been investigated numerically. Electron bunches can be accelerated from rest to 80 keV using four single-cycle THz pulses, each of 0.5 mJ energy. Various electron bunch sizes and charges were investigated during the acceleration process.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"142 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76526851","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 : 2018-09-01DOI: 10.1109/IRMMW-THZ.2018.8510212
J. Neu, Ayaka S. Hatano, E. Stone, Golo Storch, Jacob A. Spies, Scott J. Miller, C. Schmuttenmaer
Short peptides composed of only a few amino acid residues are of great interest due to their biological activity and have also been shown to exhibit catalytic activity. Identifying their dynamic $3mathbf{D}$ structure is quintessential for studying structure - activity relations. We present temperature-dependent THz spectroscopy of tetrameric peptide catalysts. These THz spectra, supported by DFT calculations, allow us to distinguish structural features of different peptides.
{"title":"Identifying Peptide Structures with THz Spectroscopy","authors":"J. Neu, Ayaka S. Hatano, E. Stone, Golo Storch, Jacob A. Spies, Scott J. Miller, C. Schmuttenmaer","doi":"10.1109/IRMMW-THZ.2018.8510212","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2018.8510212","url":null,"abstract":"Short peptides composed of only a few amino acid residues are of great interest due to their biological activity and have also been shown to exhibit catalytic activity. Identifying their dynamic $3mathbf{D}$ structure is quintessential for studying structure - activity relations. We present temperature-dependent THz spectroscopy of tetrameric peptide catalysts. These THz spectra, supported by DFT calculations, allow us to distinguish structural features of different peptides.","PeriodicalId":6653,"journal":{"name":"2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)","volume":"84 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75971408","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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