Pub Date : 2015-11-12DOI: 10.1109/IRMMW-THZ.2015.7327431
Jun Gou, Jun Wang, Xing Zheng, D. Gu, Yadong Jiang
Nanostructured NiCr thin film was prepared by a combination of magnetron sputtering and reactive ion etching (RIE) in 80 × 60 uncooled infrared focal plane arrays (IRFPA). The surface morphologies and THz absorption characteristics of the IRFPAs were tested with NiCr absorption layers prepared by magnetron sputtering and the combined process respectively. The tests suggested that THz absorption could be effectively enhanced by RIE processes applied to the dielectric substrate and NiCr film, which increased the specific surface area of NiCr absorption film by generating nanoscale structures on upper and lower surfaces.
{"title":"Preparation of nanostructured NiCr film as a terahertz absorption layer by magnetron sputtering and RIE","authors":"Jun Gou, Jun Wang, Xing Zheng, D. Gu, Yadong Jiang","doi":"10.1109/IRMMW-THZ.2015.7327431","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327431","url":null,"abstract":"Nanostructured NiCr thin film was prepared by a combination of magnetron sputtering and reactive ion etching (RIE) in 80 × 60 uncooled infrared focal plane arrays (IRFPA). The surface morphologies and THz absorption characteristics of the IRFPAs were tested with NiCr absorption layers prepared by magnetron sputtering and the combined process respectively. The tests suggested that THz absorption could be effectively enhanced by RIE processes applied to the dielectric substrate and NiCr film, which increased the specific surface area of NiCr absorption film by generating nanoscale structures on upper and lower surfaces.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"13 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":"83372078","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.2015.7327610
D. Headland, P. Thurgood, D. Stavrevski, W. Withayachumnankul, D. Abbott, M. Bhaskaran, S. Sriram
A method of reducing the dielectric loss of poly-dimethylsiloxane (PDMS) in the terahertz range with dopants is presented. Samples of PDMS are doped with varied concentrations of polytetrafluoroethylene (PTFE) micro-particles, and characterized with terahertz time domain spectroscopy (THz-TDS) in order to extract their material properties. It is found that controlled doping can significantly reduce dielectric loss in PDMS at terahertz frequencies, and for the sample with highest dopant concentration, a 15.3% average reduction in loss tangent is demonstrated over a range from 0.3 to 1 THz. Measured material properties are compared with the Lichtenecker logarithmic mixture formula, and approximate agreement is attained.
{"title":"Modified elastomeric polymers for loss reduction in the terahertz range","authors":"D. Headland, P. Thurgood, D. Stavrevski, W. Withayachumnankul, D. Abbott, M. Bhaskaran, S. Sriram","doi":"10.1109/IRMMW-THZ.2015.7327610","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327610","url":null,"abstract":"A method of reducing the dielectric loss of poly-dimethylsiloxane (PDMS) in the terahertz range with dopants is presented. Samples of PDMS are doped with varied concentrations of polytetrafluoroethylene (PTFE) micro-particles, and characterized with terahertz time domain spectroscopy (THz-TDS) in order to extract their material properties. It is found that controlled doping can significantly reduce dielectric loss in PDMS at terahertz frequencies, and for the sample with highest dopant concentration, a 15.3% average reduction in loss tangent is demonstrated over a range from 0.3 to 1 THz. Measured material properties are compared with the Lichtenecker logarithmic mixture formula, and approximate agreement is attained.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"347 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":"77783847","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.2015.7327932
Q. Yao, Dong Liu, Zhenhui Lin, W. Duan, Jing Li, Z. Lou, S. Shi, H. Maezawa, S. Paine
We introduced a dual-THz-band SIS (Superconductor- Insulator-Superconductor) heterodyne radiometer system which is under developing for the atmospheric profiling synthetic observation system project (APSOS). This THz system is intended to have a durable and compact design to meet the challenging requirements of remote operation at Tibetan Plateau. The system as well as its major components such as antenna tipping, quasi-optics, cryogenics, SIS mixers and FFTS backend will be discussed thoroughly. Some scientific simulation focusing on the atmospheric profiling components at THz bands will also be investigated.
{"title":"Atmospheric profiling synthetic observation system at THz wave band","authors":"Q. Yao, Dong Liu, Zhenhui Lin, W. Duan, Jing Li, Z. Lou, S. Shi, H. Maezawa, S. Paine","doi":"10.1109/IRMMW-THZ.2015.7327932","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327932","url":null,"abstract":"We introduced a dual-THz-band SIS (Superconductor- Insulator-Superconductor) heterodyne radiometer system which is under developing for the atmospheric profiling synthetic observation system project (APSOS). This THz system is intended to have a durable and compact design to meet the challenging requirements of remote operation at Tibetan Plateau. The system as well as its major components such as antenna tipping, quasi-optics, cryogenics, SIS mixers and FFTS backend will be discussed thoroughly. Some scientific simulation focusing on the atmospheric profiling components at THz bands will also be investigated.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"117 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":"81306410","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.2015.7327416
T. Bowman, Yuhao Wu, A. Walter, J. Gauch, M. El-Shenawee, Lucas K. Campbell
This research represents experimental use of a pulsed terahertz time-domain imaging system to obtain time of flight (in-depth) reflection scans from three-dimensional ex-vivo breast cancer tumor tissue. Image processing and volumetric techniques are performed on these THz scans to analyze and enhance the tumor image and assess its boundaries.
{"title":"Time of flight THz imaging of 3D ex-vivo breast cancer tumor tissues","authors":"T. Bowman, Yuhao Wu, A. Walter, J. Gauch, M. El-Shenawee, Lucas K. Campbell","doi":"10.1109/IRMMW-THZ.2015.7327416","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327416","url":null,"abstract":"This research represents experimental use of a pulsed terahertz time-domain imaging system to obtain time of flight (in-depth) reflection scans from three-dimensional ex-vivo breast cancer tumor tissue. Image processing and volumetric techniques are performed on these THz scans to analyze and enhance the tumor image and assess its boundaries.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"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":"81319451","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.2015.7327548
E. Schlecht, J. Siles, J. Treuttel, R. Lin, J. Yee, Dong Wu, B. Thomas, I. Mehdi
We describe a new instrument, the Terahertz Limb Sounder (TLS) designed to measure upper atmospheric winds and temperature in the altitude regime between 100 and 150 km. It is based on Doppler measurements of the line of neutral atomic oxygen, OI, at 2.06 THz. This measurement takes advantage of a Schottky diode based all solid state receiver.
{"title":"Terahertz Limb Sounder to measure winds and temperature above 100 km","authors":"E. Schlecht, J. Siles, J. Treuttel, R. Lin, J. Yee, Dong Wu, B. Thomas, I. Mehdi","doi":"10.1109/IRMMW-THZ.2015.7327548","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327548","url":null,"abstract":"We describe a new instrument, the Terahertz Limb Sounder (TLS) designed to measure upper atmospheric winds and temperature in the altitude regime between 100 and 150 km. It is based on Doppler measurements of the line of neutral atomic oxygen, OI, at 2.06 THz. This measurement takes advantage of a Schottky diode based all solid state receiver.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"38 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":"81440119","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.2015.7327653
D. Bisharat, S. Liao, Q. Xue
This paper presents a novel differentially-driven planar aperture antenna for circularly-polarized (CP) radiation. The proposed antenna is simple in structure and is constructed on only a single layer laminate using standard printed-circuit-board (PCB) technology. Circular polarization is realized by rotationally-symmetric windmill-shaped aperture-strip formation with travelling wave distribution. An opening-cavity that is formed by metalized vias is adopted to offer favorable unidirectional radiation and higher gain. Simulation results of a prototype working at V-band show a 3-dB axial ratio (AR) bandwidth of 17.4% (56.8-67.5 GHz), which is within its -10-dB impedance bandwidth. Meanwhile, the left-handed CP (LHCP) gain is stable throughout the operating bandwidth with a peak gain of 14.2 dBi. The proposed antenna is a promising candidate for millimeter-wave (mmWave) bands due to its merits of wideband, high gain, simple structure, low cost, and easy integration with differential circuits.
{"title":"Differentially-driven circularly-polarized planar aperture antenna for millimeter-wave application","authors":"D. Bisharat, S. Liao, Q. Xue","doi":"10.1109/IRMMW-THZ.2015.7327653","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327653","url":null,"abstract":"This paper presents a novel differentially-driven planar aperture antenna for circularly-polarized (CP) radiation. The proposed antenna is simple in structure and is constructed on only a single layer laminate using standard printed-circuit-board (PCB) technology. Circular polarization is realized by rotationally-symmetric windmill-shaped aperture-strip formation with travelling wave distribution. An opening-cavity that is formed by metalized vias is adopted to offer favorable unidirectional radiation and higher gain. Simulation results of a prototype working at V-band show a 3-dB axial ratio (AR) bandwidth of 17.4% (56.8-67.5 GHz), which is within its -10-dB impedance bandwidth. Meanwhile, the left-handed CP (LHCP) gain is stable throughout the operating bandwidth with a peak gain of 14.2 dBi. The proposed antenna is a promising candidate for millimeter-wave (mmWave) bands due to its merits of wideband, high gain, simple structure, low cost, and easy integration with differential circuits.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"75 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":"90053608","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.2015.7327496
Pu‐Kun Liu, Li Luo, C. Du
This paper presents the recent development of a 0.33 THz pulse gyrotron, operating on the fundamental harmonic co-rotating TE62+(1) mode. It employs a novel pre-bunched interaction circuit. The pulse magnet generates a time varying magnetic field to tune the radiation frequency via backward wave interaction. The optimized system is capable of generating radiation power about 1 kW ~ 2 kW during 330 GHz ~ 340 GHz. The compact pulse gyrotron is promising in scientific research and industrial applications.
{"title":"Broadband THz gyrotron based on a pulse magnet","authors":"Pu‐Kun Liu, Li Luo, C. Du","doi":"10.1109/IRMMW-THZ.2015.7327496","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327496","url":null,"abstract":"This paper presents the recent development of a 0.33 THz pulse gyrotron, operating on the fundamental harmonic co-rotating TE62+(1) mode. It employs a novel pre-bunched interaction circuit. The pulse magnet generates a time varying magnetic field to tune the radiation frequency via backward wave interaction. The optimized system is capable of generating radiation power about 1 kW ~ 2 kW during 330 GHz ~ 340 GHz. The compact pulse gyrotron is promising in scientific research and industrial applications.","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":"89761770","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.2015.7327722
E. Bryerton, J. Hesler, S. Retzloff
Two broadband tunable sources are presented covering 1100-1500 GHz and 1750-2200 GHz. Both sources utilize a common driver chain covering the full WR-4.3 (170-260 GHz) band with >10mW output power. The WM-164 source provides greater than 1uW average power from 1100-1500 GHz. The WM-130 source provides greater than 0.5uW output power from 1750-2200 GHz.
{"title":"Broadband tunable supra-THz test sources","authors":"E. Bryerton, J. Hesler, S. Retzloff","doi":"10.1109/IRMMW-THZ.2015.7327722","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327722","url":null,"abstract":"Two broadband tunable sources are presented covering 1100-1500 GHz and 1750-2200 GHz. Both sources utilize a common driver chain covering the full WR-4.3 (170-260 GHz) band with >10mW output power. The WM-164 source provides greater than 1uW average power from 1100-1500 GHz. The WM-130 source provides greater than 0.5uW output power from 1750-2200 GHz.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"29 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":"89400709","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.2015.7327394
A. Soltani, T. Probst, S. Sommer, M. Koch
We demonstrate real time monitoring of the curing of two-component epoxy adhesives at THz frequencies. Our method is based on THz time domain spectroscopy (TDS) in reflection geometry. We monitor the curing of two-component adhesive over ten hours and extract refractive index, absorption and thickness.
{"title":"Curing monitoring of two-component epoxy adhesives at THz frequencies","authors":"A. Soltani, T. Probst, S. Sommer, M. Koch","doi":"10.1109/IRMMW-THZ.2015.7327394","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327394","url":null,"abstract":"We demonstrate real time monitoring of the curing of two-component epoxy adhesives at THz frequencies. Our method is based on THz time domain spectroscopy (TDS) in reflection geometry. We monitor the curing of two-component adhesive over ten hours and extract refractive index, absorption and thickness.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"24 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":"86561990","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.2015.7327463
A. Snezhko, O. Volkov, V. Gubankov, I. Gundareva, Y. Divin, V. Pavlovskiy, V. Pokalyakin
Here, we report the results of spectral analysis of planar open ring resonators by Josephson spectroscopy. Square shape resonators on separate wafers were positioned in the vicinity of YBa2Cu3O7-x bicrystal Josephson junction (JJ). The DC characteristics of JJ demonstrated specific features related to resonant modes excitation. Resonators of various sizes were analyzed, and excitation of LC-modes at frequencies from 50 GHz to 700 GHz were observed. Resonator quality factors were estimated using resistively shunted model of JJ and resonator equivalent circuit.
{"title":"Spectral characterization of planar resonators by terahertz josephson spectroscopy","authors":"A. Snezhko, O. Volkov, V. Gubankov, I. Gundareva, Y. Divin, V. Pavlovskiy, V. Pokalyakin","doi":"10.1109/IRMMW-THZ.2015.7327463","DOIUrl":"https://doi.org/10.1109/IRMMW-THZ.2015.7327463","url":null,"abstract":"Here, we report the results of spectral analysis of planar open ring resonators by Josephson spectroscopy. Square shape resonators on separate wafers were positioned in the vicinity of YBa2Cu3O7-x bicrystal Josephson junction (JJ). The DC characteristics of JJ demonstrated specific features related to resonant modes excitation. Resonators of various sizes were analyzed, and excitation of LC-modes at frequencies from 50 GHz to 700 GHz were observed. Resonator quality factors were estimated using resistively shunted model of JJ and resonator equivalent circuit.","PeriodicalId":6577,"journal":{"name":"2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz)","volume":"31 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":"86770316","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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