TST, Vol. 11, No. 3, PP. 65-72
(Invited paper) Terahertz absorption spectroscopy of ammonia vapor detection based on Bi2Sr2CaCu2O8+δ intrinsic Josephson junction stacks
Hancong Sun 1*, Ya Huang 1, Xianjing Zhou 1, Xuecou Tu 1, Jun Li 1, Reinhold Kleiner 2, Valery P. Koshelets 3, Huabing Wang 1, and Peiheng Wu 1
1 Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210046, People’s Republic of China
2 Physikalisches Institut and Center for Collective Quantum Phenomena in LISA+, Universität Tübingen, D-72076 Tübingen, Germany
3 Kotel’nikov Institute of Radio Engineering and Electronics, Moscow 125009, Russia
* E-mail: hancong_sun@163.com
(Received December 23, 2017)
Abstract: We report on the application of terahertz (THz) waves radiated from Bi2Sr2CaCu2O8+δ (BSCCO) intrinsic Josephson junction (IJJ) stacks on the gas detection. The THz emission is provided by controlling the voltage across the stack, and the ammonia gas absorption peak at a frequency of about 0.572 THz was observed by adjusting the bias current for a direct and mixing detection technique. The minimum absorption linewidth turned out to be as narrow as about 5 MHz. The obtained ammonia-absorption spectra suggest that the BSCCO emitter can be an important terahertz source for potential THz applications in trace-gas detection.
Keywords: BSCCO, Terahertz emitter, Terahertz spectroscopy
doi: 10.11906/TST.065-072.2018.09.07
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TST, Vol. 11, No. 3, PP. 73-90
(Invited paper) Fano resonances in the corrugated disk resonator and their applications
Lin Chen 1, 2, Bo Liu 1, and Yiming Zhu 1*, 2
1 Shanghai Key Lab of Modern Optical System, University of shanghai for Science and Technology, Shanghai, China
2 Cooperative Innovation Centre of Terahertz Science, University ofElectronic Science Chengdu, China
* Email: ymzhu@usst.edu.cn
(Received December 26, 2017)
Abstract: Wehaveexperimentally excited terahertz multipolar Fano resonancesin two asymmetrical metal particles: a defective corrugated metallic disk(CMD) structure and a hybrid structure consisted of a C-shaped resonator and a CMD. Furthermore, the Fano resonance modes can also be excited by the interaction between plasmonic waveguide and CMD. Our findings haveshed light into the terahertz multipolar Fano resonances in asymmetrical CMD and opened the way to the design of terahertz plasmonic devices.
Keywords: Terahertz, Fano resonances, Corrugated metallic disk
doi: 10.11906/TST.073-090.2018.09.08
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TST, Vol. 11, No. 3, PP. 91-101
(Invited paper) Nondestructive evaluation of different material inclusions in glass fiber reinforced polymer composites by terahertz imaging
Jie Wang 1, Jin Zhang 1*, Tianying Chang 1, 2, and Hong-Liang Cui 1, 3
1 College of Instrumentation and Electrical Engineering, Jilin University, Changchun, Jilin, China 130061
2 Institute of Automation, Qilu University of Technology (Shandong Academy of Sciences), Jinan, Shandong, China 250014
3 Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing, China 400714
* Email: zhangjin0109@jlu.edu.cn
(Recived June 1, 2018)
Abstract: A glass fiber reinforced polymer (GFRP) solid panel hidden different material inclusions has been systematically detected via terahertz (THz) time domain spectroscopy (TDS) system. It is experimentally demonstrated that the defect detection effect of THz-TDS imaging technology is obviously different for several material inclusions. Under the transmission mode, the imaging effect of the inclusion is proportional to the attenuation degree difference of THz wave after penetrating the inclusion defect, whereas it depends on the refractive index difference between the inclusion and the epoxy GFRP solid panel under the reflection mode. Furthermore, X-ray computed tomography (CT) and ultrasonic imaging are also used to detect the GFRP solid panel. The detection results among THz-TDS, X-ray CT, and ultrasonic imaging with regard to fiber orientation, visualization of defect and inspection cost are comparatively analyzed to evaluate the correct location of THz-TDS technology in the traditional nondestructive evaluation (NDE) tools.
Keywords: Glass fiber reinforced polymer composites; Terahertz; X-ray; Ultrasound; Nondestructive evaluation.
doi: 10.11906/TST.091-101.2018.09.09
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