We give a brief review of the developments in terahertz time-domain spectroscopy(THz-TDS) systems and microcavity components for probing samples in the University of Shanghai for Science and Technology. The broadband ...We give a brief review of the developments in terahertz time-domain spectroscopy(THz-TDS) systems and microcavity components for probing samples in the University of Shanghai for Science and Technology. The broadband terahertz(THz) radiation sources based on GaAs m-i-n diodes have been investigated by applying high electric fields. Then, the free space THz-TDS and fiber-coupled THz-TDS systems produced in our lab and their applications in drug/cancer detection are introduced in detail. To further improve the signal-to-noise ratio(SNR) and enhance sensitivity, we introduce three general micro-cavity approaches to achieve tiny-volume sample detection, summarizing our previous results about their characteristics, performance, and potential applications.展开更多
The advancement of 6G technology relies on the development of high-performance terahertz detectors that can operate at room temperature.These detectors are crucial for Internet of Things(Io T)applications,which requir...The advancement of 6G technology relies on the development of high-performance terahertz detectors that can operate at room temperature.These detectors are crucial for Internet of Things(Io T)applications,which require sensitive environmental sensing and efficient reception of 6G signals.One significant research focus is on detection technology with high responsiveness and low equivalent noise power for 6G signals,which experience high losses in the air.To meet the demand for ultra-sensitive detectors in 6G technology,we have employed several techniques.Firstly,we prepared a large area of Weyl-semimetal layer through magnetron sputtering.Secondly,we obtained a high-quality Weyl-semimetal active layer by carefully controlling the annealing conditions.Next,a thin nano-Au layer was introduced as a micro-cavity reflection layer to enhance the device's detection rate.Additionally,we incorporated an electromagnetic induction well to improve carrier confinement and enhance the detection sensitivity.This proposed high-performance terahertz detector,with its potential for industrial production,offers a valuable technical solution for the advancement of 6G technology.展开更多
The micro-combustion chamber is the key component for micro-TPV systems. To improve the combustor wall temperature level and its uniformity and efficiency, an improved flat micro-combustor with a front cavity is built...The micro-combustion chamber is the key component for micro-TPV systems. To improve the combustor wall temperature level and its uniformity and efficiency, an improved flat micro-combustor with a front cavity is built, and the combustion performance of the original and improved combustors of premixed H2/air flames under various inlet velocities and equivalence ratios is numerically investigated. The effects of the front cavity height and length on the outer wall temperature and efficiency are also discussed. The front cavity significantly improves the average outer wall temperature, outer wall temperature uniformity, and combustion efficiency of the micro-combustor, increases the area of the high temperature zone, and enhances the heat transfer between the burned blends and inner walls. The micro-combustor with the front cavity length of 2.0 mm and height of 0.5 mm is suitable for micro-TPV system application due to the relatively high outer wall temperature, combustion efficiency, and the most uniform outer wall temperature.展开更多
基金the National Key R&D Program of China (No. 2018YFF01013003)the Program of Shanghai Pujiang Program, China (No. 17PJD028)+4 种基金the National Natural Science Foundation of China (Nos. 61671302, 61601291, and 61722111)the Shuguang Program supported by the Shanghai Education Development Foundation and Shanghai Municipal Education Commission, China (No. 18SG44)the Key Scientific and Technological Project of Science and Technology Commission of Shanghai Municipality, China (No. 15DZ0500102)the Shanghai Leading Talent, China (No. 2016-019)the Young Yangtse Rive Scholar, China (No. Q2016212).
文摘We give a brief review of the developments in terahertz time-domain spectroscopy(THz-TDS) systems and microcavity components for probing samples in the University of Shanghai for Science and Technology. The broadband terahertz(THz) radiation sources based on GaAs m-i-n diodes have been investigated by applying high electric fields. Then, the free space THz-TDS and fiber-coupled THz-TDS systems produced in our lab and their applications in drug/cancer detection are introduced in detail. To further improve the signal-to-noise ratio(SNR) and enhance sensitivity, we introduce three general micro-cavity approaches to achieve tiny-volume sample detection, summarizing our previous results about their characteristics, performance, and potential applications.
基金supported by the National Natural Science Foundation of China(Grant No.12104314)the Key Laboratory of Optoelectronic Devices Systems of Ministry of Education and Guangdong Province and Research Foundation of Liaocheng University(Grant No.318052316)。
文摘The advancement of 6G technology relies on the development of high-performance terahertz detectors that can operate at room temperature.These detectors are crucial for Internet of Things(Io T)applications,which require sensitive environmental sensing and efficient reception of 6G signals.One significant research focus is on detection technology with high responsiveness and low equivalent noise power for 6G signals,which experience high losses in the air.To meet the demand for ultra-sensitive detectors in 6G technology,we have employed several techniques.Firstly,we prepared a large area of Weyl-semimetal layer through magnetron sputtering.Secondly,we obtained a high-quality Weyl-semimetal active layer by carefully controlling the annealing conditions.Next,a thin nano-Au layer was introduced as a micro-cavity reflection layer to enhance the device's detection rate.Additionally,we incorporated an electromagnetic induction well to improve carrier confinement and enhance the detection sensitivity.This proposed high-performance terahertz detector,with its potential for industrial production,offers a valuable technical solution for the advancement of 6G technology.
基金Project(11802336) supported by the National Natural Science Foundation of China
文摘The micro-combustion chamber is the key component for micro-TPV systems. To improve the combustor wall temperature level and its uniformity and efficiency, an improved flat micro-combustor with a front cavity is built, and the combustion performance of the original and improved combustors of premixed H2/air flames under various inlet velocities and equivalence ratios is numerically investigated. The effects of the front cavity height and length on the outer wall temperature and efficiency are also discussed. The front cavity significantly improves the average outer wall temperature, outer wall temperature uniformity, and combustion efficiency of the micro-combustor, increases the area of the high temperature zone, and enhances the heat transfer between the burned blends and inner walls. The micro-combustor with the front cavity length of 2.0 mm and height of 0.5 mm is suitable for micro-TPV system application due to the relatively high outer wall temperature, combustion efficiency, and the most uniform outer wall temperature.
