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Extraction of material parameters of a bi-layer structure using Terahertz time-domain spectroscopy

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Science China(Information Sciences) 2014年第8期57卷 238-247页

作者： JIN BiaoBing ZHANG CaiHong SHEN XiaoFang MA JinLong CHEN Jian shi shengcai WU PeiHeng Research Institute of Superconductor Electronics (RISE) School of Electronic Science and EngineeringNanjing University Purple Mountain Observatory Chinese Academy of Sciences Graduate School of Chinese Academy of Sciences Chinese Academy of Sciences

For a bi-layer structure consisting of a film deposited on a substrate,a new extraction method is proposed using which we can extract both the material parameters of the film and the thickness of the substrate from the measured Terahertz transmission through it,so long as the complex refractive index of the substrate is known *** method is applicable to a range of refractive indices of the film less than the refractive index of the substrate and a very wide range of layer thicknesses from 20μm to at least 200μ*** is very useful in some cases where the thickness of the substrate cannot be determined using conventional methods such as a Vernier caliper or micrometer screw.

关键词： material parameter Terahertz spectrum extraction method anti-reflection coating layer THztime-domain spectroscopy

4 K high frequency pulse tube cryocooler used for terahertz space application

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Chinese Science Bulletin 2014年第27期59卷 3490-3494页

作者： Jia Quan Yanjie Liu Dong Liu Kun Zhang Jingtao Liang Jing Li Qijun Yao shengcai shi Key Laboratory of Space Energy Conversion Technologies Technical Institute of Physics and Chemistry Chinese Academy of Sciences University of Chinese Academy of Sciences Key laboratory of Radio Astronomy Purple Mountain Observatory Chinese Academy of Sciences

Terahertz(THz) frequency region, defined from0.1 to 10 THz, is an important frequency band for radio astronomy and atmospheric science. As NbN Superconductor-Insulator-Superconductor(SIS) mixers used for terahertz detection, which are studied by the Purple Mountain Observatory(PMO), Chinese Academy of Sciences(CAS), work at 8–10 K, and require condition of micro vibrations, its astronomical observation in aerospace is limited by suitable refrigeration method. 4 K high frequency pulse tube cryocooler developed by Key Laboratory of Space Energy Conversion Technologies(SECT), Technical Institute of Physics and Chemistry(TIPC), CAS, offers an opportunity for the application of SIS mixers. This article introduces the progress of the two-stage high frequency pulse tube cryocooler researched by TIPC. The cryocooler has reached a no load temperature of 4.5 K which is the lowest temperature for this kind of cryocooler reported so far. The successful coupling between the THz component and the high frequency pulse tube cryocooler lays a solid foundation for space detection in the terahertz band.

关键词：脉冲管制冷机太赫兹高频空间应用紫金山天文台能源转换技术重点实验室大气科学

Terahertz atmospheric windows for high angular resolution terahertz astronomy from Dome A

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Advances in Polar Science 2019年第1期30卷 76-80页

作者： Hiroshi MATSUO shengcai shi Scott PAINE Qijun YAO Zhenhui LIN National Astronomical Observatory of Japan Purple Mountain Observatory Key Laboratory of Radio Astronomy Chinese Academy of Sciences Smithsonian Astrophysical Observatory

Atmospheric transmission from Dome A, Antarctica, presents new possibilities in the field of terahertz astronomy, where space telescopes have been the only observational tools until now. Using atmospheric transmission measurements from Dome A with a Fourier transform spectrometer, transmission spectra and long-term stabilities have been analyzed at 1.461 THz, 3.393 THz, 5.786 THz and 7.1 THz, which show that important atmospheric windows for terahertz astronomy open for a reasonable length of time in the winter season. With large aperture terahertz telescopes and interferometers at Dome A, high angular resolution terahertz observations are foreseen of atomic fine-structure lines from ionized gas and a water ice feature from protoplanetary disks.

关键词： terahertz astronomy atmospheric window Fourier transform spectroscopy terahertz telescope terahertz interferometry

超导隧道结在事件视界望远镜黑洞成像及射电天文中的应用

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科学通报 2019年第20期64卷 2067-2069页

作者：史生才李婧中国科学院紫金山天文台南京210034 中国科学院射电天文重点实验室南京210034

2019年4月10日,事件视界望远镜(Event Horizon Telescope,EHT)[1]发布了人类历史上第一张真实的黑洞照片.此次EHT观测集合了横跨四大洲的8台射电天文望远镜(包括JCMT(James Clerk Maxwell Telescope)等6台单天线望远镜和SMA(Submillimeter Array)与ALMA(Atacama Large Millimeter/submillimeter Array)两台干涉阵),观测波段在1.3 mm(即230 GHz频率).基于甚长基线干涉阵(very long baseline interferometer,VLBI)技术形成了一个口径相当于地球直径的单天线望远镜,使其空间分辨率达到天文观测前所未有的20微角秒.需要指出的是,具有最大口径和最高灵敏度的ALMA干涉阵在此次射电星系M87中心黑洞观测中发挥了决定性作用.

关键词：射电天文望远镜中心黑洞事件视界超导隧道结 Maxwell 天文观测应用成像

Development of series SQUID array with on-chip filter for TES detector

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Chinese Physics B 2022年第2期31卷 665-670页

作者： Wentao Wu Zhirong Lin Zhi Ni Peizhan Li Tiantian Liang Guofeng Zhang Yongliang Wang Liliang Ying Wei Peng Wen Zhang shengcai shi Lixing You Zhen Wang State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology(SIMIT)Chinese Academy of Sciences(CAS)Shanghai 200050China CAS Center for Excellence in Superconducting Electronics(CENSE) Shanghai 200050China University of Chinese Academy of Sciences Beijing 100049China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China University of Science and Technology of China Hefei 230026China

A cold preamplifier based on superconducting quantum interference devices(SQUIDs)is currently the preferred readout technology for the low-noise transition edge sensor(TES).In this work,we have designed and fabricated a series SQUID array(SSA)amplifier for the TES detector readout *** this SSA amplifier,each SQUID cell is composed of a first-order gradiometer formed using two equally large square washers,and an on-chip low pass filter(LPF)as a radiofrequency(RF)choke has been developed to reduce the Josephson oscillation interference between individual SQUID *** addition,a highly symmetric layout has been designed carefully to provide a fully consistent embedded electromagnetic environment and achieve coherent flux *** measured results show smooth V-Φcharacteristics and a swing voltage that increases linearly with increasing SQUID cell number N.A white flux noise level as low as 0.28μφ;/Hz;is achieved at 0.1 K,corresponding to a low current noise level of 7 pA/Hz;.We analyze the measured noise contribution at mK-scale temperatures and find that the dominant noise derives from a combination of the SSA intrinsic noise and the equivalent current noise of the room temperature electronics.

关键词： SSA amplifier TES detectors on-chip low pass filter(LPF) noise contribution

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小华煤矿主排水控制系统改造设计

煤矿机电 2017年第4期38卷 104-106页

作者：施生才福建省永安煤业有限责任公司小华煤矿福建三明366103

针对小华煤矿+580 m主排水系统采用人工手动控制方式存在技术落后、可靠性差及效率低等问题,提出了主排水采用S7-300 PLC自动控制系统的改造方案。重点介绍了该系统的总体方案、工作原理和控制流程。实际应用表明,该改造方案取得了较好... 详细信息

针对小华煤矿+580 m主排水系统采用人工手动控制方式存在技术落后、可靠性差及效率低等问题,提出了主排水采用S7-300 PLC自动控制系统的改造方案。重点介绍了该系统的总体方案、工作原理和控制流程。实际应用表明,该改造方案取得了较好的经济效益。

关键词：主排水泵自动化改造可编程控制系统(PLC) 通信系统

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高性能超导相变边缘单光子探测器(特邀)

光子学报 2023年第5期52卷 1-9页

作者：李佩展钟家强张文王争耿悦姚骑均缪巍任远李婧史生才中国科学院紫金山天文台南京210023 中国科学技术大学天文与空间科学学院合肥230026

研究了钛膜的特性及调控机制,通过烘烤后处理工艺分析了临界温度随烘烤时间和烘烤温度的变化关系,发现临界温度随烘烤时间对数降低,但是随烘烤温度指数降低。拓展了二流体模型提取了超导相变边缘单光子探测器的温度灵敏度系数和电流灵... 详细信息

研究了钛膜的特性及调控机制,通过烘烤后处理工艺分析了临界温度随烘烤时间和烘烤温度的变化关系,发现临界温度随烘烤时间对数降低,但是随烘烤温度指数降低。拓展了二流体模型提取了超导相变边缘单光子探测器的温度灵敏度系数和电流灵敏度系数,并结合脉冲响应得到了器件的热容,进一步理论计算了能量分辨率对器件临界温度的依存性。最终,在器件制备过程中集成光学腔体,在1550 nm波长的光子吸收效率接近100%。研制的超导相变边缘单光子探测器系统探测效率超过90%,能量分辨率约为0.5 eV,可分辨至少10个1550 nm光子,满足快速时变天体的观测需求。

关键词：相变边缘探测器单光子探测能量分辨率量子效率

面向CMB偏振实验的220 GHz钛超导TES探测器技术研究

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光学精密工程 2023年第4期31卷 442-449页

作者：罗强辉缪巍李费明钟家强王争丁江乔周康敏张文任远史生才中国科学院紫金山天文台江苏南京210023 中国科学技术大学安徽合肥230026 南京信息工程大学江苏南京210044

高灵敏度超导相变边缘探测器(Transition Edge Sensor,TES)在宇宙微波背景(Cosmic Microwave Background,CMB)辐射B模偏振探测方面具有重要的应用前景。本文设计并制备了220 GHz频段8×8像元的天线耦合钛超导TES探测器,实验表征了刻蚀... 详细信息

高灵敏度超导相变边缘探测器(Transition Edge Sensor,TES)在宇宙微波背景(Cosmic Microwave Background,CMB)辐射B模偏振探测方面具有重要的应用前景。本文设计并制备了220 GHz频段8×8像元的天线耦合钛超导TES探测器,实验表征了刻蚀前钛超导TES探测器的低温热导和噪声特性。实验结果显示,钛超导TES探测器低温电声相互作用主导热导约为485.4 pW/K,同时钛超导TES探测器噪声等效功率优于5×10^(-17)W/Hz^(0.5)。原理上,钛超导TES探测器热导在刻蚀后会进一步减小,理论计算出刻蚀后钛超导TES探测器的热导约为38 pW/K,同时,其热起伏等效噪声功率理论值约为9.2×10^(-18)W/Hz^(0.5),因此,钛超导TES探测器在刻蚀后的噪声等效功率性能会进一步提升。

关键词：高灵敏度超导相变边缘探测器热导噪声等效功率

Improvement of energy resolution of x-ray transition-edge sensor using K-means algorithm and Wiener filter

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Chinese Physics B 2023年第10期32卷 695-699页

作者：马卿效张文李佩展王争冯志发杨心开钟家强缪巍任远李婧史生才 Purple Mountain Observatory Chinese Academic of SciencesNanjing 210023China College of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026ChinaXinkai

We develop an x-ray Ti/Au transition-edge sensor(TES)with an Au absorber deposited on the center of TES and improved its energy resolution using the K-means clustering algorithm in combination with Wiener *** firstly extract the main parameters of each recorded pulse trace,which are adopted to classify these traces into several clusters in the K-means clustering *** real traces are selected for energy resolution *** the baseline correction,the Wiener filter is used to improve the signal-to-noise *** the silicon underneath the TES has not been etched to reduce the thermal conductance,the energy resolution of the developed x-ray TES is improved from 94 eV to 44 eV at 5.9 keV.

关键词： transition-edge sensors energy resolution K-means clustering Wiener filter