Optical response of Al/Ti bilayer transition edge sensors

Abstract

Optical response of Al/Ti bilayer transition edge sensors * Zhang Qing-Ya(张青雅) a)b) , Wang Tian-Shun(王天顺) c)d) , Liu Jian-She(刘建设) a)b) , Dong Wen-Hui(董文慧) a)b) , He Gen-Fang(何根芳) a)b) , Li Tie-Fu(李铁夫) a)b) , Zhou Xing-Xiang(周幸祥) c)d) † , and Chen Wei(陈 炜) a)b) ‡

Superconductivity of bilayer titanium/indium thin film grown on SiO 2 /Si (001)

“…The lowest T c (645 mK) in our work is a little higher but also comparable to the results of the Al/Ti bilayer in Refs. [1] and [11] whose lowest T c is around 540 mK. This implies that it is possible for our sample to be used as TES bolometers for millimeter wave and submillimeter wave astrophysics.…”

“…Because of its high thermal sensitivity, it has wide applications in many areas, including single photon detectors from near-infrared to γ-ray, cosmic microwave background bolometers, and dark matter detectors. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The T c of a bilayer superconducting thin film system could be tuned in a well controlled way by just tuning the thickness ratio of the two elements. Many bilayer systems, such as Mo/Au, Mo/Cu, Ti/Au, and Ti/Al systems, [1,11,[16][17][18][19][20][21] have been chosen for fabricating the TESs.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] The T c of a bilayer superconducting thin film system could be tuned in a well controlled way by just tuning the thickness ratio of the two elements. Many bilayer systems, such as Mo/Au, Mo/Cu, Ti/Au, and Ti/Al systems, [1,11,[16][17][18][19][20][21] have been chosen for fabricating the TESs.…”

Recent progress of superconducting electronics in China

“…为了提高探测 器的灵敏度, TES通常选择超导转变温度在mK温 区的材料来制备探测器薄膜, 包括W [114] , Ti [115] 等 单质超导薄膜, 以Mo/Au [116] , Mo/Cu [117] , Ti/Au [118] 为代表的超导/金属(superconducting/normal, S/N) 双层薄膜, 以及以AlMn [119] I n P r e s s multiplexing, FDM) [122,123] 的研究人员使用高质量的Ti薄膜 [127] 制备了面 向太赫兹波段应用的双缝天线耦合的TES功率计 (阵 列 ) [128,129] , [130−132] 研制了16像素(4×4)的TES功率计, 噪声等效功 率约为5 × 10 -17 W/Hz 1/2 . 在应用方面, 高能所正 在联合国内外多个单位, 在西藏阿里5250 m的高 海拔地区建设原初引力波观测站 [133,134] . 该观测站 的核心观测装备是一个拥有约7000个TES探测 器像素, 探测波段为95 GHz与150 GHz的折射 天文台的研究人员分别采用Al/Ti [135] 与Ti [136] 薄 膜研制了上述波段的TES探测器.…”

Aluminum–Titanium Bilayer for Near-Infrared Transition Edge Sensors

“…TESs based on an Al/Ti bilayer have already been used as bolometers for astrophysical applications at far-infrared and millimeter wavelengths [ 9 , 10 ]. Recently, also in the optical range, a characterization of a suspended TES bolometer has been published [ 11 ]. However, in this case, the high level of noise did not allow for the discrimination of single photons at telecommunication wavelengths.…”