Oral Presentation

Twin-slot antenna coupled superconducting Ti transition edge sensor

Author(s): Wen Zhang, Wei Miao, Zheng Wang, Jia-Qiang Zhong, Dong Liu, Qi-Jun Yao, and Sheng-Cai Shi

Presenter: Wen Zhang (Purple Mountain Observatory)

We have developed four-leg supported superconducting Ti transition edge sensors (TES) with KOH wet etching. The current-voltage curves of the same TES device are measured before and after wet etching, its thermal conductance (G) is reduced to 500 pW/K from 8950 pW/K. The measured effective response time is 143 μs, about 30 times larger. In addition, we have studied the optical noise equivalent power (NEP) with a cryogenic blackbody in combination with metal-mesh filters to define the radiation bandwidth. The obtained optical NEP is 5×10^-16 W/√Hz, which is suitable for ground-based astronomical applications.