A terahertz detector based on superconductor-graphene-superconductor Josephson junction. (15th January 2023)

• Record Type: Journal Article
• Authors: Miao, Wei; Li, Feiming; Luo, Qianghui; Wang, Qingcheng; Zhong, Jiaqiang; Wang, Zheng; Zhou, Kangmin; Ren, Yuan; Zhang, Wen; Li, Jing; Shi, Shengcai; Yu, Cui; He, Zezhao; Liu, Qingbin; Feng, Zhihong
• Is Part Of: Carbon. Volume 202(2023)Part 2
• Page Start: 112
• Page End: 117
• Publication Date: 2023-01-15
• Subjects: Terahertz detector -- SGS junction -- Proximity Josephson coupling -- NEP; Carbon -- Periodicals; Carbone -- Périodiques; Koolstof; Toepassingen; Electronic journals; 546.681
• DOI: 10.1016/j.carbon.2022.11.040
• Languages: English
• ISSNs: 0008-6223

Abstract

Abstract: Graphene is an attractive material for terahertz (THz) detectors due to its unique properties of extremely weak electron-phonon interaction and small electronic heat capacity. In this paper, we demonstrate a lens-antenna-coupled THz detector based on a diffusive superconductor-graphene-superconductor (SGS) junction, which has a sharp resistive transition at 1.4 K due to the proximity Josephson coupling. The SGS Josephson detector, measured with a dc superconducting quantum interference device (SQUID) readout, exhibits an electrical noise equivalent power (NEP) as low as 5 × 10 −17 W/Hz 0.5 at 0.1 K, which is still limited by the readout noise. Furthermore, the optical performance of the SGS Josephson detector is measured with a cryogenic blackbody radiation source, giving an optical NEP of 2.5–5 × 10 −16 W/Hz 0.5 at 1.4 THz in the temperature range from 0.1 K to 0.6 K. Graphical abstract: Image 1