Development of 1.5 THz Photon Detectors for Terahertz Intensity Interferometry

IF 1.1 3区 物理与天体物理 Q4 PHYSICS, APPLIED Journal of Low Temperature Physics Pub Date : 2024-09-12 DOI:10.1007/s10909-024-03212-z
Ayako Niwa, Hiroshi Matsuo, Hajime Ezawa, Tomohiro Koseki, Tomonori Tamura
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Abstract

We propose Terahertz Intensity Interferometry (TII) to realize high angular resolution observations above 1 THz. TII uses fast detectors and readout circuits to measure intensity correlation and determine the delay time for synthesis imaging. The development of a fast photon detector at 1.5 THz is discussed for Antarctic TII experiments. The 1.5 THz photon detector is designed to detect terahertz photons with antenna-coupled SIS junctions by pair-breaking process. The detector uses small size and low leakage Nb/Al-AlOx/Al/Nb junctions for high sensitivity at high frequency. The first fabricated detectors show reasonable I-V characteristics at 4 K, and further tuning of fabrication parameters is ongoing. For evaluation of the detectors at 0.8 K using fast cryogenic readout electronics, a new cryostat for the TII experiment will be used. As an initial step, a GaAs-JFET first-stage source-follower is installed at 0.8 K to measure the I-V characteristics of a submillimeter-wave SIS photon detector. The performance shows the new cryostat and the first-stage source-follower at 0.8 K can be used to evaluate 1.5 THz photon detectors, which will be combined with fast readout electronics for TII experiments.

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开发用于太赫兹强度干涉测量的 1.5 太赫兹光子探测器
我们提出太赫兹强度干涉测量法(TII),以实现 1 太赫兹以上的高角度分辨率观测。TII 使用快速探测器和读出电路来测量强度相关性,并确定合成成像的延迟时间。本文讨论了为南极 TII 实验开发 1.5 THz 快速光子探测器的问题。1.5 太赫兹光子探测器的设计目的是利用天线耦合 SIS 结,通过断对过程探测太赫兹光子。该探测器采用小尺寸、低泄漏的 Nb/Al-AlOx/Al/Nb 结,在高频率下具有高灵敏度。首批制造的探测器在 4 K 时显示出合理的 I-V 特性,目前正在进一步调整制造参数。为了在 0.8 K 温度下使用快速低温读出电子设备对探测器进行评估,将使用用于 TII 实验的新型低温恒温器。第一步是在 0.8 K 下安装 GaAs-JFET 第一级源随器,测量亚毫米波 SIS 光子探测器的 I-V 特性。其性能表明,新型低温恒温器和 0.8 K 下的第一级源随器可用于评估 1.5 THz 光子探测器,这些探测器将与 TII 实验的快速读出电子装置相结合。
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来源期刊
Journal of Low Temperature Physics
Journal of Low Temperature Physics 物理-物理:凝聚态物理
CiteScore
3.30
自引率
25.00%
发文量
245
审稿时长
1 months
期刊介绍: The Journal of Low Temperature Physics publishes original papers and review articles on all areas of low temperature physics and cryogenics, including theoretical and experimental contributions. Subject areas include: Quantum solids, liquids and gases; Superfluidity; Superconductivity; Condensed matter physics; Experimental techniques; The Journal encourages the submission of Rapid Communications and Special Issues.
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