{"title":"Development of 1.5 THz Photon Detectors for Terahertz Intensity Interferometry","authors":"Ayako Niwa, Hiroshi Matsuo, Hajime Ezawa, Tomohiro Koseki, Tomonori Tamura","doi":"10.1007/s10909-024-03212-z","DOIUrl":null,"url":null,"abstract":"<div><p>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.</p></div>","PeriodicalId":641,"journal":{"name":"Journal of Low Temperature Physics","volume":null,"pages":null},"PeriodicalIF":1.1000,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Low Temperature Physics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s10909-024-03212-z","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"PHYSICS, APPLIED","Score":null,"Total":0}
引用次数: 0
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.
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.