Toward laboratory demonstration of terahertz intensity interferometry

Hiroshi Matsuo; Hajime Ezawa; Ayako Niwa; Tomohiro Koseki; Norio Okada

doi:10.1117/12.3021092

28 August 2024 Toward laboratory demonstration of terahertz intensity interferometry

Hiroshi Matsuo, Hajime Ezawa, Ayako Niwa, Tomohiro Koseki, Norio Okada

Author Affiliations +

Proceedings Volume 13095, Optical and Infrared Interferometry and Imaging IX; 130951L (2024) https://doi.org/10.1117/12.3021092
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

Application of intensity interferometry in far-infrared and terahertz frequencies is discussed for high angular resolution observations. Interferometer technologies with heterodyne and double Fourier are compared to clarify the merit of intensity interferometry and challenges to aperture synthesis imaging. Photon bunching caused by thermal radiation can be used to determine the delay time in place of electromagnetic phase information, which may estimate the complex visibility for aperture synthesis imaging. For the fast measurement of photon bunching, superconducting tunnel junction detectors, such as SIS photon detectors, can be used. Laboratory demonstrator of intensity interferometry was developed using a 4-K pulse-tube cooler, ⁴He sorption fridges, and SIS photon detectors with fast readout electronics. Optical evaluation of the detector performance as well as developments of fast readout electronics are made toward intensity correlation and delay time measurements. Applications to long baseline terahertz interferometry in Antarctica and to space far-infrared interferometry are discussed.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Hiroshi Matsuo, Hajime Ezawa, Ayako Niwa, Tomohiro Koseki, and Norio Okada "Toward laboratory demonstration of terahertz intensity interferometry", Proc. SPIE 13095, Optical and Infrared Interferometry and Imaging IX, 130951L (28 August 2024); https://doi.org/10.1117/12.3021092

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