Year: 2026
Type: article
Abstract: In this paper, we present the development and experimental characterization of a cryogenic Fabry-Perot spectrometer, proposed for on-chip integration with submillimeter wave detectors. The Fabry-Perot interferometer design was chosen for its compactness, compatibility with polarimetric imaging, and versatile spectral resolution capabilities. By using dielectric Bragg mirrors, the presented Fabry-Perot mitigates the absorption losses typical of conventional metallic mesh mirrors, thereby enhancing transmission efficiency while keeping high finesse. We discuss the theoretical framework and performance considerations of a Fabry-Perot interferometer based on silicon Bragg reflectors and provide an analysis of spectral responses obtained from cryogenic optical measurements. These results demonstrate the potential of Bragg-mirror Fabry-Perot spectrometers as a viable approach for future medium and high-resolution, multi-functional submillimeter imaging detection systems for ground and space-based observatories.
Source: Applied Optics
DOI: 10.1364/ao.589684
Institutions: Université Paris-Saclay, Laboratoire atmosphères, milieux, observations spatiales, Université Paris Cité, Max Planck Institute for Extraterrestrial Physics, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Laboratoire d'Électronique des Technologies de l'Information, Université Grenoble Alpes
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Funder: Agence Nationale de la Recherche
OpenAlex ID: W7154202512