2026-10-14T04:26:16Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34046841 2026-10-01T16:01:00Z category_37476 portal_1023 item_type_12 month_year_10_2026

Scanless quantum Fourier-transform mid-infrared spectroscopy for solids and surface analysis Paul Gattinger (14388030) Michela Conti (25157331) Franziska Dietz (25157334) Andrei N. Halangescu Moldovan (25157337) Andreas W. Schell (1318830) Markus Brandstetter (1352436) Ivan Zorin (5152073) Physics (arXiv) physics.optics (arXiv) physics.ins-det (arXiv) quant-ph (arXiv) Quantum infrared (IR) spectroscopy is a novel technique based on nonlinear interferometry and quantum sensing with undetected photons. In this approach, spectrally far-separated correlated photon pairs are used for detection and probing, respectively. Hence, the probing wavelength domain (mid-IR) is substantially different from the detection spectral range (near-IR), which enables shot-noise-limited and cost-effective sensing schemes attractive for applied metrology. In this paper, we implement and employ a custom-built scanless quantum Fourier-transform mid-IR (sQFTIR) microspectrometer for chemical characterization and analysis of solids and interfaces. The sQFTIR system employs spectral-domain acquisition, without the need to scan the optical delay. This results in enhanced sensitivity and short measurement times and therefore enables rapid spectral acquisitions in 100~ms spanning a spectral band from 3000 cm$^{-1}$ - 2400 cm$^{-1}$. The capabilities of our approach are demonstrated for hyperspectral mid-IR imaging of dried pharmaceuticals (insulin on a gold surface) and investigation of a security feature on a banknote. Furthermore, we demonstrate hyperspectral imaging and spectroscopy through a turbid ceramic medium. 2026-09-29T00:00:00Z Text Preprint 10.48550/arXiv.2609.37281 https://figshare.com/articles/preprint/Scanless_quantum_Fourier-transform_mid-infrared_spectroscopy_for_solids_and_surface_analysis/34046841 CC0