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arXiv · 2610.11582

Undetected Photon Spectroscopy in the Long-wave and Far Infrared

Jinghan Dong·Jingrui Zhang·Haichen Zhou·Weijie Nie·John G. Rarity·Alex S. Clark
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Abstract

Spectroscopy with undetected photons allows the spectral response of a sample at long wavelengths to be measured through interference of a shorter-wavelength signal field, without directly detecting the light that probes the sample. Previous demonstrations of undetected-photon spectroscopy in the molecular fingerprint region have reached approximately 10.5 microns, leaving longer wavelengths largely unexplored. Here, we extend this approach to 20 microns wavelength, demonstrating infrared undetected-photon spectroscopy using a BaGa2GeSe6 (BGGSe)-based nonlinear interferometer while only the near-infrared (NIR) signal is detected using a silicon detector. Rotation of the BGGSe crystal provides broad wavelength tuning, and Fourier-transform analysis of the signal interferograms yields the corresponding idler spectra and sample transmittance. Broadband absorption spectroscopy is demonstrated using Kapton across a 7.8-20 microns wavelength range, with the measured absorption agreeing with independent infrared measurements. The same system is further employed to detect sulfur hexafluoride (SF6) gas via spectroscopy near 10.55 microns. These results substantially extend the accessible spectral range of spectroscopy with undetected photons while retaining silicon-based NIR detection.

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Jinghan Dong, Jingrui Zhang, Haichen Zhou, Weijie Nie, John G. Rarity, Alex S. Clark. 2026-10-08. Undetected Photon Spectroscopy in the Long-wave and Far Infrared. https://arxiv.org/abs/2610.11582

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