Wide-field mid- to long-wave infrared imaging with undetected photons

• URL: http://arxiv.org/abs/2608.20015v1
• Date: Thu, 20 Aug 2026 13:27:30 GMT
• Title: Wide-field mid- to long-wave infrared imaging with undetected photons
• Abstract summary: Quantum imaging with undetected photons (QIUP) allows an object to be probed at mid-infrared frequencies by only measuring interference in the visible range.<n>We show that non-collinear phase-matching in a silver thiogallate enables wide-field QIUP in the wavelength range of $$m.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Quantum imaging with undetected photons (QIUP) allows an object to be probed at mid-infrared frequencies by only measuring interference in the visible range, thus leveraging silicon camera technology. We show that non-collinear phase-matching in a silver thiogallate (AgGaS$_2$) crystal enables wide-field QIUP in the wavelength range of 6-10 $μ$m (1670-1000 cm$^{-1}$). A combination of coherent detection and infrared photons being ``undetected'' enables imaging at ${\sim}$100 times better than the background-limited infrared photodetection (BLIP) limit. At 8 $μ$m, our images have over 8000 $\pm$ 100 resolvable elements with a 297 $\pm$ 5 $μ$m resolution, and 10 s acquisition time. Our results pave the way to fast, background-noise-free, room-temperature, spectrally-selective mid-infrared imaging.

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