Loss compensated and enhanced mid-infrared interaction-free sensing with undetected photons

Sensing with undetected photons enables the measurement of absorption and phase shifts at wavelengths different from those detected. Here, we experimentally map the balance and loss parameter space in a non-degenerate nonlinear interferometer, showing the recovery of sensitivity despite internal los...

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Bibliographic Details
Published in:arXiv.org 2022-05
Main Authors: Gemmell, Nathan R, Florez, Jefferson, Pearce, Emma, Czerwinski, Olaf, Phillips, Chris C, Oulton, Rupert F, Clark, Alex S
Format: Article
Language:English
Subjects:
Blackbody
Infrared imaging
Parameter sensitivity
Photons
Online Access:Get full text
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Summary:Sensing with undetected photons enables the measurement of absorption and phase shifts at wavelengths different from those detected. Here, we experimentally map the balance and loss parameter space in a non-degenerate nonlinear interferometer, showing the recovery of sensitivity despite internal losses at the detection wavelength. We further explore an interaction-free operation mode with a detector-to-sample incident optical power ratio of >200. This allows changes in attowatt levels of power at 3.4 \(\mu\)m wavelength to be detected at 1550 nm, immune to the level of thermal black-body background. This reveals an ultra-sensitive infrared imaging methodology capable of probing samples effectively `in the dark'.
ISSN:2331-8422