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

• URL: http://arxiv.org/abs/2205.08832v1
• Date: Wed, 18 May 2022 10:03:49 GMT
• Title: Loss compensated and enhanced mid-infrared interaction-free sensing with undetected photons
• Authors: Nathan R. Gemmell, Jefferson Florez, Emma Pearce, Olaf Czerwinski, Chris C. Phillips, Rupert F. Oulton and Alex S. Clark
• Abstract summary: We experimentally map the balance and loss parameter space in a non-degenerate nonlinear interferometer. We explore an interaction-free operation mode with a detector-to-sample incident optical power ratio of >200. This reveals an ultra-sensitive infrared imaging methodology capable of probing samples effectively in the dark'
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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'.

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