Abstract
The spectral imaging and detection of mid-infrared wavelengths is emerging as an enabling technology of great technical and scientific interest, primarily because important chemical compounds display unique and strong mid-infrared spectral fingerprints that reveal valuable chemical information. Modern quantum cascade lasers have evolved as ideal coherent mid-infrared excitation sources, but simple, low-noise, room-temperature detectors and imaging systems lag behind. We address this need by presenting a novel, field-deployable, upconversion system for sensitive, two-dimensional, mid-infrared spectral imaging. A room-temperature dark noise of 0.2 photons/spatial element/second is measured, which is a billion times below the dark noise level of cryogenically cooled InSb cameras. Single-photon imaging and a resolution of up to 200 × 100 spatial elements are obtained with a record-high continuous-wave quantum efficiency of ∼20% for polarized incoherent light at 3 µm. The proposed method is relevant for existing and new mid-infrared applications such as gas analysis and medical diagnostics.
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Acknowledgements
The authors thank P.S. Ramanujam for helpful discussions regarding the layout of the manuscript. The authors also acknowledge financial support from the Copenhagen Cleantech Cluster (CCC) and Danish Proof-of-Concept funding.
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J.S.D. was responsible for the experimental work. P.T. designed the conversion module. J.S.D. performed the numerical modelling. All authors discussed the results. All authors contributed to preparation of the manuscript.
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Dam, J., Tidemand-Lichtenberg, P. & Pedersen, C. Room-temperature mid-infrared single-photon spectral imaging. Nature Photon 6, 788–793 (2012). https://doi.org/10.1038/nphoton.2012.231
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DOI: https://doi.org/10.1038/nphoton.2012.231
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