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Time-resolved mid-infrared photothermal imaging is discussed to study heat diffusion dynamics in various complex environments including water interfaces and nanoparticle clusters. Boxcar detection enables the extraction of hyper-temporal image stacks along with local temporal traces of the photothermal signal with high a signal-to-noise ratio and no complex post-processing. Environments with multiple absorbers in close proximity to each other or features in highly absorbing media can be analyzed with characteristic thermal decay profiles.
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Panagis Samolis, Michelle Y. Sander, "Temporal characterization of mid-infrared photothermal signals at aqueous interfaces," Proc. SPIE PC12681, Ultrafast Nonlinear Imaging and Spectroscopy XI, PC1268109 (6 October 2023); https://doi.org/10.1117/12.2678069