New method for mid-infrared spectroscopy at room temperature using non-linear optics in photon-counting regimeAbhishek Rai, Ludovic Grossard, François Reynaud, Mathieu Chauvet and Florent BassignotEPJ Web Conf., 335 (2025) 03031DOI: https://doi.org/10.1051/epjconf/202533503031