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Infrared (IR) hyperspectral imaging is a well-established method for non-destructive and label-free analysis of biological samples, finding use, e.g., in the classification of tissue sections in histopathology [1]. The underlying spectroscopy provides information on the chemical content of the sample by probing molecular bonds with resonances in the “fingerprint region” (500-4000 cm-1). Spatial information is traditionally obtained in wide-field geometry or by raster scanning. Recently, field-resolved spectroscopy (FRS), capturing the response to a coherent IR excitation on the level of the IR electric field has demonstrated advantages related to detection sensitivity and dynamic range [2], favorable scaling of the signal for strongly-absorbing samples [3] and sub-infrared-wavelength spatial resolution [4].
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