Photothermal Microscopy and
Spectroscopy Webinar

Infrared Photothermal Heterodyne Imaging (IR-PHI) is now a well-established, chemical and morphological characterization technique widely applicable to environmental and material science applications. Examples include studying micro- and nanoplastics in spectrally complex, chemical environments as well as monitoring cation migration in hybrid lead halide perovskites. IR-PHI has a spatial resolution of ~ 300 nm and works in a point-by-point scanning fashion. Time-expensive, single-point data acquisition limits image collection and subsequent material characterization. We now introduce a widefield modality to IR-PHI where photothermal IR images are acquired using a high-speed CMOS camera. The approach parallelizes data collection and makes possible fast image collection as well as hyperspectral imaging of specimens. Widefield image resolution and detection limits are established and compared with those of traditional IR-PHI.