Fig. 6: BSTP imaging of the interface between DMSO and oil.
From: Bond-selective transient phase imaging via sensing of the infrared photothermal effect
a Measured FTIR spectra of the DMSO and oil samples. b Raw phase image of the interface between DMSO and oil. c–f BSTP images of the interface with IR illumination at 2850, 2912, 3000 and 3100 cm−1. The dashed circle marks the IR heating spot. Note that the IR beam shifted positions at different wavelengths due to laser pointing; therefore, we adopted a larger field of view in phase imaging to cover the shifting of the IR focus.
