Submicron-resolving infrared absorption spectroscopy and analysis in fingerprint region utilizing a free electron laser

Submicron-resolving infrared near-field absorption spectroscopy was achieved in fingerprint region by employing a free-electron laser at Tokyo University of Science as a tunable and bright IR light source and a custom-made cantilever probe with a 0.5 μm aperture as a near field probe. Infrared near-field imaging/spectroscopy between 8.3 and 8.7 μm wavelengths convincingly demonstrated observation of dissociation of the C–O–C bonds in cholesteryl oleate with submicron resolution.