title: Electronically resonant third-order sum frequency generation spectroscopy using a nanosecond white-light supercontinuum.
abstract: Third-order sum frequency generation (TSFG) is one of the third-order nonlinear optical processes, and has the generation mechanism analogous to third harmonic generation (THG). By using a white-light supercontinuum, we can obtain broadband multiplex TSFG spectra. In the present study, we developed an electronically resonant TSFG spectrometer, and applied it to obtain TSFG spectra of hemoproteins. Analyzed TSFG ratio spectra clearly showed the resonant enhancement attributable to the electronic state of hemoproteins. This is a promising method for the imaging of electronic states of molecules inside living cells or tissues.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Segawa
authors.forename: Naoki
authors.initials: N
authors.lastname: Fukutake
authors.forename: Philippe
authors.initials: P
authors.lastname: Leproux
authors.forename: Vincent
authors.initials: V
authors.lastname: Couderc
authors.forename: Takeaki
authors.initials: T
authors.lastname: Ozawa
authors.forename: Hideaki
authors.initials: H
authors.lastname: Kano