title: Tip-enhanced coherent anti-stokes Raman scattering for vibrational nanoimaging.
abstract: An electric field enhanced by a metallic nanoprobe has locally induced coherent anti-Stokes Raman scattering (CARS) of adenine molecules in a nanometric DNA network structure. Owing to the third-order nonlinearity, the excitation of the CARS polarization is extremely confined to the end of the tip apex, resulting in a spatial resolution far beyond the diffraction limit of light. Our tip-enhanced CARS microscope visualized the DNA network structure at a specific vibrational frequency (approximately 1337 cm(-1)) corresponding to the ring-breathing mode of diazole of adenine molecules.
authors.affiliation: Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan.
authors.forename: Taro
authors.initials: T
authors.lastname: Ichimura
authors.forename: Norihiko
authors.initials: N
authors.lastname: Hayazawa
authors.forename: Mamoru
authors.initials: M
authors.lastname: Hashimoto
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Inouye
authors.forename: Satoshi
authors.initials: S
authors.lastname: Kawata