title: Broadband near-field mid-infrared spectroscopy and application to phonon resonances in quartz.
abstract: Infrared (IR) spectroscopy is a versatile analytical method and nano-scale spatial resolution could be achieved by scattering type near-field optical microscopy (s-SNOM). The spectral bandwidth was, however, limited to approximately 300 cm(-1) with a laser light source. In the present study, the development of a broadband mid-IR near-field spectroscopy with a ceramic light source is demonstrated. A much wider bandwidth (at least 3000 to 1000 cm(-1)) is achieved with a ceramic light source. The experimental data on quartz Si-O phonon resonance bands are well reproduced by theoretical simulations indicating the validity of the present broadband near-field IR spectroscopy.
authors.affiliation: Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka, Japan. mishikawa@ess.sci.osaka-u.ac.jp
authors.forename: Michio
authors.initials: M
authors.lastname: Ishikawa
authors.forename: Makoto
authors.initials: M
authors.lastname: Katsura
authors.forename: Satoru
authors.initials: S
authors.lastname: Nakashima
authors.forename: Yuka
authors.initials: Y
authors.lastname: Ikemoto
authors.forename: Hidekazu
authors.initials: H
authors.lastname: Okamura
mesh_terms: D003198:Computer Simulation; D060733:Electromagnetic Radiation; D006046:Gold / Q000737:chemistry; D008027:Light; D008855:Microscopy, Electron, Scanning / Q000379:methods; D015233:Models, Statistical; D055095:Optics and Photonics / Q000379:methods*; D060739:Phonons; D011791:Quartz; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012825:Silicon / Q000737:chemistry; D013055:Spectrophotometry, Infrared / Q000379:methods*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods
chemical_list: D011791:Quartz; D006046:Gold; D012825:Silicon