Near-field Raman spectra of GMO single crystal

In order to observe the lattice vibration in nano-scale, we have developed a new type of scanning near-field Raman scattering system by combining scanning atomic force microscopy with microprobed Raman scattering spectroscopy. A special designed cantilever with aperture of about 150 nm in diameter was used both as an illumination nano-source and a nano-detector of scattering light. Near-field Raman spectra of the vi internal modes Of MoO4 molecules in the GMO single crystal were observed at its cleavage surface at room temperature. The spectrum is compared with that obtained by a conventional Raman microscope. With using the piezoelectric stage, the sample was scanned in nano-scale and near-field Raman spectra were observed as a function of position on the surface.