Presentation Information
[21p-P16-11]Experimental Demonstration of Chemical-Structure Sensitive Nonlinear Dynamic Light Scattering of Stimulated Raman Scattering
〇(PC)Keisuke Seto1, Takayoshi Kobayashi2, Eiji Tokunaga1 (1.Tokyo Univ. Sci., 2.NYCU)
Keywords:
stimulated Raman,dynamic light scattering,correlation spectroscopy
Dynamic light scattering (DLS) evaluates diffusion constant in a colloidal system based on fluctuation in refractive index. The diffusion constant reflects mesoscopic structures such as particle size distribution and correlation length in a gel. However, DLS lacks chemical resolution power or selectivity since the scattered field originates in the spatial Fourier component of the refractive index. We have proposed a molecular vibration-selective nonlinear dynamic light scattering (NLDLS) method of stimulated Raman scattering (SRS). In this methodology, the intensity of the pump beam (in the pump/probe terms) is sinusoidally modulated by interference between the two pump beams to extract the spatial Fourier component of the SRS effect. In the presentation, we will experimentally demonstrate the NLDLS of SRS. This method realizes the analysis of chemical-structure-resolved mesostructure and chemical interactions in the colloidal system.