Development of a Linear Dichroism Measurement System Using Slab Optical Waveguides and the in situ Observation of Adsorption Process of Dye Molecules onto Glass Surface

摘要

A linear dichroism measurement system using slab optical waveguides was developed for observations of the adsorption process of dye molecules onto a glass surface. The absorption spectra of the dye molecules in the TM mode and those in the TE mode were measured alternately with the present system at a rate of 2.5 Hz; thus, the continuous change of the average orientation angle (theta(d)) of dye molecules during the adsorption process were monitored. The present system was applied to observations of the adsorption of 5, 10, 15, 20-tetrakis(4-carboxyphenyl)-21H,23H-porphyrin (TCPP) and 5, 10, 15, 20-tetrakis (N-methylpyridinium-4-yl)-21H,23H-porphyrin (TMPyP) onto a silylated glass surface and a bare glass surface.