Abstract

An optical waveguide capillary cell (OWCC) has been used for signal enhancement in Raman scattering spectroscopy, colorimetry, and fluorometry. When the cell, hollow capillary tubing, is filled with a solvent that has a refractive index higher than that of the cell material, it forms a liquid-core optical fiber and it can be elongated to extreme length. Table I summarizes the refractive indices of various organic solvents and cell materials. As shown in the table, when capillary tubing made of borosilicate glass or quartz glass is used, only a few organic solvents such as carbon disulfide and toluene can be used—which greatly limits the applicability of this method.

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