The enhancement of a dissolved chemical's Raman scattering by a liquid-core optical fiber (LCOF) geometry is absorption dependent. This dependence leads to a disruption of the usual linear correlation between chemical concentration and Raman peak area. To recover the linearity, we augmented a standard LCOF Raman spectroscopy system with spectrophotometric capabilities, permitting sequential measurements of Raman and absorption spectra within the LCOF.
Measurements of samples with identical Raman-scatterer concentrations but different absorption coefficients are described. Using the absorption values,
we reduced variations in the measured Raman intensities from
© 2006 Optical Society of America
Vol. 1, Iss. 2 Virtual Journal for Biomedical Optics
Dahu Qi and Andrew J. Berger, "Correction method for absorption-dependent signal enhancement by a liquid-core optical fiber," Appl. Opt. 45, 489-494 (2006)