Volumetric-enhanced Raman Spectroscopy Using Microstructured Optical Fibers

This article studied volumetric-enhanced Raman signal propagation with a high refractive index liquid infiltrated into the air core, which altered the fundamental waveguide property of the microstructured optical fibers. Different waveguide enhancement effects were obtained by detecting food oil with two fibers with different microstructures. By analyzing the transmission characteristics of different waveguides with finite element software, the experimental phenomena are explained, and the existing theoretical models of volumetric-enhanced Raman are supplemented. The effect of waveguide confinement loss in Raman signal detection is emphasized, which has significance for hollow waveguide selection in Raman detection.