A Comprehensive Numerical Study on Fiber Optic SERS Probe Design

A fiber optic surface-enhanced Raman spectroscopy (SERS) probe has emerged as a promising solution for remote and label-free chemical sensing. However, unlocking its full potential still requires enhancing the SERS enhancement factors, which depends on two key aspects: improving the local field enhancement and efficient collection of Raman dipole moment through the fiber. Meeting this challenge requires a thorough understanding of parameters influencing the sensitivity of fiber optic SERS probes and the finding of the most effective configuration for maximizing SERS sensitivity. In our extensive numerical study, we delve into the intricate interplay among plasmonic nanostructures, excitation wavelength, fiber material properties, and SERS enhancement within a water environment. By unraveling the synergistic effects of these elements, our research pinpoints the customized parameter set that achieves maximum performance across diverse variables tailored specifically for remote chemical sensing applications.