Tunable High-Q Factor Substrate for Selectively Enhanced Raman Scattering

Most Surface-enhanced Raman scattering (SERS) substrates enhance all the signals in a relative broad spectral range. The both interested and background together. To improve identification of target molecules from numerous ones, with multi high-quality (Q) factor resonance wavelengths can be designed to achieve selective enhancement specific transitions. When frequencies are modulated match excitation frequencies, detection molecule more effective. In this paper, we design tunable high-Q SERS substrate periodic silver bowtie nanoholes on silica spacer film. possessed three high electric field modes, which resulted interaction localized surface plasmon (LSPR) nanoholes, polariton (SPP) period Fabry–Perot (FP) between film bottom. these modes not only higher quality factor, but also field, employed realize potential high-sensitivity selective-detection fields.