Abstract
Surface-enhanced Raman scattering (SERS) has been widely used to realize considerable enhancement of Raman scattering, while most SERS substrates enhance all the Raman signals in a relative wide spectral range. Selective enhancement of specific Raman shifts is also important in order to directly identify a target molecule from numerous background ones. In this paper, we design a SERS substrate with periodic silver nanoholes on silica spacer and silver film. The substrate possesses three resonance modes, which are excited by the localized surface plasmon resonance (LSPR) of nanoholes, the surface plasmon polariton (SPP) of period holes and the Fabry–Perot (FP) resonance between silver film mirror and nanoholes respectively. The interaction between those resonance modes results in higher Q factor, which will be applicable for selective Raman enhancement. With matching the three resonance modes to the exciting frequency and two selected Raman frequencies of R6G (Rhodamine 6G) respectively, experimental results show that the Raman signals with the triple resonance substrate at the matched frequencies can be enhanced ten times larger than the case of periodic silver nanoholes on silica substrate only with single resonance. At the same time, the matched two selected Raman signals can be enhanced about three times larger than the mismatched ones. Therefore, considering the two selectively enhanced Raman signals simultaneously can help to improve the molecule identification about one order of magnitude. This selective enhancement property provides a potential method to directly identify target molecule without spectral spectrophotometry system.
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