Surface-enhanced Raman scattering substrate based on surface plasmon polariton local-field coupling effect and preparation method of surface-enhanced Raman scattering substrate

The invention discloses a surface-enhanced Raman scattering substrate based on a surface plasmon polariton local-field coupling effect and a preparation method of the surface-enhanced Raman scattering substrate, and relates to a molecular detection and recognition technique and a preparation method of a metal micro/nano structure. The surface-enhanced Raman scattering substrate consists of the metal micro/nano structure with nano-scale gaps. The surface plasmon polariton local-field coupling effect exists in the gaps. The specific types of the surface-enhanced Raman scattering substrate comprises an Ag nano particle and Ag membrane coupling system, an Ag nano particle and Ag nano aperture array coupling system, and an Ag nano sphere cap and Ag nano aperture coupling system. The preparation method comprises a wet chemical method and a vacuum thermal evaporation deposition method. The preparation method of the surface-enhanced Raman scattering substrate is safe, simple and convenient, complex equipment is not required, the cost is low, the structure is stable and controllable, the repeatability is high and high enhanced factors can be provided at the same time.