Abstract
We experimentally demonstrate enhanced light-graphene interactions aided by the surface plasmons sustained in bicontinuous structure of nanoporous gold (NPG) film in visible wavelengths. Coupling with such amorphous metallic structure enables broadband and wide-angle absorption enhancement of graphene. The average absorption enhancement at normal incidence is at one-order of magnitude larger than that of pristine graphene, to be 25.6%. In addition, the strong near electric fields at the surface proximity of NPG film greatly promote the Raman scattering of graphene up to one order of magnitude for either 514.5- or 632.8-nm laser excitation. Our study shows that NPG film is a promising platform in graphene-integrated applications in visible regime such as photodetectors and light-harvesting devices.
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