Plasmon-enhanced energy transfer in hybrid porous structures for luminescent sensors

A hybrid nanostructure consisting of an island silver film coated with nanoporous aluminum oxide obtained by anodic oxidation of a metallic aluminum film was synthesized and studied. In the presence of silver nanoparticles, the intrinsic luminescence of anodic aluminum oxide, caused by the presence of luminescent centers in its structure, is enhanced. Application of the Rhodamine 6G dye to the synthesized nanostructure leads to quenching of the luminescent centers of aluminum oxide with a simultaneous increase in the luminescence intensity of the dye, which indicates effective excitation transfer from the luminescent centers to the dye in the presence of silver nanoparticles with plasmon resonance in a close frequency band. The synthesized structure can find application in optical sensors and receivers of optical radiation.