RCWA Simulation Study of Enhanced Infrared Absorption Spectroscopy by Au Nanoparticle Array Combined with Optical Cavity Effect

Surface-enhanced infrared absorption is a phenomenon by which the infrared absorption intensity of molecules near metal nanoparticles (NPs) is increased considerably. In surface-enhanced infrared absorption spectroscopy, the absorption intensity depends on the strength of the field acting on the NPs layer. The optical cavity effect generates a strong electric field. If this strong electric field is applied to the NPs, then the IR absorption intensity will be enhanced further. This simulation study assessed the possibility of applying the enhanced electric field generated by the pseudo-optical cavity effect to the NP array. Results indicated that the IR absorption is markedly enhanced