Optical device for use in plasmon resonance

摘要

An optical device having a structure which contains a metallic layer (1) and enables excitation of plasmon resonance. In order to prevent oxidation of the metallic layer (1), the metallic layer (1) is covered with a film (2) made of a mercapto compound containing a benzene ring and/or a hetero ring, or a reductive compound containing a metal-binding group (4) which can be bound to the metal of which the metallic layer (1) is made.