The optical properties of composed nanosphere system with chiral molecules and metal are investigated by extended Mie theory.The results show that when circularly polarized light incident the spherical shell structure of Au@ chiral_ molecule @Au, chiral molecules interact with surface plasmons and Au core hybrid with Au shell layer resulting in circular dichroism(CD) response, Rabi splitting and analogous exciton induce transparency in the resonance position. When molecules′ response peak position is near infrared, the phenomenon will be more obvious. The ability of chiral molecules induce plasmonic chirality can be improved by increasing mode volume by increasing the thickness and oscillator strength of chiral layer. Thickened Au layer interacting with Au shell induced lager CD signal by producing strong chiral field.

spherical-shell structure;strong interaction;surface plasmon;chiral molecule;Mie theory