Tunable Chiroptical Response of Chiral Plasmonic Nanostructures Fabricated with Chiral Templates through Oblique Angle Deposition

Abstract

Chiral plasmonic nanostructures (CPNs) with a strong chiroptical response in visible and near-infrared regions were fabricated with homemade SiO2 chiral templates through oblique angle deposition. The circular dichroism spectra of the CPNs showed that the chiroptical response was amplified with increased deposition thickness of silver. Simulation results demonstrated that only the magnetic dipole mode was excited when the deposition thickness was small. Magnetic and electric dipoles emerged and coupled to each other with increased silver deposition thickness. As a result, chiroptical enlargement occurred. This study provides a concise method of fabricating CPNs with a tunable chiroptical response.