Magneto-optical response in bimetallic metamaterials

• Main Authors: Atmatzakis, Evangelos, Papasimakis, Nikitas, Fedotov, Vassili, Vienne, Guillaume, Zheludev, Nikolay I.
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2018
• Subjects: Magnetoplasmonics; Metamaterials; DRNTU::Engineering::Electrical and electronic engineering
• Online Access: https://hdl.handle.net/10356/89788; http://hdl.handle.net/10220/46367
• Institution: Nanyang Technological University

We demonstrate resonant Faraday polarization rotation in plasmonic arrays of bimetallic nano-ring resonators consisting of Au and Ni sections. This metamaterial design allows the optimization of the trade-off between the enhancement of magneto-optical effects and plasmonic dissipation. Nickel sections corresponding to as little as ~6% of the total surface of the metamaterial result in magneto-optically induced polarization rotation equal to that of a continuous nickel film. Such bimetallic metamaterials can be used in compact magnetic sensors, active plasmonic components, and integrated photonic circuits.