High performance infrared magnetoplasmonics with transparent conductive oxide nanostructures

Magnetoplasmonics, the combination of magnetic fields and light polarization to actively and remotely modulate the plasmonic response of nanostructures triggered significant improvements in optical nanodevices for telecommunications and refractometric sensing. Two main factors guide the design of high performance magnetoplasmonic platforms: a strong modulation of the plasmonic response and a sharp plasmon resonance. Within this framework, noble metal nanocrystals [1], nickel ferromagnetic nanodisks [2] or hybrid bimetallic nanostructures [3] have been proposed. While noble metals offer relatively sharp resonances, their weak magnetic response limits applicability. On the other hand, hybrid or ferromagnetic magnetoplasmonic nanostructures offer strong field response, at the cost of severely broadened resonances.