Magneto-optical functionalized surfaces for sensing applications

Magneto-plasmonic resonant structures, which combine magnetic and metallic materials, are well known for improving biosensing and magnetic field detection. However, these structures suffer from low optical quality resonances (reflection dip) caused by the high absorption of plasmonic oscillations, which limits their practical applications. This paper proposes low-loss optical planar structures that may hold great promise for sensing applications. The first ones are unconventional magneto-plasmonic devices optimized for a so-called configuration “optical switch” [1]. The structure consists of a 1D deep sinusoidal gold grating covered by a thin cobalt layer. The second ones are all-dielectric devices made of a magneto-optical nanocomposite layer with a 1D photoresist grating on top [2]. Such magneto-optical devices are easy to implement and cost-effective, providing a very promising approach for magnetic field sensors, or biosensing in a both directions magnetized biased configuration. [1] A. V. Tishchenko and O. Parriaux, doi: 10.1109/JPHOT.2015.2445766. [2] Laure Bsawmaii et al. doi : https://doi.org/10.1364/OME.447030