Energy Efficient Single Pulse Switching of [Co/Gd/Pt]_N Nanodisks Using Surface Lattice Resonances

Abstract

The impact of plasmonic surface lattice resonances on the magneto-optical properties and energy absorption efficiency has been studied in arrays of [Co/Gd/Pt] N multilayer nanodisks. Varying the light wavelength, the disk diameter, and the period of the array, it is demonstrated that surface lattice resonances allow all-optical single pulse switching of [Co/Gd/Pt] N nanodisk arrays with an energy 400% smaller than the energy needed to switch a continuous [Co/Gd/Pt] N film. Moreover, the magneto-optical Faraday effect is enhanced at the resonance condition by up to 5,000%. The influence of the disk diameter and array period on the amplitude, width and position of the surface lattice resonances is in qualitative agreement with theoretical calculations and opens the way to designing magnetic metasurfaces for all-optical magnetization switching applications.

Multiphysics Modeling of Plasmon-Enhanced All-Optical Helicity-Dependent Switching

“…Additionally, the induced electron temperature has a Gaussian-like intensity distribution, which is similar to the localized electromagnetic field distribution. Recently, it has been shown that surface lattice resonance can be utilized to control the distribution of electric fields and thereby regulate the efficacy of ultrafast demagnetization and all-optical switching. ,, Although we focus on localized surface plasmon resonance in the present work, our multiphysics model can be readily applied to investigate the influence of surface lattice resonance on ultrafast magnetism at the nanoscale.…”

All-optical spin switching on an ultrafast time scale

“…Recently Pezeshki et al [158] proposed an integrated hybrid plasmonic-photonic device that is based on AOS. Verges et al [159] showed that using [Co/Gd/Pt] N nanodisks, instead of their films, reduces the energy to have a single pulse switching by 400%. We are hopeful that new and often surprising breakthroughs are possible in the next decade.…”

Non-degenerate magneto-optical pump-probe spectroscopy of thermal and nonthermal spin dynamics in magnetic and magnetoplasmonic materials with sub-15 fs time resolution

“…Recently, Kiriliyuk and co-workers observed thermal demagnetization dynamics in TbCo alloy driven by plasmonic excitations in nanoscale Ag rings 88 , and a similar approach was also reported by Stupakiewicz and colleagues in Au/YIG:Co magneto-plasmonic crystals 89,90 . Finally, in two recent independent works, it has been shown that plasmon-enhanced phenomena can drive more efficient magnetization dynamics and switching 91,92 . Again, all these pioneering studies are limited by the duration of the light pulses used to either excite or probe the magnetization dynamics, thus hindering the possibility to access sub-100 fs magnetic processes in magnetoplasmonic nanomaterials in pump-probe experiments.…”