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Plasmonic Magnesium Nanoparticles

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If you have a question about this talk, please contact Joseph Nelson.

Localized surface plasmon resonances have attracted much attention due to their ability to enhance light-matter interactions and manipulate light at the sub-wavelength level. Recently, alternatives to the rare and expensive noble metals Ag and Au have been sought for more sustainable and large-scale plasmonic utilization. Mg supports plasmon resonances, is one of the most abundant elements in earth’s crust, and is fully biocompatible, making it an attractive framework for plasmonics.

This talk first discusses the hexagonal, folded, and kite-like shapes we modelled using Crystal Creator, our Wulff-based shape generation code for twinned nanoparticles. Nanoparticles found in colloidal syntheses are then presented and match well with predictions. Then, the optical response of Mg nanoparticles is overviewed, highlighting Mg’s ability to sustain localized surface plasmon resonances across the ultraviolet, visible, and near-infrared electromagnetic ranges. The various resonant modes of hexagons, leading to the highly localized electric field characteristic of plasmonic behavior, are presented numerically and experimentally. The evolution of these modes and associated field from hexagons to the lower symmetry folded structures is then probed, again by matching simulations, optical, and electron spectroscopy data. Lastly, results demonstrating the opportunities and challenges related to the high chemical reactivity of Mg are discussed, including surface oxide formation and galvanic replacement as a synthetic tool for bimetallics.

This talk will be held online using Zoom. Please register your email address here to receive Zoom links via email.

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This talk is part of the MSM-AIMR Joint Online Workshop 2020 series.

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