One of the newest metals for plasmonics is Mg. It is earth-abundant, biocompatible, and has a higher plasmonic quality factor than Al across the visible (and than Au and Cu in the UV-blue). In the past ten years, several fabricated magnesium structures have emerged, demonstrating the optical behaviors expected of plasmonic metals. Recently, our group has developed colloidal syntheses capable of size control from 50 to over 1000 nm,[1] as well as crystallographic models describing the various single crystalline and twinned shapes present in reaction mixtures.[2]<br/>This talk will discuss the effects of varying the size and shape on the optical response of single plasmonic Mg nanoparticles. Experimental results include size effects observed by dark field optical scattering (far-field) as well as size and shape effects observed by monochromated electron energy loss spectroscopy (near-field). These observations are supported and supplemented by numerical calculations using the discrete dipole approximation for both light and electron-beam excitation, which allow us to systematically study the impact of fold angle (for twinned structures) and MgO layer thickness.

Near-field and far-field optical properties of plasmonic magnesium nanoparticles

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ACS Fall 2022

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