Tents, Chairs, Tacos, Kites, and Rods: Shapes and Plasmonic Properties of Singly Twinned Magnesium Nanoparticles.

摘要: Nanostructures of some metals can sustain light-driven electron oscillations called localized surface plasmon resonances, or LSPRs, that give rise to absorption, scattering, and local electric field enhancement. Their resonant frequency is dictated by the nanoparticle (NP) shape size, fueling much research geared toward discovery control new structures. LSPR properties also depend on composition; traditional, rare, expensive noble (Ag, Au) are increasingly eclipsed earth-abundant alternatives, with Mg being an exciting candidate capable sustaining resonances across ultraviolet, visible, near-infrared spectral ranges. Here, we report numerical predictions experimental verifications a set shapes based NPs displaying various twinning patterns including (1011), (1012), (1013), (1121), create tent-, chair-, taco-, kite-shaped NPs, respectively. These strikingly different from what obtained for typical plasmonic because crystallizes in hexagonal close packed structure, as opposed cubic Al, Cu, Ag, Au. A survey optical response structures, well effect size aspect ratio, reveals their rich array which supported single-particle scattering experiments. Further, corresponding studies near-field distribution via scanning transmission microscopy electron-energy loss spectroscopy unravels mode nature unlike those either plates cylindrical rods. made Mg, provide interesting ways light at nanoscale