Abstract
Abstract Localized and intense field confinement near metallic plasmonic nanostructures has enabled a wealth of breakthrough applications in state-of-the-art sensing and single-molecule detection. Herein, using the quantum mechanical calculations, we investigate the optical and plasmonic properties of a cube-shaped nanoparticle cluster made of eight identical metal nanoparticles. We demonstrate that the absorption profile, response charge density and field enhancements are exquisitely sensitive to the interparticle gap distance. Among other insights, we reveal the emergence of charge-transfer plasmons (CTPs) and electron tunnelling mediated plasmons (ETMPs). Our quantum calculations yield quantitative access to the field enhancements and may help in the design of new optical devices having close-packed nanoparticle clusters as building blocks.
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