Abstract
The surface plasmonic modes of a side-by-side aligned gold nanorod array supported on a gold substrate has been characterised by electron energy loss spectroscopy (EELS). Plasmonic coupling within the array splits the nanorods’ longitudinal mode into a bright mode (symmetrically aligned dipoles) and a dark mode (anti-symmetrically aligned dipoles). We support this observation by means of finite element modelling (FEM).
Highlights
Metallic nanoparticles exhibit fascinating optical properties based on surface plasmon resonances (SPRs) which could aid in the design of advanced metamaterials
The aim of this work is both to understand the fundamentals involved in plasmonic coupling between nanorods and to investigate the design of high surface area devices based on nanorod arrays coated with thin semiconductor layers, for efficient solar energy conversion
finite element modelling (FEM) of a 30 nm diameter nanorod with aspect ratio (AR) 3 in a vacuum predicts that dipolar plasmonic modes occur in the visible region at ca. 500 nm and 600 nm for transverse and longitudinal modes respectively; the exact position of the latter depending on rod-end geometry
Summary
Metallic nanoparticles exhibit fascinating optical properties based on surface plasmon resonances (SPRs) which could aid in the design of advanced metamaterials. Coupling between SPRs of neighbouring nanoparticles is of interest as it can provide large field enhancements localised between the particles and dramatic shifts in resonance energy. Such a couplinginduced spectral shift has been explained theoretically within the plasmon hydridisation model [3]. This is analogous to molecular orbital theory and, for a strongly coupled nanorod dimer, this predicts two possible arrangements of the dipole moments which give rise to two coupled SP dipolar modes. The aim of this work is both to understand the fundamentals involved in plasmonic coupling between nanorods and to investigate the design of high surface area devices based on nanorod arrays coated with thin semiconductor layers, for efficient solar energy conversion
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