Abstract
A novel dimeric arrangement consisting of two spherical nanocrescents with tips pointing at each other in nanometer proximities is proposed. Hybridization of the plasmonic modes in close proximities leads to a 48% enhancement in Purcell factor inside the gap compared to the single spherical nanocrescent. A nanometer resolved tomographic cathodoluminescence (CL) spectroscopy combined with radiative local density of optical states (LDOS) calculation have been utilized to investigate bright surface plasmon modes of the nanocrescent in three dimensions. In this work, the retarded full Maxwell equations are solved using the boundary element method (BEM) with the electron beam and point dipole sources. Then, tomographic reconstructions are produced from a set of 2D CL maps in different orientations via the simultaneous iterative reconstruction technique (SIRT). The procedure of achieving CL tomograms and its connection to radiative LDOS are, first, validated for well-established cylindrical nanocrescent and then applied to the spherical nanocrescent dimer. The new proposed plasmonic dimer with promising radiative optical properties obtained in three dimensions shows enormous potential to play the main role in applications such as in vivo biosensing based on plasmonic-enhanced fluorescence and also surface-enhanced Raman spectroscopy (SERS).
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