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Plasmonic Response of Individual Gold Nano-Octahedron Using Cathodoluminescence Spectroscopy and Imaging

We performed cathodoluminescence (CL) spectroscopy and imaging in a scanning electron microscope (SEM) to investigate localized surface plasmon (LSP) assisted optical effects arising in the substrate supported single tilted gold octahedron of side edge length 170 nm. The site specific
 e-beam excitation reveals a single resonant peak around 580 nm. Stronger photon emission is observed in the visible region from those corners and tip of the octahedron which are situated far from the substrate. The experimental results corroborate well with the finitedifference time-domain
 (FDTD) numerical simulation. Using extensive FDTD simulation we also show that the observed radiative mode is higher order mode other than the dipolar mode and also discuss their dependency on the Si Substrate. Our findings provide a better understanding of the plasmon induced luminescence
 from the octahedron nanoparticle at single particle level that might have far reaching consequences in various novel applications ranging from biological and chemical sensors to enhanced photovoltaic devices.