Local electron beam excitation and substrate effect on the plasmonic response of single gold nanostars

Pabitra Das, Abhitosh Kedia, Pandian Senthil Kumar, Nicolas Large, Tapas Kumar Chini
2013 Nanotechnology  
We performed Cathodoluminescence (CL) spectroscopy and imaging in a high resolution scanning electron microscope to locally and selectively excite and investigate the plasmonic property of a multibranched gold nanostar on silicon substrate. This method allows us to map the local density of optical states from the nanostar with a spatial resolution down to a few nanometers. We resolve both in spatial and spectral domain, different plasmon modes associated with the nanostar. Finite- difference
more » ... e-domain (FDTD) numerical simulations are performed to support the experimental observations. We investigate the effect of substrate on the plasmonic property of these complex shaped nanostars. The powerful CL-FDTD combination helps us to understand the effect of the substrate on plasmonic response of branched nanoparticles.
doi:10.1088/0957-4484/24/40/405704 pmid:24029251 fatcat:7dykwzhmyrf2llt3uvqogo6wtu