Far-Field Radiation of Three-Dimensional Plasmonic Gold Tapers near Apexes.

ABSTRACT: Three-dimensional plasmonic gold tapers are widely used structures in nano-optics for achieving imaging at the nanometer scale, enhanced spectroscopy, confined light sources, and ultrafast photoelectron emission. To understand their radiation properties further, especially in the proximity of the apex at the nanoscale, we employ cathodoluminescence spectroscopy with high spatial and energy resolution. The plasmon-induced radiation in the visible spectral range from three-dimensional gold tapers with opening angles of 13° and 47° is investigated under local electron excitation. We observe a much weaker radiation from the apex of the 13° taper than from that of the 47° taper. By means of finite-difference time-domain simulations we show that for small opening angles plasmon modes that are cr

SUBMITTER: Guo S 

PROVIDER: S-EPMC6804427 | biostudies-literature | 2019 Oct

REPOSITORIES: biostudies-literature