Surface-plasmon-enhanced photoelectron emission from nanostructure-covered periodic grooves on metals

Abstract

In this paper, we find that the resonant angle of surface plasmons (SPs) excited on a unique type of nanostructure-covered laser-induced periodic surface structure (NC-LIPSS) on platinum can be significantly different from the calculated value based on regular periodic grooves. We believe that this SP resonant angle shift is caused by an increase in the real part of the effective refractive index at the air-metal interface. We also find that the excitation of SPs can significantly enhance photoelectron emission on NC-LIPSSs.