Abstract

In recent years, there has been an increased interest in the enhancement, localization and control of optical phenomena in metallic nanostructures [1]. The enhancement of optical responses in such nanostructures is notably affected by sample geometry and input field dependent plasmon resonances [2]. Visualizing the optical responses of such nanostructures locally, therefore, provides a scheme to investigate the physical mechanisms behind the response. Just recently, parabolic mirror assisted, tip-enhanced photoluminescence was used to characterize a nanocone-tip antenna [3]. Here, we show that second harmonic generation (SHG) imaging using cylindrical vector beams permits highly sensitive mapping of the local response in a gold nanocone array.

© 2011 Optical Society of America