Metal-Interface Second Harmonic Generation from Pt/Cu Bimetallic Nanowire Arrays on NaCl(110) Faceted Templates

Abstract

We have obtained the azimuthal angle dependence of the second harmonic (SH) intensity from bimetallic Pt/Cu and Pt/SiO/Cu nanowire arrays. The arrays were fabricated by shadow deposition on NaCl(110) faceted templates. The SH intensity from the Pt/Cu nanowire array measured in S_in/S_out polarization combination were 4.7 times larger than that from the Pt/SiO/Cu nanowire array at the fundamental photon energy of 2.33 eV. Phenomenological analysis of the intensity patterns and numerical calculation of the local fields have shown that the inversion symmetry broken at the metal-metal interface is responsible for the enhanced SH generation from the Pt/Cu bimetallic nanowire arrays. [DOI: 10.1380/ejssnt.2009.831]