Polarization and azimuthal angle dependence of the optical second harmonic generation from Pt nanowires on the MgO(110) faceted template

摘要

We have measured azimuthal angle dependence of the optical second-harmonic (SH) intensity from Pt nanowire arrays on the faceted MgO(110) substrates. The cross-sectional shapes of the fabricated Pt nanowires were also observed by transmission electron microscopy. The observed SH intensity patterns as a function of the sample rotation angle around the surface normal were characterized by the effective nonlinear susceptibility arising from the C _s symmetry of the Pt nanowire arrays. The correlation of the cross-sectional shapes of the wires and their nonlinear susceptibility is discussed.