Abstract
We have measured optical second harmonic (SH) intensity from Pt nanowires with modified ellipsoidal cross sections on the MgO(110) faceted template. The observed SH intensity patterns as a function of the sample rotation angle φ around the surface normal were characterized by the effective nonlinear susceptibility arising from Cs symmetry of the Pt nanowires. The effective nonlinear susceptibility element χ222 was observed dominantly with the suffix 2 representing the [1 -1 0] direction of the MgO substrate. Other nonlinear susceptibility elements were also detected and their origins are discussed.
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