We have measured the optical second-harmonic (SH) intensity spectra from an array of Au nanowires of average width 60 nm on a faceted NaCl(110) template. For the s-polarized input and p-polarized output polarization combination, the SH intensity with the incident field parallel to the nanowire axes was much stronger than that with the incident field perpendicular to the axes. The anisotropy is attributed to the anisotropic depolarization field in the Au nanowires.
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Kitahara et al. (2004) studied this question.
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