Abstract
Noble metals with well-defined crystallographic orientation constitute an appealing class of materials for controlling light–matter interactions on the nanoscale. Nonlinear optical processes, being particularly sensitive to anisotropy, are a natural and versatile probe of crystallinity in nano-optical devices. Here we study the nonlinear optical response of monocrystalline gold flakes, revealing a polarization dependence in second-harmonic generation from the {111} surface that is markedly absent in polycrystalline films. Our findings confirm that second-harmonic microscopy is a robust and non-destructive method for probing the crystallographic orientation of gold, and can serve as a guideline for enhancing nonlinear response in plasmonic systems.
Original language | English |
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Journal | Optics Letters |
Volume | 46 |
Issue number | 4 |
Pages (from-to) | 833-836 |
ISSN | 0146-9592 |
DOIs | |
Publication status | Published - 2021 |