Anisotropic second-harmonic generation from monocrystalline gold flakes

Sergejs Boroviks, Torgom Yezekyan, Álvaro Rodríguez Echarri, F. Javier García de Abajo, Joel D. Cox, Sergey I. Bozhevolnyi, N. Asger Mortensen, Christian Wolff*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


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 languageEnglish
JournalOptics Letters
Issue number4
Pages (from-to)833-836
Publication statusPublished - 2021


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