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Interference in edge-scattering from monocrystalline gold flakes

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posted on 2023-11-30, 06:15 authored by Sergejs Boroviks, Christian Wolff, Jes Linnet, Yuanqing Yang, Francesco Todisco, Alexander S. Roberts, Sergey I. Bozhevolnyi, Bert Hecht, N. Asger Mortensen
We observe strongly dissimilar scattering from two types of edges in hexagonal quasi-monocrystalline gold flakes with thicknesses around 1 micron. We identify as the origin the interference between a direct, quasi-specular scattering and an indirect scattering process involving an intermediate surface-plasmon state. The dissimilarity between the two types of edges is a direct consequence of the three-fold symmetry around the [111]-axis and the intrinsic chirality of a face-centered cubic lattice. We propose that this effect can be used to estimate flake thickness, crystal morphology, and surface contamination.

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