1 May 2012 Second harmonic hotspots at the edges of the unit cells in G-shaped gold nanostructures
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We report our latest results on second harmonic generation (SHG) microscopy from arrays of G-shaped chiral gold nanostructures. The nanostructures are arranged in unit cells composed of four Gs, each rotated at 90° with respect to its neighbors. As it has already been demonstrated, for linearly polarized light, these unit cells yield a pattern of four SHG hotspots. However, upon increasing the pitch of the nanostructured arrays, extra hotspots can be observed at the edges of the unit cells. While the origin of these extra hotspots remains to be elucidated, their position indicates a relationship to coupling behavior between the unit cells.
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Ventsislav K. Valev, Edward J. Osley, Ben De Clercq, Alejandro V. Silhanek, Paul A. Warburton, Oleg A. Aktsipetrov, Marcel Ameloot, Victor V. Moshchalkov, Thierry Verbiest, "Second harmonic hotspots at the edges of the unit cells in G-shaped gold nanostructures", Proc. SPIE 8423, Metamaterials VII, 842311 (1 May 2012); doi: 10.1117/12.921523; https://doi.org/10.1117/12.921523

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