Plasmonic ratchet wheels: switching circular dichroism by arranging chiral nanostructures.
basic_science · Level V
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- Record sourced from PubMed, PMID 19863052.
- Also identified by DOI 10.1021/nl9021623.
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Abstract
We demonstrate circular dichroism (CD) in the second harmonic generation (SHG) signal from chiral assemblies of G-shaped nanostructures made of gold. The arrangement of the G shapes is crucial since upon reordering them the SHG-CD effect disappears. Microscopy reveals SHG "hotspots" assemblies, which originate in enantiomerically sensitive plasmon modes, having the novel property of exhibiting a chiral geometry themselves in relation with the handedness of the material. These results open new frontiers in studying chirality.