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Large-Area 3D Chiral Plasmonic Structures
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DOI：10.1021/nn402370x.png)
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Abstract
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We manufacture large-area plasmonic structures featuring 3-dimensional chirality by colloidal nanohole lithography. By varying the polar rotating speed of the samples during gold evaporation, we can fabricate spiral-type ramp nanostructures. The optical properties show chiroptical resonances in the 100 to 400 THz frequency region (750 to 3000 nm), with circular dichroism values of up to 13%. Our method offers a simple low-cost manufacturing method of cm(2)-sized chiral plasmonic templates for chiroptical applications such as stereochemical enantiomer sensors.
Keywords:
hole-mask colloidal nanolithography
large-area chiral gold nanostructures
plasmonics
chirality
circular dichroism
dipole model
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