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Gold Nanohelices for Chiral Plasmonic Films by Templated Electroless Plating

Chiral plasmonic films with gold nanohelices in polymer matrix are fabricated by templated electroless plating using self‐assembled enantiomeric polylactide‐based block copolymers (BCPs) as templates. By taking advantage of the helicity control of forming helical phase from the self‐assembly of chiral BCPs, mirror‐image signals from Cotton effect in electronic circular dichroism spectra can be clearly identified. The polymeric films with gold nanohelices show chiral plasmonic properties, as further evidenced by simulation from finite‐difference time‐domain method. This study may shed the light on fabrication of chiral plasmonic materials with adaptability in the applications for optical devices.