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Core-Shell Plasmonic Nanohelices.

Dolfine Kosters1,2, Anouk de Hoogh2, Hans Zeijlemaker2

  • 1Kavli Institute of Nanoscience, Department for Quantum Nanoscience, Lorentzweg 1, 2628 CJ Delft, The Netherlands.

ACS Photonics
|August 22, 2017
PubMed
Summary
This summary is machine-generated.

We developed tunable core-shell plasmonic nanohelices with distinct responses to circularly polarized light. These chiral nanostructures exhibit a record dissymmetry factor, paving the way for advanced nanophotonic applications like biosensing.

Keywords:
chiralitycore−shellelectron beam induced depositionnanohelicesplasmonics

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Area of Science:

  • Nanophotonics
  • Chiral Metamaterials
  • Plasmonics

Background:

  • Plasmonic nanohelices are crucial for manipulating light at the nanoscale.
  • Chiral metamaterials offer unique optical properties but often lack tunability.
  • Existing nanohelices have limitations in their differential response to polarized light.

Purpose of the Study:

  • To introduce and characterize novel core-shell plasmonic nanohelices.
  • To investigate their chiral optical properties and tunability.
  • To explore their potential for sensing applications.

Main Methods:

  • Fabrication of glass core using electron beam induced deposition.
  • Sputter coating with a pure gold shell to create core-shell structures.
  • Optical measurements and numerical simulations to analyze chiral responses.

Main Results:

  • Demonstrated a dissymmetry factor of 0.86, significantly higher than previous reports.
  • Showcased extreme tunability of optical responses with nanometer-scale geometric changes.
  • Observed distinct responses to left and right circularly polarized light in the visible spectrum.

Conclusions:

  • Core-shell plasmonic nanohelices offer a highly tunable platform for chiral light-matter interactions.
  • The achieved high dissymmetry factor enhances their potential for sensitive detection.
  • These structures represent a powerful tool for nanophotonic applications, including biosensing.