Core-Shell Plasmonic Nanohelices

Dolfine Kosters, Anouk De Hoogh, Hans Zeijlemaker, Hakkl Acar, Nir Rotenberg, L. Kuipers

Research output: Contribution to journalArticleScientificpeer-review

24 Citations (Scopus)
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Abstract

We introduce core-shell plasmonic nanohelices, highly tunable structures that have a different response in the visible for circularly polarized light of opposite handedness. The glass core of the helices is fabricated using electron beam induced deposition and the pure gold shell is subsequently sputter coated. Optical measurements allow us to explore the chiral nature of the nanohelices, where differences in the response to circularly polarized light of opposite handedness result in a dissymmetry factor of 0.86, more than twice of what has been previously reported. Both experiments and subsequent numerical simulations demonstrate the extreme tunability of the core-shell structures, where nanometer changes to the geometry can lead to drastic changes of the optical responses. This tunability, combined with the large differential transmission, make core-shell plasmonic nanohelices a powerful nanophotonic tool for, for example, (bio)sensing applications.

Original languageEnglish
Pages (from-to)1858-1863
Number of pages6
JournalACS Photonics
Volume4
Issue number7
DOIs
Publication statusPublished - 19 Jul 2017

Keywords

  • chirality
  • core-shell
  • electron beam induced deposition
  • nanohelices
  • plasmonics

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  • Cite this

    Kosters, D., De Hoogh, A., Zeijlemaker, H., Acar, H., Rotenberg, N., & Kuipers, L. (2017). Core-Shell Plasmonic Nanohelices. ACS Photonics, 4(7), 1858-1863. https://doi.org/10.1021/acsphotonics.7b00496