High aspect ratio plasmonic nanostructures for sensing applications

Birgit Päivänranta, Hannes Merbold, Reto Giannini, Luca Büchi, Sergey Gorelick, Christian David, Jörg F. Löffler, Thomas Feurer, Yasin Ekinci

Research output: Contribution to journalArticleResearchpeer-review

62 Citations (Scopus)


We present an experimental and theoretical study of plasmonic modes in high aspect ratio nanostructures in the visible wavelength region and demonstrate their high performance for sensing applications. Ordered and well-defined plasmonic structures with various cross-sectional profiles and heights are obtained using a top-down fabrication process. We show that, compared to cylindrical nanorods, structures with split-ring resonator-like cross sections have great potential for powerful sensing due to a pronounced polarization dependence, strong field enhancement, structural tunability, and improved mechanical stability. The plasmonic structures under study exhibit high sensitivities, up to nearly 600 nm/RIU, and figures of merit above 20.

Original languageEnglish
Pages (from-to)6374-6382
Number of pages9
JournalACS Nano
Issue number8
Publication statusPublished - 23 Aug 2011
Externally publishedYes


  • biosensing
  • high aspect ratio
  • nanofabrication
  • plasmonics
  • split-ring resonators

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