title: High aspect ratio plasmonic nanostructures for sensing applications.
abstract: 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.
authors: Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, CH-5232 Villigen-PSI, Switzerland.
authors: Birgit
authors: B
authors: Päivänranta
authors: Hannes
authors: H
authors: Merbold
authors: Reto
authors: R
authors: Giannini
authors: Luca
authors: L
authors: Büchi
authors: Sergey
authors: S
authors: Gorelick
authors: Christian
authors: C
authors: David
authors: Jörg F
authors: JF
authors: Löffler
authors: Thomas
authors: T
authors: Feurer
authors: Yasin
authors: Y
authors: Ekinci
mesh_terms: D015374:Biosensing Techniques / Q000379:methods*; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry*; D013057:Spectrum Analysis