Fabrication and Characterization of Plasmonic Nanopores with Cavities in the Solid Support
Artikel i vetenskaplig tidskrift, 2017

Plasmonic nanostructures are widely used for various sensing applications by monitoring changes in refractive index through optical spectroscopy or as substrates for surface enhanced Raman spectroscopy. However, in most practical situations conventional surface plasmon resonance is preferred for biomolecular interaction analysis because of its high resolution in surface coverage and the simple single-material planar interface. Still, plasmonic nanostructures may find unique sensing applications, for instance when the nanoscale geometry itself is of interest. This calls for new methods to prepare nanoscale particles and cavities with controllable dimensions and curvature. In this work, we present two types of plasmonic nanopores where the solid support underneath a nanohole array has been etched, thereby creating cavities denoted as 'nanowells' or 'nanocaves' depending on the degree of anisotropy (dry or wet etch). The refractometric sensitivity is shown to be enhanced upon removing the solid support because of an increased probing volume and a shift of the asymmetric plasmonic field towards the liquid side of the finite gold film. Furthermore, the structures exhibit different spectral changes upon binding inside the cavities compared to the gold surface, which means that the structures can be used for location-specific detection. Other sensing applications are also suggested.

sensors

Metal-Films

nanostructures

nanopores

adsorption

Sensitivity

Sensors

plasmons

Colloidal Lithography

Spectroscopy

Nanohole Arrays

colloidal lithography

Författare

Bita Malekian

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Kunli Xiong

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Gustav Emilsson

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

J. Andersson

Insplorion

Cecilia Fager

Chalmers, Fysik, Eva Olsson Group

Eva Olsson

Chalmers, Fysik, Eva Olsson Group

Elin Maria Kristina Larsson

Insplorion

Andreas Dahlin

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Teknisk ytkemi

Sensors

1424-8220 (ISSN) 1424-3210 (eISSN)

Vol. 17 6 Article no. 1444 - 1444

Ämneskategorier

Nanoteknik

DOI

10.3390/s17061444