Open AccessMulti-diffractive grating for surface plasmon biosensors with direct back-side excitation
Author(s) -
Simone Hageneder,
Stefan Fossati,
Nicolas-Guillermo Ferrer,
Batuhan Güngörmez,
Simone K. Auer,
Jakub Dostálek
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.410416
Subject(s) - materials science , surface plasmon , optics , plasmon , surface plasmon resonance , nanoimprint lithography , refractive index , grating , surface plasmon polariton , diffraction grating , excitation , prism , localized surface plasmon , optoelectronics , nanophotonics , biosensor , total internal reflection , lithography , extraordinary optical transmission , diffraction , nanotechnology , physics , nanoparticle , fabrication , medicine , alternative medicine , pathology , quantum mechanics
A multi-diffractive nanostructure is reported for the resonant excitation of surface plasmons that are cross-coupled through a thin metallic film. It consists of two superimposed periodic corrugations that allow diffraction excitation of surface plasmons on the inner side of a thin metal film and their subsequent phase matching with counterpropagating surface plasmons travelling to the opposite direction on its other side. This interaction leads to establishing of a set of cross-coupled Bragg-scattered surface plasmon modes that exhibit an electromagnetic field localized on both metal film interfaces. The reported structure is attractive for surface plasmon resonance biosensor applications, where direct optical probing can be done through the substrate without the need of optical matching to a high refractive index prism. In addition, it can be prepared by mass production - compatible means with UV-nanoimprint lithography and its biosensing performance characteristics are demonstrated by refractometric and biomolecular affinity binding studies.