Plasmon Line Shaping Using Nanocrosses for High Sensitivity Localized Surface Plasmon Resonance Sensing

The detection of small changes in the wavelength position of localized surface plasmon resonances in metal nanostructures has been used successfully in applications such as label-free detection of biomarkers. Practical implementations, however, often suffer from the large spectral width of the plasm...

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Bibliographic Details
Published in:Nano letters 2011-02, Vol.11 (2), p.391-397
Main Authors: Verellen, Niels, Van Dorpe, Pol, Huang, Chengjun, Lodewijks, Kristof, Vandenbosch, Guy A. E, Lagae, Liesbet, Moshchalkov, Victor V
Format: Article
Language:English
Subjects:
Collective excitations (including excitons, polarons, plasmons and other charge-density excitations)
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Crystallization - methods
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Equipment Design
Equipment Failure Analysis
Exact sciences and technology
Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties
Macromolecular Substances - chemistry
Materials Testing
Molecular Conformation
Nanostructures - chemistry
Nanostructures - ultrastructure
Nanotechnology - instrumentation
Particle Size
Physics
Surface and interface electron states
Surface Plasmon Resonance - instrumentation
Surface Properties
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:The detection of small changes in the wavelength position of localized surface plasmon resonances in metal nanostructures has been used successfully in applications such as label-free detection of biomarkers. Practical implementations, however, often suffer from the large spectral width of the plasmon resonances induced by large radiative damping in the metal nanocavities. By means of a tailored design and using a reproducible nanofabrication process, high quality planar gold plasmonic nanocavities are fabricated with strongly reduced radiative damping. Moreover, additional substrate etching results in a large enhancement of the sensing volume and a subsequent increase of the sensitivity. Coherent coupling of bright and dark plasmon modes in a nanocross and nanobar is used to generate high quality factor subradiant Fano resonances. Experimental sensitivities for these modes exceeding 1000 nm/RIU with a Figure of Merit reaching 5 are demonstrated in microfluidic ensemble spectroscopy.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl102991v