Article

Plasmonic nanorod metamaterials for biosensing.

Laboratoire Lasers, Plasmas et Procédés Photoniques (LP3 UMR 6182 CNRS), Faculté des Sciences de Luminy, Université de Méditerranée, 163 Avenue de Luminy, 13288 Marseille Cedex 09, France.
Nature Material (impact factor: 32.84). 10/2009; 8(11):867-71. DOI:10.1038/nmat2546 pp.867-71
Source: PubMed

ABSTRACT Label-free plasmonic biosensors rely either on surface plasmon polaritons or on localized surface plasmons on continuous or nanostructured noble-metal surfaces to detect molecular-binding events. Despite undisputed advantages, including spectral tunability, strong enhancement of the local electric field and much better adaptability to modern nanobiotechnology architectures, localized plasmons demonstrate orders of magnitude lower sensitivity compared with their guided counterparts. Here, we demonstrate an improvement in biosensing technology using a plasmonic metamaterial that is capable of supporting a guided mode in a porous nanorod layer. Benefiting from a substantial overlap between the probing field and the active biological substance incorporated between the nanorods and a strong plasmon-mediated energy confinement inside the layer, this metamaterial provides an enhanced sensitivity to refractive-index variations of the medium between the rods (more than 30,000 nm per refractive-index unit). We demonstrate the feasibility of our approach using a standard streptavidin-biotin affinity model and record considerable improvement in the detection limit of small analytes compared with conventional label-free plasmonic devices.

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Keywords

active biological substance
 
biosensing technology
 
conventional label-free plasmonic devices
 
feasibility
 
guided mode
 
local electric field
 
localized plasmons
 
localized surface plasmons
 
modern nanobiotechnology architectures
 
nanorods
 
porous nanorod layer
 
probing field
 
record considerable improvement
 
refractive-index unit
 
small analytes
 
standard streptavidin-biotin affinity model
 
strong enhancement
 
strong plasmon-mediated energy confinement
 
substantial overlap
 
undisputed advantages
 

A V Kabashin