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Ultrasensitive and label-free molecular-level detection enabled by light phase control in magnetoplasmonic nanoantennas

Journal article
Authors N. Maccaferri
K. E. Gregorczyk
Tvag de Oliveira
M. Kataja
S. van Dijken
Zhaleh Pirzadeh
Alexandre Dmitriev
Johan Åkerman
M. Knez
P. Vavassori
Published in Nature Communications
Volume 6
Pages artikel nr 6150
ISSN 2041-1723
Publication year 2015
Published at Department of Physics (GU)
Pages artikel nr 6150
Language en
Links dx.doi.org/10.1038/ncomms7150
https://gup.ub.gu.se/file/155182
Subject categories Physical Sciences

Abstract

Systems allowing label-free molecular detection are expected to have enormous impact on biochemical sciences. Research focuses on materials and technologies based on exploiting localized surface plasmon resonances in metallic nanostructures. The reason for this focused attention is their suitability for single-molecule sensing, arising from intrinsically nanoscopic sensing volume and the high sensitivity to the local environment. Here we propose an alternative route, which enables radically improved sensitivity compared with recently reported plasmon-based sensors. Such high sensitivity is achieved by exploiting the control of the phase of light in magnetoplasmonic nanoantennas. We demonstrate a manifold improvement of refractometric sensing figure-of-merit. Most remarkably, we show a raw surface sensitivity (that is, without applying fitting procedures) of two orders of magnitude higher than the current values reported for nanoplasmonic sensors. Such sensitivity corresponds to a mass of similar to 0.8 ag per nanoantenna of polyamide-6.6 (n = 1.51), which is representative for a large variety of polymers, peptides and proteins.

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