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 ~ 0.8 ag per nanoantenna of polyamide-6.6 (n=1.51), which is representative for a large variety of polymers, peptides and proteins.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Maccaferri N,Gregorczyk KE,de Oliveira TV,Kataja M,van Dijken S,Pirzadeh Z,Dmitriev A,Åkerman J,Knez M,Vavassori Pdoi
10.1038/ncomms7150subject
Has Abstractpub_date
2015-02-02 00:00:00pages
6150issn
2041-1723pii
ncomms7150journal_volume
6pub_type
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