Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms7150
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Funding
- Basque Government [PI2012-47, PI2013-56]
- Spanish Ministry of Economy and Competitiveness [MAT2012-36844, MAT2012-38161]
- Doctoral Programme of the Department of Education, Linguistic Policy and Culture of the Basque Government [PRE_2013_1_975]
- European Research Council [257654]
- Swedish Research Council (VR)
- Swedish Foundation for Strategic Research, SSF [RMA08]
- National Doctoral Programme in Nanoscience
- Academy of Finland [263510]
- European Research Council (ERC) [257654] Funding Source: European Research Council (ERC)
- Academy of Finland (AKA) [263510, 263510] Funding Source: Academy of Finland (AKA)
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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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