Ultrasensitive and label-free molecular-level detection enabled by light phase control in magnetoplasmonic nanoantennas. Maccaferri, N.; E. Gregorczyk, K.; de Oliveira, T. V. A. G.; Kataja, M.; van Dijken, S.; Pirzadeh, Z.; Dmitriev, A.; Åkerman, J.; Knez, M.; and Vavassori, P. Nature Communications, 6:6150, February, 2015.
Ultrasensitive and label-free molecular-level detection enabled by light phase control in magnetoplasmonic nanoantennas [link]Paper  doi  abstract   bibtex   
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 \textasciitilde0.8 ag per nanoantenna of polyamide-6.6 (n=1.51), which is representative for a large variety of polymers, peptides and proteins. View full text
@article{maccaferri_ultrasensitive_2015,
	title = {Ultrasensitive and label-free molecular-level detection enabled by light phase control in magnetoplasmonic nanoantennas},
	volume = {6},
	copyright = {© 2015 Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.},
	url = {http://www.nature.com/ncomms/2015/150202/ncomms7150/abs/ncomms7150.html},
	doi = {10.1038/ncomms7150},
	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 {\textasciitilde}0.8 ag per nanoantenna of polyamide-6.6 (n=1.51), which is representative for a large variety of polymers, peptides and proteins.
View full text},
	language = {en},
	urldate = {2016-01-06TZ},
	journal = {Nature Communications},
	author = {Maccaferri, Nicolò and E. Gregorczyk, Keith and de Oliveira, Thales V. A. G. and Kataja, Mikko and van Dijken, Sebastiaan and Pirzadeh, Zhaleh and Dmitriev, Alexandre and Åkerman, Johan and Knez, Mato and Vavassori, Paolo},
	month = feb,
	year = {2015},
	keywords = {Analytical chemistry, Applied physics, Physical sciences, nanotechnology},
	pages = {6150}
}
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