Polarization conversion-based molecular sensing using anisotropic plasmonic metasurfaces
Journal article, 2016
Anisotropic media induce changes in the polarization state of transmitted and reflected light. Here we combine this effect with the refractive index sensitivity typical of plasmonic nanoparticles to experimentally demonstrate self-referenced single wavelength refractometric sensing based on polarization conversion. We fabricated anisotropic plasmonic metasurfaces composed of gold dimers and, as a proof of principle, measured the changes in the rotation of light polarization induced by biomolecular adsorption with a surface sensitivity of 0.2 ng cm(-2). We demonstrate the possibility of miniaturized sensing and we show that experimental results can be reproduced by analytical theory. Various ways to increase the sensitivity and applicability of the sensing scheme are discussed.
Author
Ruggero Verre
Chalmers, Physics, Bionanophotonics
N. Maccaferri
CIC NanoGUNE
Chalmers University of Technology
K. Fleischer
Trinity College Dublin
Mikael Svedendahl
Chalmers, Physics, Bionanophotonics
Nils Odebo Länk
Chalmers, Physics, Bionanophotonics
Alexander Dmitriev
Chalmers, Physics, Bionanophotonics
Paolo Vavassori
Ikerbasque, the Basque Foundation for Science
CIC NanoGUNE
I. V. Shvets
Trinity College Dublin
Mikael Käll
Chalmers, Physics, Bionanophotonics
Nanoscale
2040-3364 (ISSN)
Vol. 8 20 10576-10581Subject Categories (SSIF 2011)
Atom and Molecular Physics and Optics
DOI
10.1039/c6nr01336h