naa a22 4500 510816169 CHVBK 20180411083508.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11468-013-9549-3 doi (NATIONALLICENCE)springer-10.1007/s11468-013-9549-3 Tuning the Fano Resonance Between Localized and Propagating Surface Plasmon Resonances for Refractive Index Sensing Applications [Elektronische Daten] [Kristof Lodewijks, Jef Ryken, Willem Van Roy, Gustaaf Borghs, Liesbet Lagae, Pol Van Dorpe] Localized and propagating surface plasmon resonances are known to show very pronounced interactions if they are simultaneously excited in the same nanostructure. Here, we study the Fano interference that occurs between localized surface plasmon resonance (LSPR) and propagating surface plasmon polariton (SPP) modes by means of phase-sensitive spectroscopic ellipsometry. The sample structures consist of periodic gratings of gold nanodisks on top of a continuous gold layer and a thin dielectric spacer, in which the structural dimensions were tuned in such a way that the dipolar LSPR mode and the propagating SPP modes are excited in the same spectral region. We observe pronounced anti-crossing and strongly asymmetric line shapes when both modes move to each other's vicinity, accompanied of largely increased phase differences between the respective plasmon resonances. Moreover, we show that the anti-crossing can be exploited to increase the refractive index sensitivity of the localized modes dramatically, which result in largely increased values for the figure-of-merit which reaches values between 24 and 58 for the respective plasmon modes. Springer Science+Business Media New York, 2013 Localized surface plasmon resonance (LSPR) nationallicence Surface plasmon polariton (SPP) nationallicence Fano interference nationallicence Spectroscopic ellipsometry nationallicence Refractive index sensing nationallicence Lodewijks Kristof IMEC, Kapeldreef 75, 3001, Leuven, Belgium aut Ryken Jef IMEC, Kapeldreef 75, 3001, Leuven, Belgium aut Van Roy Willem IMEC, Kapeldreef 75, 3001, Leuven, Belgium aut Borghs Gustaaf IMEC, Kapeldreef 75, 3001, Leuven, Belgium aut Lagae Liesbet IMEC, Kapeldreef 75, 3001, Leuven, Belgium aut Van Dorpe Pol IMEC, Kapeldreef 75, 3001, Leuven, Belgium aut Plasmonics Springer US; http://www.springer-ny.com 8/3(2013-09-01), 1379-1385 1557-1955 8:3<1379 2013 8 11468 https://doi.org/10.1007/s11468-013-9549-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11468-013-9549-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lodewijks Kristof IMEC, Kapeldreef 75, 3001, Leuven, Belgium aut NATIONALLICENCE 700 1- Ryken Jef IMEC, Kapeldreef 75, 3001, Leuven, Belgium aut NATIONALLICENCE 700 1- Van Roy Willem IMEC, Kapeldreef 75, 3001, Leuven, Belgium aut NATIONALLICENCE 700 1- Borghs Gustaaf IMEC, Kapeldreef 75, 3001, Leuven, Belgium aut NATIONALLICENCE 700 1- Lagae Liesbet IMEC, Kapeldreef 75, 3001, Leuven, Belgium aut NATIONALLICENCE 700 1- Van Dorpe Pol IMEC, Kapeldreef 75, 3001, Leuven, Belgium aut NATIONALLICENCE 773 0- Plasmonics Springer US; http://www.springer-ny.com 8/3(2013-09-01), 1379-1385 1557-1955 8:3<1379 2013 8 11468 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer