Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 50: Coupled Nanostructures and Light Localization
O 50.4: Vortrag
Mittwoch, 18. März 2015, 11:15–11:30, MA 043
Mode normalization and mode sensitivity in metallic photonic crystal slabs and complex plasmonic nanostructures — •Thomas Weiss1, Martin Mesch1, Harald Giessen1, Wolfgang Langbein2, and Egor A. Muljarov2 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany — 2School of Physics and Astronomy, Cardiff University, United Kingdom
The optical properties of a given structure are strongly determined by its resonances. Of significant importance are plasmonic resonances, which occur in metallo-dielectric systems. Problems arise whenever it becomes necessary to properly normalize the optical resonances, because optically active resonances couple to the far-field, so that a straight-forward integral over the whole space will diverge. In 2010, Muljarov et al. have developed an analytical mode normalization [1], which allows not only to expand the Green’s function in terms of resonant states, but also to derive the modification of the optical response due to changes in the occurring material distributions via the so-called resonant state expansion. We will present how to adapt the analytical normalization to periodic structures such as metallic photonic crystal slabs, for which we have developed efficient procedures for finding the optical modes [2]. Moreover, we will show how we can use first order perturbation theory in order to derive the sensitivity of plasmonic resonances with respect to refractive index changes, which provides new routes to develop advanced sensing devices.
[1] E. A. Muljarov et al., Europhys. Lett. 92, 50010 (2010).
[2] T. Weiss et al., J. Opt. Soc. Am. A 28, 238-244 (2011).