Dresden 2011 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Plasmonics and Nanophotonics HL-I (jointly with HL and O)

DS 36.4: Vortrag

Mittwoch, 16. März 2011, 11:00–11:15, POT 251

Coupling model for the derivation of optical resonances in stacked nanogratings — •Thomas Weiss^1,2, Nikolay A. Gippius^2,3, Sergei G. Tikhodeev³, Gérard Granet², Liwei Fu¹, Richard Taubert¹, and Harald Giessen¹ — ¹4th Physics Institute and Research Center Scope, University of Stuttgart, Stuttgart, Germany — ²LASEMA, University Blaise Pascal, Aubière, France — ³A. M. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, Russia

Nanogratings have become one of the most important structures in modern nanooptics over the last few years. They can be used in different fields such as photonic crystals and metamaterials. However, the experimental fabrication as well as the corresponding numerical calculation is usually very time-consuming. Hence, simple models are required for a qualitative derivation of the optical behavior of such structures. Here, we present a method to approximate the optical resonances of stacked nanogratings using the Fourier modal method and optical scattering matrix theory. The resulting equations form a low-dimensional linear eigenvalue problem that can easily be solved for varying grating distances, including near field effects as well as multiple scattering in the far field regime with strong coupling to Fabry-Perot resonances. The method is not only accurate and fast; it provides also additional physical insight, as the individual components of the coupling mechanism can be studied independently. Furthermore, the model involves no fitting parameters. All quantities can be derived ab initio by the scattering matrix formalism.