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O: Fachverband Oberflächenphysik

O 31: Nano-optics of metallic and semiconducting nanostructures (theory)

O 31.8: Vortrag

Mittwoch, 25. März 2009, 12:15–12:30, SCH A216

Investigation of the dispersion relation of nanometer meander structures — •Heinz Schweizer, Liwei Fu, Thomas Weiss, and Harald Giessen — Universität Stuttgart, 4.Phys.Inst., Pfaffenwaldring 57

On the basis of a Fourier modal method we analyze the dispersion relation of nanometer meander structures. Meander structures are of special interest for designing metamaterials with respect to efficient coupling of the magnetic field into the meander loop at all angles of incidence [1] and for designing plasmonic lasers [2]. To understand in detail the behaviour of the meander structures we analyzed the dispersion relation of propagating electromagnetic fields with respect to the transversal component of the propagation vector. Varied coupling strength between the long range and short range plasmonic modes are observed. By tuning the local meander geometry and parameters such as width, depth, and metal layer thickness we are able to engineer the bandgap of the dispersion relation in a large range and in a simple way, which provides a large application potential for plasmonic lasers [2] and other plasmonic devices.

[1] H. Schweizer et al., phys. stat. sol. (a) 204, 3886 (2007). [2] T. Okamoto et al, Phys. Rev. B77, 115425 (2008).