Regensburg 2010 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 47: [O] Plasmonics and Nanooptics VII (Joint Session DS/O/HL)

DS 47.4: Vortrag

Freitag, 26. März 2010, 12:00–12:15, H32

Negative refraction in natural ferromagnetic metals — •Sebastian Engelbrecht, Alexey Shuvaev, and Andrei Pimenov — Experimentelle Physik 4, Universität Würzburg

It is generally believed that nature does not provide materials which show negative refraction. Up to now, the experiments with negative refraction have been realized with metamaterials or photonic crystals. As has been suggested recently, negative refraction in natural materials can be realized in ferromagnetic metals. Close to the ferromagnetic resonance (FMR) the real part of the magnetic permeability can reach negative values. This may lead to negative refraction as long as the dielectric permittivity is dominated by metallic response. This talk will provide experimental data of ferromagnetic metals (Fe,Co) which indeed show a range of negative refraction close to FMR in millimeter frequency range. In these materials the negative refractive index can be achieved even at room temperature.