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K: Fachverband Kurzzeitphysik

K 7: Poster

K 7.4: Poster

Mittwoch, 19. März 2014, 16:30–18:30, SPA Foyer

Characterization of the complex refractive index of metals by high harmonic XUV radiation — •Christian Halter, Dirk Hemmers, and Georg Pretzler — Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf

Two methods to characterize the complex refractive index of thin metal foils are presented. The first method is based on the comparison of the intensities of two high harmonic XUV spectra. The XUV beam passes a gold grating and one of the two first orders is transmitted through a metal foil and thus harmonics are attenuated depending on their wavelength. The comparison to the second first order spectrum allows the calculation of the real part of the complex refractive index.

The second method uses a double pinhole setup. The interference pattern is changed by the introduction of an optical path difference via inserting a metal foil in one of the two optical paths which interfere. This reveals the imaginary part of the complex refractive index.