Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 41: Interaction with VUV and X-ray light II

A 41.5: Vortrag

Donnerstag, 20. März 2014, 15:15–15:30, BEBEL E42

Small group velocities at large frequencies — •Kilian P. Heeg¹, Ralf Röhlsberger², and Jörg Evers¹ — ¹Max-Planck-Institut für Kernphysik, Heidelberg, Germany — ²Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany

We study the properties of x rays reflected from a thin-film cavity with embedded Moessbauer nuclei [1, 2] in the time domain. For a suitably chosen nuclear target, the phase imprinted on the field results in sub- or superluminal propagation of the x-ray light. The group delay can be controlled with external parameters such as the tilting angle of the cavity and its magnetization. Our calculations predict that temporal shifts of the pulses of order of several 10 ns are possible. We further propose a setup to measure this group delay based on existing instrumentation, and discuss a possible experimental implementation at a synchrotron light source.

[1] R. Röhlsberger et al, Science 328, 1248–1251 (2010)

[2] K. P. Heeg et al, Phys. Rev. Lett. 111, 073601 (2013)