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 Karl Franzens University Graz

Graz University of Technology 

Taming waves in theory and experiment
Univ.-Prof. Dr. Stefan Rotter
Vienna University of Technology, Institute for Theoretical Physics
17:00 - 18:00 Tuesday 18 June 2013 KFU HS 5.01

I will speak about recent advances in shaping and controlling waves in cavities and random media [1]. In particular, I will show how the experimentally accessible information stored in a system's scattering matrix can be used to create highly collimated wave beams which traverse this system without being diffracted [2,3]. The key tool to realize such particle-like scattering states is the socalled time-delay operator which can be implemented with electromagnetic as well as with acoustic waves. In the second part of my talk I will explain how a suitably designed disorder can be used to control the coherent transmission through waveguides [4] as well as the emission properties of a so-called random laser [5].
[1] Mosk, Lagendijk, Lerosey, Fink, Nature Phot. 6, 283, (2012).
[2] Rotter, Ambichl, Libisch, PRL 106, 120602 (2011) .
[3] Appell, Phys. Rev. Focus 27, 13 (2011).
[4] Dietz et al., PRB 86, 201106(R) (2012)
[5] Hisch et al. (in preparation)