Graz Advanced School of Science - Physics Colloquium of the University of Graz and the Graz University of Technology

Vortragender:

Univ.-Prof. Dr. Stefan Rotter

Institute for Theoretical Physics, Vienna University of Technology, Austria,

Abstract:

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)