Special Solid State & Optics Seminar Series
sponsored by “The Flint Fund Series on Quantum Devices and Nanostructures”
Thursday March 7, 2019
Mann Engineer Student Center - Room 107
(located in Dunham Lab – 10 Hillhouse Ave)
Institute for Theoretical Physics, Vienna
University of Technology (TU Wien), Vienna, Austria
Introducing the random anti-laser: coherent perfect absorption in disordered media
Abstract: In my talk I will present the concept of random anti-lasing, i.e., the time-reverse of random lasing. In the same way as a random laser emits a spatially complex but coherent wave at its first lasing threshold, the random anti-laser absorbs such a complex incoming field perfectly. We recently implemented this concept in a microwave experiment, where an absorber is embedded in the middle of a disordered medium . Measuring the 8x8 scattering matrix of this structure allows us to calculate and then generate an incoming wave field that gets absorbed by more then 99.7 % inside the disorder. Our setup is scalable in the number of involved modes and can easily be transferred to other wave scattering systems. I will conclude with an outlook on the possible applications of this novel technology.
 K. Pichler, M. Kühmayer, J. Böhm, A. Brandstötter, P. Ambichl, U. Kuhl, and S. Rotter, Nature (in print).
Prof. Hui Cao