Reversing the pump dependence of a laser at an exceptional point

M. Brandstetter, M. Liertzer, C. Deutsch, P. Klang, J. Schöberl, H. E. Türeci, G. Strasser, K. Unterrainer and S. Rotter ()
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M. Brandstetter: Photonics Institute, Vienna University of Technology
M. Liertzer: Institute for Theoretical Physics, Vienna University of Technology
C. Deutsch: Photonics Institute, Vienna University of Technology
P. Klang: Center for Micro- and Nanostructures, Vienna University of Technology
J. Schöberl: Institute for Analysis and Scientific Computing, Vienna University of Technology
H. E. Türeci: Princeton University, Princeton
G. Strasser: Center for Micro- and Nanostructures, Vienna University of Technology
K. Unterrainer: Photonics Institute, Vienna University of Technology
S. Rotter: Institute for Theoretical Physics, Vienna University of Technology

Nature Communications, 2014, vol. 5, issue 1, 1-7

Abstract: Abstract When two resonant modes in a system with gain or loss coalesce in both their resonance position and their width, a so-called exceptional point occurs, which acts as a source of non-trivial physics in a diverse range of systems. Lasers provide a natural setting to study such non-Hermitian degeneracies, as they feature resonant modes and a gain material as their basic constituents. Here we show that exceptional points can be conveniently induced in a photonic molecule laser by a suitable variation of the applied pump. Using a pair of coupled microdisk quantum cascade lasers, we demonstrate that in the vicinity of these exceptional points the coupled laser shows a characteristic reversal of its pump dependence, including a strongly decreasing intensity of the emitted laser light for increasing pump power.

Date: 2014
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DOI: 10.1038/ncomms5034

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