Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 58: Poster: Quantum Optics and Photonics IV
Q 58.41: Poster
Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof
Electromagnetic wave propagation in time-dependent Hermitian and non-Hermitian structures — •Armen Hayrapetyan1, Jörg Götte2, Sandra Klevansky3, Stephan Fritzsche4, Karen Grigoryan5, and Rubik Petrosyan5 — 1Max-Planck-Institut für Physik komplexer Systeme, Dresden, Germany — 2School of Physics and Astronomy, University of Glasgow, U.K. — 3Institut für Theoretische Physik, Universität Heidelberg, Germany — 4Helmholtz-Institut Jena, Germany — 5Yerevan State University, Armenia
We study the impact of a spatially homogeneous yet non-stationary dielectric permittivity on the dynamical and spectral properties of light. We focus on two distinct scenarios in which time-dependent dielectric structures experience either Hermitian or non-Hermitian change. In the Hermitian case, a smoothly time-varying modification of the medium is considered in order to demonstrate the possibility of amplification and attenuation of waves associated with the decrease and increase of the permittivity. In the non-Hermitian case, using a complex-valued permittivity with parity-time symmetry, modulations of light amplification and attenuation are shown correspondingly linked to the well-defined regions of gain and loss. While real-valued permittivities give rise to either the conversion or the time-dependent modulation of the frequency, the parity-time symmetric permittivity, beyond some threshold, leads to the splitting of extrema in the frequency modulation and to a reduction of the modulation period. Our results may pave the way towards controllable light-matter interaction in time-varying structures.