Issue |
J. Eur. Opt. Society-Rapid Publ.
Volume 18, Number 1, 2022
EOSAM 2021
|
|
---|---|---|
Article Number | 6 | |
Number of page(s) | 7 | |
DOI | https://doi.org/10.1051/jeos/2022006 | |
Published online | 22 August 2022 |
Research Article
Coherence onset in PT-symmetric organic microcavities: towards directional propagation of light
1
Dresden Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden, 01062 Dresden, Germany
2
Institute for Theoretical Physics, University of Amsterdam, PO Box 94485, 1090 GL Amsterdam, The Netherlands
3
Institute for Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany
* Corresponding author: karla.roszeitis@tu-dresden.de
Received:
20
January
2022
Accepted:
22
July
2022
For the investigation of non-Hermitian effects and physics under parity-time (PT) symmetry, photonic systems are ideal model systems for both experimental and theoretical research. We investigate a fundamental building block of a potential photonic device, consisting of coupled organic microcavities. The coupled system contains cavities with gain and loss and respects parity-time symmetry, leading to non-Hermitian terms in the corresponding Hamiltonian. Experimentally, two coupled cavities are realized and driven optically using pulsed laser excitation up to the lasing regime. We show that above the lasing threshold, when coherence evolves, the coupled-cavity system starts to operate asymmetrically, generating more light on one side of the device, being characteristic of non-Hermitian PT-symmetric systems. Calculations and simulations on a Su–Schrieffer–Heeger (SSH) chain composed of these PT-symmetric unit cells show the emergence of non-trivial topological features.
Key words: Coupled organic microcavities / Parity-time symmetric system / Non-Hermitian physics
© The Author(s), published by EDP Sciences, 2022
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