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Symmetry 2018, 10(6), 195;

Vortex Creation without Stirring in Coupled Ring Resonators with Gain and Loss

Faculty of Physics, University of Warsaw, ul. Pasteura 5, PL-02-093 Warszawa, Poland
Advanced Institute for Science and Technology, Hanoi University of Science and Technology, 100803 Hanoi, Vietnam
Department of Physics, Freie Universität Berlin, Arnimalle 14, D-14195 Berlin, Germany
International Academy of Optoelectronics at Zhaoqing, South China Normal University, 526238 Guangdong, China
Department of Physics, Boston College, Chestnut Hill, MA 02467, USA
Centro de Física Teórica e Computacional and Departamento de Física, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, Edifício C8, 1749-016 Lisboa, Portugal
Author to whom correspondence should be addressed.
Received: 30 April 2018 / Revised: 18 May 2018 / Accepted: 28 May 2018 / Published: 1 June 2018
(This article belongs to the Special Issue Broken Symmetry)
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We present the study of the dynamics of a two-ring waveguide structure with space-dependent coupling, linear gain and nonlinear absorption; the system that can be implemented in polariton condensates, optical waveguides and nanocavities. We show that by turning on and off local coupling between rings, one can selectively generate a permanent vortex in one of the rings. We find that due to the modulation instability, it is also possible to observe several complex nonlinear phenomena, including spontaneous symmetry breaking, stable inhomogeneous states with an interesting structure of currents flowing between rings, the generation of stable symmetric and asymmetric circular flows with various vorticities, etc. The latter can be created in pairs (for relatively narrow coupling length) or as a single vortex in one of the channels, which later alternates between channels. View Full-Text
Keywords: coupled microrings; nonlinear Schrödinger equation; nonlinear modes; vortices; stability coupled microrings; nonlinear Schrödinger equation; nonlinear modes; vortices; stability

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Ramaniuk, A.; Hung, N.V.; Giersig, M.; Kempa, K.; Konotop, V.V.; Trippenbach, M. Vortex Creation without Stirring in Coupled Ring Resonators with Gain and Loss. Symmetry 2018, 10, 195.

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