Regular Article – Nonlinear Dynamics
Nonlinear optical nonreciprocity in a surface plasmon–exciton coupled asymmetric cavity system
School of Physics, East China University of Science and Technology, 200237, Shanghai, China
2 School of Materials Science and Engineering, East China University of Science and Technology, 200237, Shanghai, China
3 Shanghai Frontiers Science Center of Optogenetic Techniques for Cell Metabolism, East China University of Science and Technology, 200237, Shanghai, China
Accepted: 28 October 2022
Published online: 7 November 2022
Optical nonreciprocity and nonreciprocal devices have attracted great research interest in recent years, due to their important applications in optical communication, information processing, etc. In this work, we investigate optical nonreciprocity in the quantum dot–metal nanoparticle (QD-MNP) hybrid system inside an asymmetric cavity. Due to the optical nonlinear effect, the input–output relationship of the cavity shows a bistable S-shaped curve, which can be employed to achieve optical nonreciprocity in the asymmetric cavity system. Nonlinear interaction between photons and QD excitons can be strengthened by using the surface plasmon effect in the QD-MNP nanostructures, providing the possibility of realizing better performance of optical nonreciprocity compared with the single QDs. Not only the light transmittance is enhanced in one direction while further suppressed in the reverse direction, but also the intensity threshold for generating optical nonreciprocity is also reduced in the hybrid surface plasmon–exciton cavity system. Our work may provide references for novel design and experimental realization of nonlinearity-based optical nonreciprocal devices.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2022. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.