All-Optical Control of the Polarization Axis of Polariton Condensates

Le résumé fourni par la source

Exciton-polariton condensates in optical metasurfaces offer the potential for all-optical information processing through polariton-polariton interactions and their polarization degrees of freedom. We demonstrate all-optical control of the polarization state of a polariton condensate, enabled by tailoring the spatial geometry of the optical excitation. These condensates are formed in a bound state in the continuum (BIC) supporting a polarization vortex in momentum space, which translates the spatial distribution of the pump into a well-defined polarization of the condensate. Our experimental results show that elliptically shaped pump spots generate condensates with orthogonal polarization states to the orientation of the long axis of the pump. The observations are supported by Gross-Pitaevskii simulations that show the analogy of condensation in the polarization vortex of the BIC with the optical spin-orbit coupling in planar microcavities. This all-optical method to manipulate polarization states offers a new degree of freedom for encoding information and paves the way toward the development of spin-controlled polariton interaction in polaritonic devices.

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