Abstract

As topological objects, vortices carry quantized orbital angular momentum (OAM), known as their topological charge. They have been intensively studied in many physical systems such as in nonlinear optics, atomic condensates, and polariton condensates. The quantized topological charge of a vortex represents clockwise or counter-clockwise rotation and can be regarded as binary information carrier, leading to application potential in information processing and data storage. Polariton vortices in semiconductor microcavities show intriguing properties and have attracted a lot of attention due to the light-matter hybrid nature of polaritons. For example, polariton vortices can be created non-resonantly by using optical beams, with the OAM forming spontaneously. The direction of the OAM is associated with the surrounding environment, which also allows for all-optical control of the vorticity. In this talk, several methods will be introduced to create and control polariton vortices in different potential structures. The shape and behavior of the vortices formed depend on the excitation manner. They can be either freely moving in space and always appear as vortex-antivortex pairs, or they can be spatially localized with ring shape. Both types will be reviewed in this talk.

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