What is it about?

The skyrmion (aka half-vortex) and spin vortex resonantly imprinted on a 2D polariton fluid undergo a continuous transformation in time. The transformation consists in a rotation in the Poincaré sphere of polarization and it is ascribed to the xy anisotropy of the device plane. This effect leads to generalized vortex states, and even to a full-reversal of the initial topology, e.g., of a lemon-skyrmion into a star-skyrmion, or of a hedgehog (radial) polarization texture into an hyperbolic texture. The effect is analogue to a waveplate device, but instead than a fixed quantity rotation, it exerts a continouos Poincaré rotation on the ultrafast time scale of tens of picosecond.

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Why is it important?

The skyrmion is also known as half-vortex or full-Poincaré beam. This latter word is to indicate the presence of all the states of polarization in the space texture. The continouos twist of the full-Poincaré texture extends the polarization shaping concept to structured beams, and moves the field towards the concept of full-polarization textures in both space and time.

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This page is a summary of: Twist of generalized skyrmions and spin vortices in a polariton superfluid, Proceedings of the National Academy of Sciences, December 2016, Proceedings of the National Academy of Sciences,
DOI: 10.1073/pnas.1610123114.
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