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We demonstrate theoretically and experimentally that a specifically designedmicrocavity driven in the optical parametric oscillation regime exhibitslighthouse-like emission, i.e., an emission focused around a single direction.Remarkably, the emission direction of this micro-lighthouse is continuouslycontrolled by the linear polarization of the incident laser, and angular beamsteering over \unit{360}{\degree} is demonstrated. Theoretically, thisunprecedented effect arises from the interplay between the nonlinear opticalresponse of microcavity exciton-polaritons, the difference in the subcavitiesforming the microcavity, and the rotational invariance of the device.

All-optical beam steering using the polariton lighthouse effect