We demonstrate theoretically and experimentally that a specifically designed microcavity driven in the optical parametric oscillation regime exhibits lighthouse-like emission, that is, an emission focused around a single direction. Remarkably, the emission direction of this microlighthouse is continuously controlled by the linear polarization of the incident laser, and angular beam steering over 360° is demonstrated. Theoretically, this effect arises from the interplay between the nonlinear optical response of microcavity exciton–polaritons, the difference in the subcavities forming the microcavity, and the rotational invariance of the device.

We demonstrate theoretically and experimentally that a specifically designed microcavity driven in the optical parametric oscillation regime exhibits lighthouse-like emission, i.e., an emission focused around a single direction. Remarkably, the emission direction of this micro-lighthouse is continuously controlled by the linear polarization

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