Discrete chiral ballistic polariton laser
arXiv:2502.02816 · doi:10.1002/lpor.202500195
Abstract
Orbital angular momentum (OAM) of light appears when the phase of an electromagnetic wavefront winds around its direction of propagation, also known as optical vorticity. Contrary to the binary-valued photon spin, the integer-valued optical vortex charge is unbounded with many advantages in optical communication and trapping and enhancing the capacity of data encoding and multiplexing. Singular optoelectronic and chiroptic quantum technologies rely on the development of coherent and compact light sources of well-defined and reconfigurable OAM. We propose an optically tunable discrete chiral exciton-polariton microlaser that leverages strong spin-dependent polariton interactions, structured pumping, and inherent cavity photon spin-to-angular momentum conversion to emit coherent nonlinear light of variable OAM. By choosing pumping patterns with broken inversion symmetry in the microcavity plane we invoke geometric frustration between spinor ballistic condensates which spontaneously obtain a high-charge circulating current locked with the pump polarization. Our optically configurable system requires only a planar cavity thus avoiding the need for specialized irreversible cavity patterning or metasurfaces.
arXiv commentAAM version
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