  We report on the realization of all-optical planar microlensing for
exciton-polariton condensates in semiconductor microcavities. We utilize
spatial light modulators to structure a nonresonant pumping beam into a
planoconcave lens-shape focused onto the microcavity plane. When pumped above
condensation threshold, the system effectively becomes a directional polariton
antenna, generating an intense focused beam of coherent polaritons away from
the pump region. The effects of pump intensity, which regulates the interplay
between gain and blueshift of polaritons, as well as the geometry of
lens-shaped pump are studied and a strategy to optimize the focusing of the
condensate is proposed. Our work underpins the feasibility to guide nonlinear
light in microcavities using nonresonant excitation schemes, offering
perspectives on optically reprogrammable on-chip polariton circuitry.
