极化子凝聚体中的定向平面天线
Directional planar antennae in polariton condensates
AI总结：
本文提出利用空间光调制器将非共振泵浦光束整形为平凹透镜形状，在半导体微腔中实现激子-极化子凝聚体的全光平面微透镜，当泵浦高于凝聚阈值时系统成为定向极化子天线，产生强烈相干极化子聚焦光束，并研究了泵浦强度与透镜几何形状对天线性能的优化作用。
摘要：
我们报道了在半导体微腔中实现激子-极化子凝聚体的全光平面微透镜。我们利用空间光调制器将非共振泵浦光束整形为平凹透镜形状，聚焦在微腔平面上。当泵浦强度高于凝聚阈值时，该系统有效地成为定向极化子天线，在远离泵浦区域处产生一束强烈的相干极化子聚焦光束。我们研究了泵浦强度的影响，该强度调节极化子的增益和损耗之间的相互作用，并探索了透镜形泵浦几何形状以优化定向极化子天线电路的可行性。
英文摘要：
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.
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