  Non-linearities in organic exciton-polariton microcavities represent an
attractive platform for second-generation quantum devices. However, progress in
this area hinges on the development of material platforms for high-performance
polariton lasing, scalable and sustainable fabrication, and ultimately
strategies for electrical pumping. Here, we show how introducing Schlieren
textures in a liquid crystalline conjugated polymer and the associated
microdomains of distinct chain orientation enable in-plane Anderson
localization of polaritons. In high-Q distributed Bragg reflector
microcavities, this strong localization facilitated polariton lasing at
unprecedented thresholds of 136 fJ per pulse, thus providing a pathway to the
study of fundamental effects at low polariton numbers. Anderson localization
further permitted polariton lasing in more lossy metallic microcavities while
maintaining a competitive lasing threshold. The facile fabrication of these
cavities will drastically reduce the complexity of integrating polariton laser
with other structures and the high conductivity of metallic mirrors provides a
route to electrical pumping.
