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Organic exciton-photon polariton lasers have recently been shown to beremarkable candidates for the realization of efficient sources of coherentlight operating at room temperature. While their thresholds are now comparablewith conventional organic photon lasers, tuning of molecular conformation andorientation as a means to further enhance their performance remains largelyunexplored. Here, we first report a two-fold reduction in the threshold of apolariton laser based on a high-Q microcavity filled with an active layer ofpoly(9,9-dioctylfluorene) (PFO) when 15% {\beta}-phase conformation isintroduced. We then take advantage of the liquid crystalline properties of PFOand use a thin transparent sulfuric dye 1 (SD1) photoalignment layer to inducehomogeneous nematic alignment of the polymer chains. The resulting transitiondipole moment orientation increases the Rabi energy, bringing the system intothe ultra-strong coupling regime where we observe anisotropic polariton lasingwith an eight-fold reduction in absorbed threshold, down to 1.14 pJ / 0.36{\mu}Jcm-2 for the direction parallel to the orientation, with no emissionalong the orthogonal direction. To our knowledge, this threshold is lower thandemonstrated with state-of-the art optically pumped organic vertical cavitysurface-emitting photon and polariton lasers. This demonstration opens newopportunities for more efficient polaritonic devices and the observation offundamental effects at low polariton numbers.

Efficient anisotropic polariton lasing using molecular conformation and orientation in organic microcavities