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Complex assemblies of light-emitting polymer nanofibers with molecularmaterials exhibiting optical gain can lead to important advance to amorphousphotonics and to random laser science and devices. In disordered mats ofnanofibers, multiple scattering and waveguiding might interplay to determinelocalization or spreading of optical modes as well as correlation effects. Herewe study electrospun fibers embedding a lasing fluorene-carbazole-fluorenemolecule and doped with titania nanoparticles, which exhibit random lasing withsub-nm spectral width and threshold of about 9 mJ cm^-2 for the absorbedexcitation fluence. We focus on the spatial and spectral behavior of opticalmodes in the disordered and non-woven networks, finding evidence for thepresence of modes with very large spatial extent, up to the 100micrometer-scale. These findings suggest emission coupling into integratednanofiber transmission channels as effective mechanism for enhancing spectralselectivity in random lasers and correlations of light modes in the complex anddisordered material.

Nanoparticle-doped electrospun fiber random lasers with spatially extended light modes