Heterogeneous Random Laser with Switching Activity Visualized by Replica Symmetry Breaking Maps

In the past decade, complex networks of light emitters are proposed asnovel platforms for photonic circuits and lab-on-chip active devices. Lasing networksmade by connected multiple gain components and graphs of nanoscale random lasers(RLs) obtained from complex meshes of polymeric nanofibers are successfulprototypes. However, in the reported research, mainly collective emission from awhole network of resonators is investigated, and only in a few cases, the emission fromsingle points showing, although homogeneous and broad, spatial emission. In all cases,simultaneous activation of the miniaturized lasers are observed. Here, differently, werealize heterogeneous random lasers made of ribbon-like and highly porous fibers with evident RL action from separated micrometric domains that alternatively switch on and off by tuning the pumping light intensity. We visualize this novel effect by building for the first time replica symmetry breaking (RSB) maps of the emitting fibers with 2 ?m spatial resolution. In addition, we calculate the spatial correlations of the laser regions showing clearly an average extension of 50 ?m. The observed blinking effect is due to mode interaction along light guiding fibers and opens new avenues in the fabrication of flexible photonic networks with specific and adaptable activity.