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In the past decade, complex networks of light emitters are proposed as novelplatforms for photonic circuits and lab-on-chip active devices. Lasing networksmade by connected multiple gain components and graphs of nanoscale randomlasers (RLs) obtained from complex meshes of polymeric nanofibers aresuccessful prototypes. However, in the reported research, mainly collectiveemission from a whole network of resonators is investigated, and only in a fewcases, the emission from single points showing, although homogeneous and broad,spatial emission. In all cases, simultaneous activation of the miniaturizedlasers is observed. Here, differently, we realize heterogeneous random lasersmade of ribbon-like and highly porous fibers with evident RL action fromseparated micrometric domains that alternatively switch on and off by tuningthe pumping light intensity. We visualize this novel effect by building for thefirst time replica symmetry breaking (RSB) maps of the emitting fibers with 2{\mu}m spatial resolution. In addition, we calculate the spatial correlationsof the laser regions showing clearly an average extension of 50 {\mu}m. Theobserved blinking effect is due to mode interaction along light guiding fibersand opens new avenues in the fabrication of flexible photonic networks withspecific and adaptable activity.

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