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Colloidal-based random lasers (RLs) are highly efficient and have been exploited in a wide range of geometries. However, in the particular case of ethanol solutions of rhodamines and particles, the RL behavior is quite unstable due to the fast precipitation of the particles. In this Letter, specially designed amorphous particles were synthesized by a sol-gel method, preventing the degradation of the RL for long operating lifetimes of over shots. As a consequence, this modified colloidal RL allowed the observation of a clear replica-symmetry-breaking phase transition from the paramagnetic fluorescent to spin-glass RL behavior, which has not been observed in the system with nonfunctionalized particles.
© 2016 Optical Society of America
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