Abstract

In this paper, we introduce a random laser in which lasing action is observed at the edge of a dye-doped ${\mathrm{TiO}}_2$ thin film. A ${\mathrm{TiO}}_2$ nanotube membrane serves as a disordered structure that enhances the optical multiple scattering effect, while Rhodamine 6G dissolved in ethylene glycol is used as a gain medium. In the experiment, a random laser with a low threshold is observed when optically pumped at the fringe of a ${\mathrm{TiO}}_2$ nanotube membrane, which makes it practical for microfluidic integration. Simulation results show that multiple scattered light between the nanotubes and ethylene glycol solution is more likely to form a resonance loop with the help of a random edge structure. This well interrupted the appearance of coherent spikes in the emission laser spectrum in the experiment. The edge random laser offers simplicity and convenience in both fabrication and operation, which makes it a promising component for optofluidic laser integration with ${\mathrm{TiO}}_2$ functional material.

© 2016 Optical Society of America

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