A hybrid random laser using dye with self-organised GaN nanorods

Self-organized GaN nanorods with population densities ranging between 0.1 and 0.5 m- 2 and average heights in the range 1.7 to 16.5 µm, prepared by metal-organic chemical vapor deposition, were used as scattering centres for random lasing by incorporating Rhodamine 6G liquid dye solutions as the gain media. A lasing threshold as low as 11.3 J/cm2 was obtained from samples with nanorod density above 0.3 m-2. The threshold depended on the nanorod density and diameter, but not the nanorod height. Lasing emission was observed at multiple angles, a clear indication of random lasing.