Planar waveguide nanolaser configured by dye-doped hybrid nanofilm on substrate

Abstract: Dye-doped hybrid silicate/titanium nanofilms on the glass substrate in the structure of asymmetrical waveguides were studied as the laser system. The spatial and spectral features of laser oscillation of genuine and hollow waveguides were determined. Their lasing thresholds of a two-order difference of pumping power were identified. The calculated cutoff thickness for waveguides of 100 nm did not exceed their actual thickness of 300nm. The overall pattern of stimulated emission included two concurrent processes: one-mode waveguide lasing and the lateral beam emission of small divergence emanated through the waveguide wall as leaky modes. The comparison of the open angle of lateral beams and grazing angles of the waveguide lasing mode provided insight into the effect as the leaky mode emission converted in the Lummer-Gehrcke interference.