Low threshold optically pumped lasing from MEH-PPV quasi-periodic photonic crystal microcavity.

An optically pumped two-dimensional organic quasi-crystal microcavity laser is demonstrated based on conjugated polymer poly(2-methoxy, 5-(2-3ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV). The optical resonator consists of the octagonal quasi-crystal for light localization in-plane by the bandgap effect and the distributed Bragg reflector introduced between the slab-substrate interface by inhibiting the scattering and absorption of light in the substrate to achieve vertical confinement of the light. A modified point-defect traps and localizes photons into the microcavity, forcing the wave oscillation along the vertical waveguide. The experimental results show that the single-mode lasing action by optical pumping is observed at 602.2 nm with an FWHM of 0.7 nm. The threshold of lasing is lowered to 6.9 μJ/pulse.