Lasing action in two-dimensional organic photonic crystal lasers with hexagonal symmetry
Abbreviated Journal Title
Appl. Phys. B-Lasers Opt.
Optics; Physics, Applied
We investigate fluorescence and lasing action from strongly modulated two-dimensional surface relief structures with hexagonal symmetry onto which thin films of optically active organic material have been deposited. As compared with second-order laser structures with square symmetry, these organic photonic crystal lasers exhibit unusual feedback mechanisms. As a result, we observe surface-emitting lasing action with a central beam normal to the surface and a hexagonal emission pattern of side-beams whose direction slightly deviates from the normal. A corresponding theoretical analysis allows us to determine the photonic bandstructure and the low-threshold laser modes in this system. These results agree very well with fluorescence data and confirm the hexagonal lasing pattern and the corresponding emission angles.
Applied Physics B-Lasers and Optics
"Lasing action in two-dimensional organic photonic crystal lasers with hexagonal symmetry" (2006). Faculty Bibliography 2000s. 6136.