The authors report the fabrication and characteristics of organic soli
d-state waveguide lasers with feedback from photolithographically defi
ned rhomboid photonic bandgap lattice. The lattice is formed by etchin
g holes of depth 10-40nm in SiO2 and filling them with the organic gai
n medium. The gain medium is part of a planar waveguide formed by air/
organic layer/SiO2.