Organic mu cavities based on thermally evaporated TeOx-LiF distributed Bragg reflectors

We report on the realization of high-quality organic microcavities consisti ng of distributed Bragg reflectors based on lithium fluoride (LiF) and tell urium dioxide (TeOx) deposited by thermal evaporation. The materials are tr ansparent in the range of 350 nm-5 mum and have an evaporation temperature of about 1000 K. The large difference in the refractive index (about 0.9 in the visible and near-infrared range) allows one to obtain reflectivity hig her than 99% over a spectral region about 200 nm wide with a small number o f periods. The mirror deposition technique is suitable for the fabrication of organic quantum microcavities in a single deposition process. Three full y evaporated organic lambda cavities with Phyrrometene 580 as the active ma terial are described. The cavities show a Q value of up to 300, good unifor mity, and reproducibility. (C) 2001 American Institute of Physics.