Phosphate glass matrices prepared for optic microcavity

Quantum dot optic microcavity device had potential application in field of quantum information technology using as the low threshold laser and single photon light source etc. High density of quantum dot need be implanted into the glass microsphere with high dielectric constants in order to realize the optic gain and lasing. The glass formation ability, infrared, crystallization thermal stability and microcavity forming ability in the ZnO-P₂O₅, CdO-P₂O₅ and CdS-P₂O₅ binary phosphate glass system were investigated. The maximum solubility of ZnO in the glass is 0.6 mole fraction, and that of CdO and CdS is 0.4 mole fraction. The glass matrices have a similar light absorption character to those commercial cut-off filter glass, which was not dependent on the composition of the glass. The α-Zn₂P₂O₇ or CdS solid phase was precipitated in the crystallized glass matrices, where CdS phase has a uniform distribution in matrices. The powdered glass matrices can easily be formed into microcavity with a perfectly round sphere using thermal spray method. It was concluded that the ZnO-P₂O₅, and CdS-P₂O₅ binary phosphate glass can be formed into optic microcavity and the high density of II-VI group quantum dot can grow in CdS-P₂O₅ glass matrices.