量子点光学微腔器件在低阈值激光器和单光子光源等量子信息处理技术领域有重要的应用前景。为了有效地实现受激辐射,光学微腔需要在高介电常量的玻璃微球中嵌入高浓度的量子点。为此使用玻璃技术开展了在磷酸盐玻璃中生长高浓度Ⅱ-Ⅵ族量子点的研究,探索了ZnO-P2O5、CdO-P2O5和CdS-P2O5二元磷酸盐玻璃的形成能力、红外通过率、结晶行为和微腔成形能力。在这些玻璃基体中,ZnO的最大溶解度为0.6, CdO和CdS的溶解度为0.4;基体表现出和商用截止型过滤片玻璃相似的光吸收特性,并与玻璃的种类和成分含量无关;基体晶化后可以析出α-Zn2P2O7或CdS等晶相,其中CdS相均匀分布在试样中;磨细的玻璃基体可以成型为球表面完整和椭圆度小的微腔。试验结果表明,ZnO-P2O5和CdS-P2O5等二元磷酸盐玻璃可以成型为光学微腔并可以有效地生长出高浓度的Ⅱ-Ⅵ族量子点。

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.