Nd^(3+)掺杂硫系玻璃微球荧光腔量子电动力学增强效应  

Cavity Quantum Electrodynamic Fluorescence Enhancement Effect of Nd^(3+)-Doped Chalcogenide Glass Microspheres

作　　者：李超然[1] 吴越豪[1] 戴世勋[1] 路来伟[1] 吕社钦[1] 沈祥[1] 张培晴[1] 许银生[1] 

机构地区：[1]宁波大学高等技术研究院红外材料与器件实验室,浙江宁波315211

出　　处：《光学学报》2014年第2期219-223,共5页Acta Optica Sinica

基　　金：教育部新世纪优秀人才计划(NCET-10-0976);宁波市新型光电功能材料及器件创新团队项目(2009B21007);宁波大学王宽诚幸福基金

摘　　要：采用粉料漂浮高温熔融法自制Nd3+掺杂硫系玻璃微球,研究了腔量子电动力学增强效应对稀土掺杂硫系玻璃微球荧光光谱的影响。把直径90.53μm的硫系玻璃微球与锥腰直径1.02μm的石英光纤锥耦合,将808nm抽运激光导入微球,荧光光谱存在分立的共振峰。根据米氏散射理论公式,计算得到TE偏振态下基模的三个共振峰位置,确定了这三个共振峰的模式序数。增强因子η≈1122,这表明微球荧光自发辐射速率增强幅度为1122倍。在基模条件下对原增强因子公式进行近似化简,并利用近似公式进行估算得到η≈1167,误差为4%。Homemade Nd3＋ doped chalcogenide glass microspheres are fabricated using the method of melting floating glass powder at high temperature. It is reported that the fluorescence spectra of chalcogenide glass microsphere are modified by the cavity quantum electrodynamic enhancement effect. A 90.53-μm diameter chalcogenide glass microsphere is coupled with the silica fiber-taper that has a cross-sectional diameter of 1.02μm. An 808-nm laser is used as a pumping source for the microsphere cavity and separate resonance peaks found in the microsphere fluorescence spectra. According to the Mie scattering theory, positions and mode ordinals of three resonance peaks for the fundamental TE mode are calculated. Based on the formula for calculating the cavity quantum electrodynamic enhancement factor, it is found that the enhancement factor η of our chalcogenide glass microsphere is 1122, which indicates that spontaneous fluorescence emission rate is enhanced by 1122 times. By simplifying the enhancement factor formula for the fundamental TE mode, it is found that the enhancement factor estimated is 1167, which indicates an error rate of 4 %.

关 键 词：光学器件 腔量子电动力学 米氏散射理论 硫系玻璃 微球 回音壁模式 

分 类 号：O433.1[机械工程—光学工程] O413.2[理学—光学]