光子晶体增强中红外发光研究

Enhancing the Mid-infrared Fluorescence Emission by Designing Photonic Crystals

稀土掺杂硫系玻璃是实现中红外发光的重要手段,通过在稀土掺杂硫系玻璃样品上构造光子晶体结构可以大大增强其发光效率。制备了Tm3+离子掺杂硫系玻璃样品并测试了其光谱特性,通过设计光子晶体结构来增强Tm3+离子跃迁产生的3.73 mm处的荧光强度。利用有限时域差分法(FDTD)进行运算,模拟结果表明,通过优化设计的光子晶体结构参数,掺杂样品在3.73 mm处的光子态密度相比于未采用光子晶体结构所产生的光子态密度有极大提高,计算其Purcell放大因子可达到未进行结构设计的50倍以上。光子态密度的极大提高以及Purcell放大因子为增强发光强度提供了理论依据,该研究结果对实现高效率中红外光源器件具有重要的指导意义。

Rare earth doped chalcogenide glasses is an important way to achieve mid-infrared luminescence.By designing photonic crystal structure on the sample, the luminous efficiency of the glass can be enhanced greatly. Tm3 ＋doped chalcogenide glass is prepared and the related optical properties are tested. Photonic crystal structure on the glass sample is designed to enhance the emission of 3.73 mm fluorescence which generated by the transition of Tm3 ＋ions. Finite difference time domain（FDTD） simulation shows that the photon density of states at 3.73 mm is greatly enhanced in the sample with designed photonic crystal, the Purcell amplification factor can be over 50 times than that in the bulk sample. This greatly increment of the photon density of states and the Purcell factor provides a theoretical basis for the enhancement of luminescence. The results of this work can be used to achieve high efficiency infrared light source device.