研究原子在金属结构中的自发辐射时引入单层石墨烯薄膜, 利用石墨烯特殊的光电特性来调控原子的自发辐射率.推导了局态密度与自发辐射率的格林函数表示形式, 并结合频域有限差分方法进行了数值模拟.分析结果表明: 随着化学势的增大, 自发辐射波峰出现蓝移现象, 且自发辐射率波峰得到增强, 理论上实现了原子自发辐射率峰值位置与幅度的调制.研究结果可以为新型纳米器件及光电子设备的制造和优化提供参考.

The monolayer grapheme film was employed in the metal structures when researching the spontaneous emission of atoms. The spontaneous emission of atoms was controlled by the special photoelectric properties of graphene. The local density of electromagnetic states was numerically calculated with the electric dyadic Green′s function through the finite-difference frequency-domain method. The results show that with the increase of chemical potential, spontaneous emission peak appears blue shift phenomenon and the spontaneous emission are enhanced. The tunability of the peak position and amplitude of the spontaneous emission of the atoms is theoretically achieved. The theoretical results can be used as references for the fabrication and optimization of novel nano-devices and optoelectronic devices.