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研究了介质加载型表面等离子体(DLSPP)波导中发光粒子的自发辐射特性。通过经典偶极子近似,给出了发光粒子在SPP波导任意位置处的自发辐射速率与自发辐射耦合成表面等离子体(SPP)导波模概率的计算方法;采用有限元法(FEM)模拟计算了单模DLSPP波导中若丹明6G(R6G)发光粒子的自发辐射速率和自发辐射耦合成SPP模式的概率。模拟结果表明,在DLSPP波导中,当发光粒子距金属界面较近时,自发辐射速率大幅增强,当远离金属界面时,自发辐射速率降低并趋于真空中的值;同时,DLSPP波导中发光粒子自发辐射耦合成SPP模式的概率也与其位置相关,当处在波导截面中心位置时,自发辐射耦合成SPP导波模的概率可高达70%。基于上述模拟结果,指出通过优化发光粒子在截面上的掺杂分布,可以提高截面上平均粒子数反转度,也可以提高截面上发光粒子自发辐射耦合成SPP导波模的总效率。
The spontaneous emission properties of luminescent particles in a media-loaded surface plasmon (DLSPP) waveguide were investigated. Through the classical dipole approximation, the calculation method of the spontaneous emission rate of the luminescent particle coupled to the surface plasmon (SPP) guided mode at any position of the SPP waveguide is given. The finite element method (FEM) The probability of the spontaneous emission rate and the spontaneous emission coupling into the SPP mode of the rhodamine 6G (R6G) luminescent particles in a single-mode DLSPP waveguide were investigated. The simulation results show that the spontaneous emission rate of DLSPP waveguide is greatly enhanced when the luminescent particles are closer to the metal interface in the DLSPP waveguide, and the spontaneous emission rate decreases and tends to be in the vacuum when away from the metal interface. Meanwhile, the luminescent particles The probability of spontaneous emission coupling into the SPP mode is also related to its position, and the probability of spontaneous emission coupling into the SPP guided mode can be as high as 70% at the center of the waveguide cross section. Based on the above simulation results, it is pointed out that by optimizing the doping distribution of the light-emitting particles in the cross-section, the average number of particles in the cross-section can be increased, and the total efficiency of spontaneous coupling of the light-emitting particles into the SPP guided mode can also be improved.