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Enhanced spontaneous emission of electric dipole by nano-optical antenna

机译:纳米光学天线增强电偶极子的自发发射

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We study the characteristics of nano-optical antenna made of two gold nano-particles by three dimensional numerical calculations at visible and near infrared band. To carry the computational burden and guarantee the precision and speed of a 3D FDTD calculation, adaptive mesh refinement technology is used. We first highlight the concrete way of controlling over the emitter position to fulfill the requirements of larger spontaneous emission enhancement. By exciting the resonance of surface plasmon polaritons (SPPs), we find that the far field directivity is strongly influenced and obtain around 5000-fold spontaneous emission enhancement. Choosing the incident wavelength of 600nm, we compute the decay rates and radiant efficiency as a function of antenna geometry limitations, showing the particle with an aspect ratio of L/R=4 is best for enhancing spontaneous emission. Furthermore, we proceed a spectrum analysis and find an exact relationship between the particle length and resonant wavelength.
机译:我们通过在可见光和近红外波段的三维数值计算研究了由两种金纳米粒子制成的纳米光学天线的特性。为了承担计算负担并确保3D FDTD计算的精度和速度,使用了自适应网格细化技术。我们首先重点介绍控制发射器位置以满足更大的自发发射要求的具体方法。通过激发表面等离激元极化子(SPPs)的共振,我们发现远场方向性受到强烈影响,并获得约5000倍的自发发射增强。选择600nm的入射波长,我们将衰减率和辐射效率计算为天线几何形状限制的函数,表明纵横比为L / R = 4的粒子最适合增强自发发射。此外,我们进行了光谱分析,并发现了颗粒长度和共振波长之间的确切关系。

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