Surface-Plasmon-Induced Modification on the Spontaneous Emission Spectrum via Subwavelength-Confined Anisotropic Purcell Factor
Surface-Plasmon-Induced Modification on the Spontaneous Emission Spectrum via Subwavelength-Confined Anisotropic Purcell Factor
复制标题
通过亚波长限制各向异性 Purcell 因子对自发发射光谱进行表面等离子体诱导修改
DOI：
10.1021/nl300655n
复制
发表时间：
2012-05-01
期刊：
影响因子：
10.8
通讯作者：
Gong, Qihuang
中科院分区：
文献类型：
--
作者：
Gu, Ying;Wang, Luojia;Gong, Qihuang
从理论上论证了利用各向异性珀塞尔因子控制四能级原子自发发射线宽的机理；如果两个偶极矩的偏振角平分线位于大/小珀塞尔因子的轴上，相消/相长干涉会使荧光中心谱线变窄/变宽。限制在亚波长光学模式体积内的赛尔因子的大各向异性导致接近金属纳米线的原子的谱线快速变窄，周期性金属纳米结构附近的周期性变化的衰减率后产生纳米级线宽脉冲，以及定制设计的共振等离子体纳米结构附近的自发发射光谱的显着改变。该组合系统为超紧凑有源量子器件的应用开辟了良好的前景。
The mechanism of using the anisotropic Purcell factor to control the spontaneous emission linewidths in a four-level atom is theoretically demonstrated; if the polarization angle bisector of the two dipole moments lies along the axis of large/small Purcell factor, destructive/constructive interference narrows/widens the fluorescence center spectral lines. Large anisotropy of the Purcell factor, confined in the subwavelength optical mode volume, leads to rapid spectral line narrowing of atom approaching a metallic nanowire, nanoscale line width pulsing following periodically varying decay rates near a periodic metallic nanostructure, and dramatic modification on the spontaneous emission spectrum near a custom-designed resonant plasmon nanostructure. The combined system opens a good perspective for applications in ultracompact active quantum devices.