基于表面等离激元的量子相干效应的理论研究

起源于金属中自由电子集体振荡的表面等离激元，具有超小的光学模式体积和亚波长局域的近场增益，为纳米尺度上研究光和物质相互作用带来新的机遇．共振的纳米金属结构的近场区域，具有各向异性的珀塞尔系数，并且可以为量子体系提供近场激发．我们理论上演示了基于表面等离激元结构的单分子共振荧光、原子布居数的本征量子拍频及其在表面等离激元结构中的纳米尺度上的实现、表面等离激元诱导的各向异性珀塞尔系数导致的亚波长尺度自发辐射谱线的变化．这些结果在超紧凑的有源量子器件中有潜在应用．

A theoretical study of plasmonic-based quantum interference effects

Surface plasmons which originate from collective oscillations of free electrons in metals, associated with ultrasmall optical mode volume and subwavelength-confined field enhancement, bring new possibilities for research on nanoscale light- matter interactions. The near zone of a resonant plasmon nanostructure has anisotropic Purcell factors and can provide near field excitation for quantum systems. We theoretically demonstrated plasmonic-based resonance fluorescence of single molecules, intrinsic quantum beats of atomic populations and their nanoscale realization through the resonant plasmonic antenna, and surface-plasmon-induced modification on the spontaneous emission spectrum via subwavelength-confined anisotropic Purcell factor. These results may open some perspectives for applications in ultracompact active quantum devices.