Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, China.
Nanoscale. 2013 Jul 21;5(14):6545-51. doi: 10.1039/c3nr01306e. Epub 2013 Jun 12.
We propose and justify by the finite-difference time-domain method an efficient strategy to enhance the spontaneous emission of a fluorophore with a multi-resonance plasmonic antenna. The custom-designed asymmetrical antenna consists of two plasmonic nanoparticles with different sizes and is able to couple efficiently to free space light through multiple localized surface plasmon resonances. This design simultaneously permits a large near-field excitation near the antenna as well as a high quantum efficiency, which results in an unusual and significant enhancement of the fluorescence of a single emitter. Such an asymmetrical antenna presents intrinsic advantages over single particle or dimer based antennas made using two identical nanostructures. This promising concept can be exploited in the large domain of light-matter interaction processes involving multiple frequencies.
我们提出并通过时域有限差分法证明了一种有效的策略，即用多共振等离子体天线增强荧光团的自发发射。该定制设计的非对称天线由两个具有不同尺寸的等离子体纳米粒子组成，能够通过多个局域表面等离子体共振有效地与自由空间光耦合。这种设计同时允许在天线附近产生大的近场激发和高的量子效率，从而导致单发射器荧光的异常显著增强。与使用两个相同纳米结构的单个粒子或二聚体天线相比，这种不对称天线具有内在优势。这个有前途的概念可以在涉及多个频率的光物质相互作用过程的大领域中得到利用。
