Department of Physics, Key Laboratory of Acoustic and Photonic Materials and Devices of Ministry of Education, Wuhan University, Wuhan 430072, People's Republic of China.
ACS Nano. 2010 Sep 28;4(9):5003-10. doi: 10.1021/nn100578b.
Efficient plasmon-mediated excitation energy transfer between the CdSe/ZnS semiconductor quantum dots (QDs) across the silver nanowire array up to 560 nm in length is observed. The subwavelength imaging and spectral response of the silver nanowire arrays with near-field point-source excitations are revealed by theoretical simulations. Our studies demonstrate three advantages of the nanosystem: efficient exciton-plasmon conversion at the input side of the array through near-field strong coupling, directional waveguidance and resonant transmission via half-wave plasmon modes of the nanowire array, and subwavelength imaging at the output side of the array. These advantages allow a long-range radiative excitation energy transfer with a high efficiency and a good directionality.
观察到 CdSe/ZnS 半导体量子点（QD）在长达 560nm 的银纳米线阵列中通过等离激元进行有效的激发能量转移。通过理论模拟揭示了近场点源激发下银纳米线阵列的亚波长成像和光谱响应。我们的研究表明该纳米系统具有三个优点：通过近场强耦合在阵列的输入侧实现高效的激子-等离激元转换、通过纳米线阵列的半波等离激元模式实现波导和共振传输、以及在阵列的输出侧进行亚波长成像。这些优点允许进行远距离辐射激发能量转移，具有高效率和良好的方向性。
