Piatkowski D, Hartmann N, Macabelli T, Nyk M, Mackowski S, Hartschuh A
Department Chemie and CeNS, Ludwig-Maximilians-Universität München, 81377 München, Germany.
Nanoscale. 2015 Jan 28;7(4):1479-84. doi: 10.1039/c4nr05209a.
We demonstrate efficient coupling between plasmons in a single silver nanowire and nanocrystals doped with rare earth ions, α-NaYF4:Er(3+)/Yb(3+). Plasmonic interaction results in a sevenfold increase of the up-converted emission of nanocrystals located in the vicinity of the nanowires as well as much faster luminescence decays. The enhancement of the emission can be precisely controlled by the polarization of the excitation laser and is significantly stronger for polarization parallel to the nanowire antennas. Imaging of angular-resolved emission patterns in the Fourier plane reveals plasmon-mediated luminescence, where the up-converted radiation is emitted via the nanowire antennas as leakage radiation.
我们展示了单根银纳米线中的等离激元与掺杂稀土离子α-NaYF4:Er(3+)/Yb(3+)的纳米晶体之间的高效耦合。等离激元相互作用导致位于纳米线附近的纳米晶体的上转换发射增强了七倍，并且发光衰减也快得多。发射的增强可以通过激发激光的偏振精确控制，对于与纳米线天线平行的偏振，增强效果显著更强。在傅里叶平面中对角分辨发射图案的成像揭示了等离激元介导的发光，其中上转换辐射作为泄漏辐射通过纳米线天线发射。
