Plasmon-Modulated Photoluminescence of Single Gold Nanobeams
Plasmon-Modulated Photoluminescence of Single Gold Nanobeams
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DOI：
10.1021/acsphotonics.5b00341
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发表时间：
2015-09
期刊：
影响因子：
7
通讯作者：
A. Wan;Tao Wang;Tingting Yin;Anran Li;Hailong Hu;Shuzhou Li;Zexiang Shen;C. Nijhuis
中科院分区：
文献类型：
--
作者：
A. Wan;Tao Wang;Tingting Yin;Anran Li;Hailong Hu;Shuzhou Li;Zexiang Shen;C. Nijhuis
在这项工作中，我们研究了单个Au纳米梁（NB）的光致发光（PL）的调制由银纳米线（NW）的表面等离子体和两个纳米结构之间的差距等离子体。通过改变激发纳米结构的激光的偏振并控制两个纳米结构之间的间隔距离d，我们发现Ag NW的横向表面等离子体共振增强了Au NB的PL（在520 nm处），在d = 7 nm处具有最大效应。PL增强（在520 nm处）被猝灭，并且在d < 7 nm的较长波长处观察到新的PL峰。PL猝灭效应可以通过Ag NW和Au NB之间的四极等离子体共振来理解，并且可以通过使用传输矩阵透射率计算获得的作为d的函数的模式色散来定性地解释。FDTD模拟表明，新的PL峰在一个较长的波长是由波导模式之间的间隙等离子体激元的Au NB和Ag NW。
In this work, we investigate the modulation of the photoluminescence (PL) of a single Au nanobeam (NB) by the surface plasmons of a Ag nanowire (NW) and the gap plasmons between the two nanostructures. By changing the polarization of the laser that excites the nanostructure and controlling the separation distance d between the two nanostructures, we found that the transverse surface plasmon resonance of the Ag NW enhanced the PL (at 520 nm) of the Au NB with a maximum effect at d = 7 nm. The PL enhancement (at 520 nm) was quenched and a new PL peak was observed at a longer wavelength for d < 7 nm. The PL quenching effect could be understood by the quadrupole-like plasmonic resonance between the Ag NW and the Au NB and be qualitatively explained by the mode dispersion as a function of d obtained using the transfer matrix transmittance calculation. FDTD simulations show that the new PL peak at a longer wavelength is caused by the waveguide-mode gap plasmons between the Au NB and the Ag NW.