Tunable plasmon resonance and enhanced second harmonic generation and upconverted fluorescence of hemispheric-like silver core/shell islands.
Tunable plasmon resonance and enhanced second harmonic generation and upconverted fluorescence of hemispheric-like silver core/shell islands.
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DOI：
10.1039/c5nr03627e
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发表时间：
2015-09
期刊：
影响因子：
6.7
通讯作者：
Si-Jing Ding;Fan Nan;Da-Jie Yang;Yu-Ting Zhong;Zhong-Hua Hao;Ququan Wang
中科院分区：
文献类型：
--
作者：
Si-Jing Ding;Fan Nan;Da-Jie Yang;Yu-Ting Zhong;Zhong-Hua Hao;Ququan Wang
我们研究了半球形银核/壳岛的可调谐等离子激元共振和增强的二次谐波产生(SHG)和上转换荧光(UCF)。采用溅射技术制备了Ag、Ag/Ag2O和Ag/Ag2O/Ag岛状薄膜。渗流区附近的Ag/Ag2O/Ag核/壳岛的倍频和UCF值分别是Ag/Ag2O核/壳和Ag壳岛的2.34倍和3.94倍。P极化和S极化引起的倍频强度之比对于初始Ag岛为0.86，对于Ag/Ag2O/Ag核/壳样品为1.61。还观察到了经热处理和激光处理的银岛的倍频光强与UCF光强的可调比。讨论了Ag/Ag2O/Ag核/壳岛的倍频和超连续波增强的物理机制。我们的发现为制备具有可调倍频和UCF的等离子体增强光学非线性纳米器件提供了一种新的途径。
We investigate tunable plasmon resonance and enhanced second harmonic generation (SHG) and up-converted fluorescence (UCF) of the hemispheric-like silver core/shell islands. The Ag, Ag/Ag2O, and Ag/Ag2O/Ag island films are prepared by using a sputtering technique. The SHG and UCF of the Ag/Ag2O/Ag core/shell islands near the percolating regime is enhanced 2.34 and 3.94 times compared to the sum of two individual counterparts of Ag/Ag2O core/shell and Ag shell islands. The ratio of SHG intensity induced by p- and s-polarization is 0.86 for the initial Ag islands and increase to 1.61 for the Ag/Ag2O/Ag core/shell samples. The tunable intensity ratio of SHG to UCF of the Ag islands treated by thermal and laser annealing processes is also observed. The physical mechanism of the enhanced SHG and UCF in the Ag/Ag2O/Ag core/shell islands is discussed. Our observations provide a new approach to fabricate plasmon-enhanced optical nonlinear nanodevices with tunable SHG and UCF.