论文标题
等离子辅助分布的非线性光致发光沿Au纳米线天线的波向量分析
Wavevector analysis of plasmon-assisted distributed nonlinear photoluminescence along Au nanowire antennas
论文作者
论文摘要
我们报告了由紧密焦点的激光束产生的非线性光致发光发出的波形图的定量分析，并通过表面等离子体的介导沿AU纳米线分布。非线性光致发光在沿纳米线的关键位置局部激发，以了解在显微镜的共轭傅立叶平面中构成发射模式的不同贡献。极化分辨的测量结果表明，纳米线优先散发出非线性光致发光的极化横向至长轴，接近检测极限波形，与沿长沿长轴偏振的信号相比，具有较小的方位角扩散。我们利用有限元方法通过使用放置在纳米线上的局部不相干来源来模拟观察到的方向散射。模拟结果忠实地模仿了纳米线不同部分发出的非线性信号的定向发射。
We report a quantitative analysis of the wavevector diagram emitted by nonlinear photoluminescence generated by a tightly focused pulsed laser beam and distributed along Au nanowire via the mediation of surface plasmon polaritions. The nonlinear photoluminescence is locally excited at key locations along the nanowire in order to understand the different contributions constituting the emission pattern measured in a conjugate Fourier plane of the microscope. Polarization-resolved measurements reveal that the nanowire preferentially emits nonlinear photoluminescence polarized transverse to the long axis at close to the detection limit wavevectors with a small azimuthal spread in comparison to the signal polarized along the long axis. We utilize finite element method to simulate the observed directional scattering by using localized incoherent sources placed on the nanowire. Simulation results faithfully mimic the directional emission of the nonlinear signal emitted by the different portions of the nanowire.
