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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Second Harmonic Excitation Spectroscopy of Silver Nanoparticle Arrays
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Second Harmonic Excitation Spectroscopy of Silver Nanoparticle Arrays

机译：银纳米粒子阵列的二次谐波激发光谱

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Frequency-scanned excitation profiles of coherent second harmonic generation (SHG) were measured for silver nanoparticle arrays prepared by nanosphere lithography.The frequency of the fundamental beam did not coincide with the localized surface plasmon resonance (LSPR) of the nanoparticles and was tuned so that the coherent second harmonic (SH) emission was in the region of the LSPR at 720-750 nm.The SH emission from the arrays was compared with a smooth silver film to identify an enhancement of SH emission efficiency that peaks near approx650 nm for nanoparticles 50 nm in height.The polarization and orientation dependence of this enhancement suggests that it is related to a dipolar LSPR mode polarized normal to the plane of the substrate.Linear extinction spectra are dominated by in-plane dipoles and do not show this weak out-of-plane LSPR mode.The nanoparticle arrays are truncated tetrahedrons symmetrically oriented by nanosphere lithography to cancel SH from in-plane dipoles which allows observation of the weak out-of-plane component.
机译：测量了通过纳米球光刻技术制备的银纳米粒子阵列的相干二次谐波（SHG）的频率扫描激发曲线，基波的频率与纳米粒子的局部表面等离振子共振（LSPR）不一致，并对其进行了调谐。相干的二次谐波（SH）发射在LSPR的720-750 nm区域内。将阵列的SH发射与光滑的银膜进行比较，以确定纳米粒子50的SH发射效率的增强峰值在约650 nm附近。这种增强的极化和取向相关性表明，它与垂直于基板平面极化的偶极LSPR模式有关。线性消光光谱由平面内偶极控制，没有显示出这种弱的平面LSPR模式。纳米颗粒阵列是通过纳米球光刻对称取向的截短的四面体，以消除平面内偶极子中的SH使得无法观察到较弱的平面外分量。

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