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Quantitatively analysis of nonlinear/linear nanofocusing of plasmonic tips array driven via radial vector beam
Optik ( IF 3.1 ) Pub Date : 2021-06-10 , DOI: 10.1016/j.ijleo.2021.167409
Donghui Bai , Lu Zhang , Chao Meng , Lei Xu , Feng Gao , Wending Zhang

Electric field enhancement of the plasmonic tip-based nanofocusing light field determines the interaction efficiency of light and matter. Herein, the nonlinear/liner nanofocusing of the plasmonic tips array (PTA) is quantitatively analyzed, under excitation of the radial vector beam (RVB) and the linear polarization beam (LPB), respectively. Second harmonic (SH) emission intensity of PTA, under ultrafast RVB excitation, has been increased 18.6 times than that of the ultrafast LPB excitation. Experimental result is coincided with the theoretical prediction of 20.5 times, revealing that PTA has better nonlinear nanofocusing under excitation of the ultrafast RVB. The linear nanofocusing is examined via surface-enhanced Raman scattering (SERS). Under continuous wave RVB excitation, Raman scattering intensity of 4-Mercaptobenzoic acid (4MBA) is increased 4.5 times than that of LPB excitation, coinciding with the theoretically calculated electric field intensity enhancement of 4.8 times. Furthermore, the linear nanofocusing of PTA is examined using Raman scattering of the monolayer graphene, revealing that the linear nanofocusing of PTA will be slightly deteriorated, when a monolayer graphene is coated on PTA. This method may be adopted as a plasmonic tip-based nanofocusing light field with significant electric field enhancement to increase the light-matter nonlinear/linear interaction efficiency.



中文翻译:

径向矢量束驱动的等离子体尖端阵列非线性/线性纳米聚焦的定量分析

基于等离子体尖端的纳米聚焦光场的电场增强决定了光与物质的相互作用效率。在此,分别在径向矢量光束 (RVB) 和线性偏振光束 (LPB) 的激发下,定量分析了等离子体尖端阵列 (PTA) 的非线性/线性纳米聚焦。在超快 RVB 激发下,PTA 的二次谐波 (SH) 发射强度比超快 LPB 激发提高了 18.6 倍。实验结果与理论预测的20.5倍吻合,表明PTA在超快RVB激发下具有更好的非线性纳米聚焦。通过表面增强拉曼散射 (SERS) 检查线性纳米聚焦。在连续波 RVB 激励下,4-巯基苯甲酸 (4MBA) 的拉曼散射强度比 LPB 激发增加 4.5 倍,与理论计算的电场强度增强 4.8 倍一致。此外,使用单层石墨烯的拉曼散射检查 PTA 的线性纳米聚焦,表明当单层石墨烯涂覆在 PTA 上时,PTA 的线性纳米聚焦会略微恶化。该方法可用作具有显着电场增强的基于等离子体尖端的纳米聚焦光场,以提高光-物质非线性/线性相互作用效率。使用单层石墨烯的拉曼散射检查 PTA 的线性纳米聚焦,表明当单层石墨烯涂覆在 PTA 上时,PTA 的线性纳米聚焦会略微恶化。该方法可用作具有显着电场增强的基于等离子体尖端的纳米聚焦光场,以提高光-物质非线性/线性相互作用效率。使用单层石墨烯的拉曼散射检查 PTA 的线性纳米聚焦,表明当单层石墨烯涂覆在 PTA 上时,PTA 的线性纳米聚焦会略微恶化。该方法可用作具有显着电场增强的基于等离子体尖端的纳米聚焦光场,以提高光-物质非线性/线性相互作用效率。

更新日期:2021-06-19
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