等离子体纳米天线阵列中的风扇共振增强级联场增强及其SERS应用
Fano-resonance boosted cascaded field enhancement in a plasmonic nanoparticle-in-cavity nanoantenna array and its SERS application
摘要：
级联光场增强（CFE）可以在一些特殊设计的多尺度等离子体纳米结构中实现，其中在纳米尺度体积下产生极强的场对于许多应用至关重要，例如表面增强拉曼光谱（SERS）。在这里，我们提出了一种实现高质量等离子体纳米粒子腔（PIC）纳米天线阵列，其中纳米粒子暗模式与高阶纳米腔亮模式之间的强耦合可以在目标波长处产生法诺共振的策略。Fano共振可以有效地增强PIC中的CFE，场增强因子高达5 × 10 ^2。利用室温纳米压印光刻技术，开发了一种高性价比、高可靠性的纳米加工方法，用于制作高质量的PIC阵列。这种技术保证在每个纳米腔的底部仅产生一个金纳米颗粒，这对于产生预期的CFE至关重要。作为PIC阵列性能和应用的演示，它被用作活性SERS基底检测4-氨基苯硫酚分子。实验上获得了高达2 × 10 ~ 7的SERS增强因子，验证了该器件的场增强和潜力。
英文摘要：
Cascaded optical field enhancement (CFE) can be realized in some specially designed multiscale plasmonic nanostructures, where the generation of extremely strong field at nanoscale volume is crucial for many applications, for example, surface enhanced Raman spectroscopy (SERS). Here, we propose a strategy of realizing a high-quality plasmonic nanoparticle-in-cavity (PIC) nanoantenna array, where strong coupling between a nanoparticle dark mode with a high order nanocavity bright mode can produce Fano resonance at a target wavelength. The Fano resonance can effectively boost the CFE in the PIC, with a field enhancement factor up to 5X10^2. A cost-effective and reliable nanofabrication method is developed with room temperature nanoimprinting lithography to manufacture high-quality PIC arrays. This technique guarantees the generation of only one gold nanoparticle at the bottom of each nanocavity, which is crucial for the generation of the expected CFE. As a demonstration of the performance and application of the PIC array, it is used as active SERS substrate for detecting 4-aminothiophenol molecules. The SERS enhancement factor up to 2X10^7 is obtained experimentally, verifying the field enhancement and potential of this device.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
