Here we show how surface-enhanced Raman spectroscopy (SERS) features can be fine-tuned in optically active substrates made of layered materials. To demonstrate this, we used DNA-assisted lithography (DALI) to create substrates with silver bowtie nanoparticle–aperture pairs and then coated the samples with rhodamine 6G (R6G) molecules. By varying the spacing between the aperture and particle layer, we were able to control the strength of the interlayer coupling between the plasmon resonances of the apertures and those of the underlying bowtie particles. The changes in the resulting field enhancements were confirmed by recording the Raman spectra of R6G from the substrates, and the experimental findings were supported with finite difference time domain (FDTD) simulations including reflection/extinction and near-field profiles.

中文翻译：

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通过层间间距控制颗粒-孔径混合纳米结构中的拉曼增强


在这里，我们展示了如何在由层状材料制成的光学活性基片中微调表面增强拉曼光谱 （SERS） 特征。为了证明这一点，我们使用 DNA 辅助光刻 （DALI） 创建具有银蝴蝶结纳米粒子-孔径对的衬底，然后用罗丹明 6G （R6G） 分子包被样品。通过改变孔径和颗粒层之间的间距，我们能够控制孔径的等离子体共振与底层蝴蝶结粒子的等离激元共振之间的层间耦合强度。通过记录来自衬底的 R6G 拉曼光谱来证实所得场增强的变化，实验结果得到了有限差分时域 （FDTD） 模拟的支持，包括反射/消光和近场剖面。