利用 DNA 辅助光刻制备的领结形孔径–颗粒杂化纳米结构中的拉曼增强
Raman Enhancement in Bowtie-Shaped Aperture-Particle Hybrid Nanostructures Fabricated with DNA-Assisted Lithography
AI总结：
该研究利用 DNA 辅助光刻制备银质领结颗粒与孔径对准的杂化 SERS 衬底，并通过实验和 FDTD 模拟验证其可实现四倍拉曼增强、抑制背景并引入额外共振。
摘要：
我们报道了基于 DNA 辅助光刻（DALI）和材料层状构型的高效表面增强拉曼光谱（SERS）支撑衬底。具体而言，我们利用纳米尺度 DNA origami（DNA 折纸）领结模板，形成由对准的银质领结形颗粒与银膜中相似形状孔径组成的杂化纳米结构。我们假设，与常见的基于颗粒的 SERS 衬底相比，这种特定几何结构可带来四倍的拉曼增强优势；随后，我们通过实验和时域有限差分模拟验证了这些假设。总之，我们以 DALI 制备的杂化结构抑制了背景发射，使发射主要来自高场增强区域，并支持与纳米尺度孔径相关的额外共振。最后，这些纳米孔径还增强了与下方领结颗粒共振相关的场。因此，我们基于 DNA origami 的纳米加工方案所具有的多功能性与并行特性，以及上述杂化结构的全部特征，使这种光学共振衬底对各类基于 SERS 的应用具有吸引力。
英文摘要：
We report on efficient surface-enhanced Raman spectroscopy (SERS) supporting substrates, which are based on DNA-assisted lithography (DALI) and a layered configuration of materials. In detail, we used nanoscopic DNA origami bowtie templates to form hybrid nanostructures consisting of aligned silver bowtie-shaped particles and apertures of similar shape in a silver film. We hypothesized that this particular geometry could facilitate a four-fold advantage in Raman enhancement compared to common particle-based SERS substrates, and further, we verified these hypotheses experimentally and by finite difference time domain simulations. In summary, our DALI-fabricated hybrid structures suppress the background emission, allow emission predominantly from the areas of high field enhancement, and support additional resonances associated with the nanoscopic apertures. Finally, these nanoapertures also enhance the fields associated with the resonances of the underlying bowtie particles. The versatility and parallel nature of our DNA origami-based nanofabrication scheme and all of the above-mentioned features of the hybrid structures therefore make our optically resonant substrates attractive for various SERS-based applications.
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