Plasmonic nanostructures through DNA-assisted lithography.
Plasmonic nanostructures through DNA-assisted lithography.
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DOI：
10.1126/sciadv.aap8978
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发表时间：
2018-03
期刊：
影响因子：
13.6
通讯作者：
Toppari JJ
中科院分区：
文献类型：
--
作者：
Shen B;Linko V;Tapio K;Pikker S;Lemma T;Gopinath A;Gothelf KV;Kostiainen MA;Toppari JJ
DALI将DNA折纸与传统的自上而下的制造相结合，创造出设计者设计的高分辨率等离子纳米结构。可编程的核酸自组装使定制的、精确的纳米尺寸物体得以制造。这些结构可以进一步用作模板来构建新型材料，如金属纳米结构，由于其独特的光学性质和作为新型超材料组分的有效性而被广泛使用和探索。然而，将DNA结构的空间信息转移到金属纳米结构的方法仍然是一个挑战。我们报告了一种DNA辅助光刻(DALI)方法，它将DNA折纸的结构多功能性与传统的光刻技术相结合，以创建具有设计的等离子体性质的离散的、定义良好的、完全金属的纳米结构。DALI是一种与透明衬底兼容的并行、高通量制造方法，因此为光学测量提供了额外的优势，并产生了特征尺寸约为10 nm的结构。我们通过制作具有手性等离子激元响应的金属纳米结构和用于表面增强拉曼光谱的蝴蝶结状纳米天线来证明其可行性。我们设想DALI可以推广到大型衬底，随后将能够放大生产具有定制等离子体特征的各种金属纳米结构。
DALI combines DNA origami with conventional top-down fabrication for creating designer high-resolution plasmonic nanostructures. Programmable self-assembly of nucleic acids enables the fabrication of custom, precise objects with nanoscale dimensions. These structures can be further harnessed as templates to build novel materials such as metallic nanostructures, which are widely used and explored because of their unique optical properties and their potency to serve as components of novel metamaterials. However, approaches to transfer the spatial information of DNA constructions to metal nanostructures remain a challenge. We report a DNA-assisted lithography (DALI) method that combines the structural versatility of DNA origami with conventional lithography techniques to create discrete, well-defined, and entirely metallic nanostructures with designed plasmonic properties. DALI is a parallel, high-throughput fabrication method compatible with transparent substrates, thus providing an additional advantage for optical measurements, and yields structures with a feature size of ~10 nm. We demonstrate its feasibility by producing metal nanostructures with a chiral plasmonic response and bowtie-shaped nanoantennas for surface-enhanced Raman spectroscopy. We envisage that DALI can be generalized to large substrates, which would subsequently enable scale-up production of diverse metallic nanostructures with tailored plasmonic features.
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