A centimeter-scale sub-10 nm gap plasmonic nanorod array film as a versatile platform for enhancing light-matter interactions.
A centimeter-scale sub-10 nm gap plasmonic nanorod array film as a versatile platform for enhancing light-matter interactions.
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DOI：
10.1039/c5nr03960f
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发表时间：
2015-09
期刊：
影响因子：
6.7
通讯作者：
Zhangkai Zhou;Jiancai Xue;Zebo Zheng;Jiahua Li;Y. Ke;Ying Yu;Junbo Han;W. Xie;S. Deng
中科院分区：
文献类型：
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作者：
Zhangkai Zhou;Jiancai Xue;Zebo Zheng;Jiahua Li;Y. Ke;Ying Yu;Junbo Han;W. Xie;S. Deng
具有亚 10 nm 间隙的强耦合等离子体纳米结构可以实现强烈的电场增强，这极大地有利于各种光与物质的相互作用。从实际应用的角度来看，这种纳米结构应该具有低成本、易于制造和加工、大规模且高产率的超小间隙，并且易于与其他功能组件集成。然而，如今可靠制造这些纳米结构的技术通常涉及复杂、耗时且昂贵的光刻程序，这些程序要么受到低通量要么获得的小面积的限制。另一方面，迄今为止，大多数对亚10 nm带隙纳米结构的研究主要集中在表面增强拉曼散射和高次谐波产生上，而对其他非线性光学性质尚未进行探索。在这项工作中，我们使用无需任何光刻程序的可扩展工艺，展示了具有明确的亚10 nm粒子间间隙的厘米级有序等离子体纳米棒阵列薄膜（PNRAF），作为强烈增强光与物质相互作用的通用平台。具体来说，我们表明，由于其等离子体引起的局域电磁场增强，Au PNRAF 可以表现出非凡的本征多光子雪崩发光 (MAPL) 和非线性可饱和吸收 (SA)。此外，PNRAF 可以轻松地与半导体量子点 (SQD) 以及宽带隙半导体集成，从而分别大幅增强其荧光和光电流响应。我们的方法可以很容易地推广到由其他等离子体金属甚至半导体材料组成的纳米棒阵列薄膜，这些薄膜可以具有源自不同材料的多种功能。总的来说，我们的研究结果为未来光子和光电应用的超小间隙纳米结构的设计和制造提供了潜在的策略。
Strongly coupled plasmonic nanostructures with sub-10 nm gaps can enable intense electric field enhancements which greatly benefit the various light-matter interactions. From the point view of practical applications, such nanostructures should be of low-cost, facile fabrication and processing, large-scale with high-yield of the ultrasmall gaps, and easy for integration with other functional components. However, nowadays techniques for reliable fabrication of these nanostructures usually involve complex, time-consuming, and expensive lithography procedures, which are limited either by their low-throughput or the small areas obtained. On the other hand, so far most of the studies on the sub-10 nm gap nanostructures mainly focused on the surface-enhanced Raman scattering and high-harmonic generations, while leaving other nonlinear optical properties unexplored. In this work, using a scalable process without any lithography procedures, we demonstrated a centimeter-scale ordered plasmonic nanorod array film (PNRAF) with well-defined sub-10 nm interparticle gaps as a versatile platform for strongly enhanced light-matter interactions. Specifically, we showed that due to its plasmon-induced localized electromagnetic field enhancements, the Au PNRAF could exhibit extraordinary intrinsic multi-photon avalanche luminescence (MAPL) and nonlinear saturable absorption (SA). Furthermore, the PNRAF can be easily integrated with semiconductor quantum dots (SQDs) as well as wide bandgap semiconductors to strongly enhance their fluorescence and photocurrent response, respectively. Our method can be easily generalized to nanorod array films consisting of other plasmonic metals and even semiconductor materials, which can have multiple functionalities derived from different materials. Overall, the findings in our study have offered a potential strategy for design and fabrication of nanostructures with ultrasmall gaps for future photonic and optoelectronic applications.