Large-Scale Plasmonic Hybrid Framework with Built-In Nanohole Array as Multifunctional Optical Sensing Platforms.,Small

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Large-Scale Plasmonic Hybrid Framework with Built-In Nanohole Array as Multifunctional Optical Sensing Platforms.
Small ( IF 13.0 ) Pub Date : 2020-02-19 , DOI: 10.1002/smll.201906459
Xuejing Wang ₁ , Xuedan Ma ₂ , Enzheng Shi ₃ , Ping Lu ₄ , Letian Dou ₃ , Xinghang Zhang ₁ , Haiyan Wang _{1,

5}

Affiliation

Light coupling with patterned subwavelength hole arrays induces enhanced transmission supported by the strong surface plasmon mode. In this work, a nanostructured plasmonic framework with vertically built-in nanohole arrays at deep-subwavelength scale (6 nm) is demonstrated using a two-step fabrication method. The nanohole arrays are formed first by the growth of a high-quality two-phase (i.e., Au-TiN) vertically aligned nanocomposite template, followed by selective wet-etching of the metal (Au). Such a plasmonic nanohole film owns high epitaxial quality with large surface coverage and the structure can be tailored as either fully etched or half-way etched nanoholes via careful control of the etching process. The chemically inert and plasmonic TiN plays a role in maintaining sharp hole boundary and preventing lattice distortion. Optical properties such as enhanced transmittance and anisotropic dielectric function in the visible regime are demonstrated. Numerical simulation suggests an extended surface plasmon mode and strong field enhancement at the hole edges. Two demonstrations, including the enhanced and modulated photoluminescence by surface coupling with 2D perovskite nanoplates and the refractive index sensing by infiltrating immersion liquids, suggest the great potential of such plasmonic nanohole array for reusable surface plasmon-enhanced sensing applications.

中文翻译：

具有内置纳米孔阵列的多功能等离子混合框架作为多功能光学传感平台。

光与图案化的亚波长孔阵列耦合，可增强由强表面等离子体激元模式支持的透射。在这项工作中，使用两步制造方法演示了在深亚波长范围（6 nm）具有垂直内置纳米孔阵列的纳米结构等离子体框架。首先通过生长高质量的两相（即Au-TiN）垂直排列的纳米复合材料模板，然后选择性地对金属（Au）进行湿法刻蚀来形成纳米孔阵列。这样的等离子体纳米孔膜具有高的外延质量和大的表面覆盖率，并且可以通过仔细地控制蚀刻过程将结构定制为完全蚀刻或中途蚀刻的纳米孔。化学惰性和等离激元的TiN在维持尖锐的孔边界和防止晶格畸变方面发挥着作用。证明了在可见光条件下的光学性能，如增强的透射率和各向异性介电功能。数值模拟表明，表面等离激元模式的扩展和孔边缘处的强场增强。两个演示，包括通过与2D钙钛矿纳米板进行表面耦合来增强和调制光致发光，以及通过浸入浸没液体进行折射率感测，都表明这种等离激元纳米孔阵列在可重复使用的表面等离激元增强感测应用中具有巨大的潜力。

更新日期：2020-03-20

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