Self‐Assembled Ag–TiN Hybrid Plasmonic Metamaterial: Tailorable Tilted Nanopillar and Optical Properties
Self‐Assembled Ag–TiN Hybrid Plasmonic Metamaterial: Tailorable Tilted Nanopillar and Optical Properties
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DOI：
10.1002/adom.201801180
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发表时间：
2018-12
影响因子：
9
通讯作者：
Xuejing Wang;J. Jian;Zhiguang Zhou;C. Fan;Yaomin Dai;Leigang Li;Jijie Huang;Jianing Sun;A. Donohue;P. Bermel;Xinghang Zhang;Houtong Chen;Haiyan Wang
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作者：
Xuejing Wang;J. Jian;Zhiguang Zhou;C. Fan;Yaomin Dai;Leigang Li;Jijie Huang;Jianing Sun;A. Donohue;P. Bermel;Xinghang Zhang;Houtong Chen;Haiyan Wang
限制金属等离子体纳米结构在实际设备中采用的主要挑战包括结构稳定性和大规模制造的简易性。克服这些问题可能需要新颖的超材料制造，具有在极端条件下提高耐用性的潜力。在此，报道了薄膜形式的混合等离子体超材料的自组装生长，其中外延银纳米柱嵌入TiN（一种机械强度高且化学惰性的基质）中。关键成就之一在于成功控制银纳米柱的倾斜角度（从0°到50°），这归因于沉积过程中生长动力学和热力学之间的相互作用。 TiN 基体中倾斜的银纳米柱所提供的这种各向异性对于实现宽带、不对称光学选择性至关重要。光谱与数值模拟相结合证明了强等离激元共振，以及在宽广的紫外-可见光到近红外范围内的角度选择性。这项工作中的纳米结构超材料由耐用氮化物基质中的高导电金属纳米柱组成，有潜力作为一种新型混合材料平台，用于高度可定制的纳米级超材料设计，适用于高温光学应用。
Key challenges limiting the adoption of metallic plasmonic nanostructures for practical devices include structural stability and the ease of large‐scale fabrication. Overcoming these issues may require novel metamaterial fabrication with potentials for improved durability under extreme conditions. Here, a self‐assembled growth of a hybrid plasmonic metamaterial in thin‐film form is reported, with epitaxial Ag nanopillars embedded in TiN, a mechanically strong and chemically inert matrix. One of the key achievements lies in the successful control of the tilt angle of the Ag nanopillars (from 0° to 50°), which is attributed to the interplay between the growth kinetics and thermodynamics during deposition. Such an anisotropic nature offered by the tilted Ag nanopillars in TiN matrix is crucial for achieving broadband, asymmetric optical selectivity. Optical spectra coupled with numerical simulations demonstrate strong plasmonic resonance, as well as angular selectivity in a broad UV–vis to near‐infrared regime. The nanostructured metamaterials in this work, which consist of highly conductive metallic nanopillars in a durable nitride matrix, have the potential to serve as a novel hybrid material platform for highly tailorable nanoscale metamaterial designs, suitable for high temperature optical applications.