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ZnO-Au<i><sub>x</sub></i>Cu<sub>1−<i>x</i></sub> Alloy and ZnO-Au<i><sub>x</sub></i>Al<sub>1−<i>x</i></sub> Alloy Vertically Aligned Nanocomposites for Low-Loss Plasmonic Metamaterials
oleh: Robynne L. Paldi, Juanjuan Lu, Yash Pachaury, Zihao He, Nirali A. Bhatt, Xinghang Zhang, Anter El-Azab, Aleem Siddiqui, Haiyan Wang
Format: | Article |
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Diterbitkan: | MDPI AG 2022-03-01 |
Deskripsi
Hyperbolic metamaterials are a class of materials exhibiting anisotropic dielectric function owing to the morphology of the nanostructures. In these structures, one direction behaves as a metal, and the orthogonal direction behaves as a dielectric material. Applications include subdiffraction imaging and hyperlenses. However, key limiting factors include energy losses of noble metals and challenging fabrication methods. In this work, self-assembled plasmonic metamaterials consisting of anisotropic nanoalloy pillars embedded into the ZnO matrix are developed using a seed-layer approach. Alloys of Au<i><sub>x</sub></i>Al<sub>1−<i>x</i></sub> or Au<i><sub>x</sub></i>Cu<sub>1−<i>x</i></sub> are explored due to their lower losses and higher stability. Optical and microstructural properties were explored. The ZnO-Au<i><sub>x</sub></i>Cu<sub>1−<i>x</i></sub> system demonstrated excellent epitaxial quality and optical properties compared with the ZnO-Au<i><sub>x</sub></i>Al<sub>1−<i>x</i></sub> system. Both nanocomposite systems demonstrate plasmonic resonance, hyperbolic dispersion, low losses, and epsilon-near-zero permittivity, making them promising candidates towards direct photonic integration.