ZnO-AuxCu1−x Alloy and ZnO-AuxAl1−x Alloy Vertically Aligned Nanocomposites for Low-Loss Plasmonic Metamaterials

Molecules

Aleem Siddiqui¹  Zihao He²  Anter El-Azab³  Juanjuan Lu³  Robynne L. Paldi³  Nirali A. Bhatt³  Xinghang Zhang³  Yash Pachaury³  Haiyan Wang³ 

[1] Sandia National Laboratory, Albuquerque, NM 87123, USA;School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA;School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA;

关键词: ZnO;    Au;    vertically aligned nanocomposite;    low loss;    metamaterials;    Cu;   

DOI  :  10.3390/molecules27061785

来源: DOAJ

【 摘 要 】

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_xAl_1−x or Au_xCu_1−x are explored due to their lower losses and higher stability. Optical and microstructural properties were explored. The ZnO-Au_xCu_1−x system demonstrated excellent epitaxial quality and optical properties compared with the ZnO-Au_xAl_1−x system. Both nanocomposite systems demonstrate plasmonic resonance, hyperbolic dispersion, low losses, and epsilon-near-zero permittivity, making them promising candidates towards direct photonic integration.

【 授权许可】

Unknown