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

Authors :
Robynne L. Paldi
Juanjuan Lu
Yash Pachaury
Zihao He
Nirali A. Bhatt
Xinghang Zhang
Anter El-Azab
Aleem Siddiqui
Haiyan Wang
Source :
Molecules, Vol 27, Iss 6, p 1785 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

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 AuxAl1−x or AuxCu1−x are explored due to their lower losses and higher stability. Optical and microstructural properties were explored. The ZnO-AuxCu1−x system demonstrated excellent epitaxial quality and optical properties compared with the ZnO-AuxAl1−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.

Details

Language :
English
ISSN :
14203049
Volume :
27
Issue :
6
Database :
Directory of Open Access Journals
Journal :
Molecules
Publication Type :
Academic Journal
Accession number :
edsdoj.b63259bb6e94cceba20a7349def23c9
Document Type :
article
Full Text :
https://doi.org/10.3390/molecules27061785