|
1
|
Paldi RL, Lu J, Pachaury Y, He Z, Bhatt NA, Zhang X, El-Azab A, Siddiqui A, Wang H. ZnO-Au xCu 1-x Alloy and ZnO-Au xAl 1-x Alloy Vertically Aligned Nanocomposites for Low-Loss Plasmonic Metamaterials. Molecules 2022; 27:1785. [PMID: 35335149 PMCID: PMC8948785 DOI: 10.3390/molecules27061785] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 03/01/2022] [Accepted: 03/03/2022] [Indexed: 11/28/2022] Open
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.
Collapse
Affiliation(s)
- Robynne L. Paldi
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA; (R.L.P.); (J.L.); (Y.P.); (N.A.B.); (X.Z.); (A.E.-A.)
| | - Juanjuan Lu
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA; (R.L.P.); (J.L.); (Y.P.); (N.A.B.); (X.Z.); (A.E.-A.)
| | - Yash Pachaury
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA; (R.L.P.); (J.L.); (Y.P.); (N.A.B.); (X.Z.); (A.E.-A.)
| | - Zihao He
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA;
| | - Nirali A. Bhatt
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA; (R.L.P.); (J.L.); (Y.P.); (N.A.B.); (X.Z.); (A.E.-A.)
| | - Xinghang Zhang
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA; (R.L.P.); (J.L.); (Y.P.); (N.A.B.); (X.Z.); (A.E.-A.)
| | - Anter El-Azab
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA; (R.L.P.); (J.L.); (Y.P.); (N.A.B.); (X.Z.); (A.E.-A.)
| | | | - Haiyan Wang
- School of Materials Engineering, Purdue University, West Lafayette, IN 47907, USA; (R.L.P.); (J.L.); (Y.P.); (N.A.B.); (X.Z.); (A.E.-A.)
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA;
| |
Collapse
|