研究目的
Investigating the fabrication and optical properties of plasmonic Cu nanostructures embedded in a dielectric ZnO matrix for potential low-loss alternatives in photonic structures and devices.
研究成果
The Cu-ZnO metamaterial presents excellent epitaxial quality for both phases and shows strong absorption feature centered at ~600 nm attributed to the resonant surface plasmon polaritons supported by the Cu nanorods. The material exhibits highly hyperbolic optical properties and opposite signs of the real part of the complex dielectric functions along vertical and horizontal directions, presenting enormous opportunities in nanophotonic structure designs.
研究不足
The challenges in the fabrication and applications of Cu nanostructures due to its easy oxidation issues.
1：Experimental Design and Method Selection:
A one-step thin film growth method was used to fabricate Cu-ZnO hybrid thin films.
2：Sample Selection and Data Sources:
High-purity Cu and ZnO powders were mixed and pressed into a pellet, then sintered at 1200 °C for 6 hours with inflowing Ar. The films were deposited on STO (001) and c-cut sapphire substrates using PLD system with a KrF excimer laser.
3：List of Experimental Equipment and Materials:
FEI Titan G2 80-200 microscope, TEAM
4：5, FEI Talos-200X, UV–visible spectroscopy (Lambda 1050), RC2 spectroscopic ellipsometer (J.A. Woollam Company). Experimental Procedures and Operational Workflow:
The deposition temperature was optimized to be 700 °C, the target-substrate distance was
5：5 cm, and the deposition frequency of 5 Hz. Data Analysis Methods:
The effective refractive index and optical dielectric functions were obtained by fitting the ellipsometry data using different models in the VASE software.
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