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Huang, Fumin
Queen's University Belfast
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2022Searching for refractory plasmonic materials: the structural and optical properties of Au3Zr intermetallic thin filmscitations
- 2022Optical properties of Au-Hf thin filmscitations
- 2022Elliptical plasmonic near-field transducer and v-shape waveguide designs for heat assisted magnetic recording
- 2019The optical properties of AuZr intermetallic alloys
- 2018Mechanism of Gold-Assisted Exfoliation of Centimeter-Sized Transition-Metal Dichalcogenide Monolayerscitations
- 2017Near-Field Raman Enhancement of Single Molecules and Point Scattererscitations
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article
Optical properties of Au-Hf thin films
Abstract
The optical properties of thin films of intermetallic Au<sub>3</sub>Hf were experimentally investigated for the first time, which display significant negative ε′ in the visible and near infrared regions, hence are clearly plasmonic materials. In contrast to similar alloys, such as films of Au<sub>3</sub>Zr, the films express more negative ε′ values and lower ε″ values across most of the wavelengths (370–1570 nm) investigated. The Au<sub>3</sub>Hf films were fabricated by DC magnetron sputtering at a range of deposition temperatures, from room temperature to 415 °C, and annealed at different vacuum levels. The films mostly formed as a combination of Au<sub>3</sub>Hf, Au<sub>2</sub>Hf and Au<sub>4</sub>Hf phases when deposited below 400 °C, and exclusively Au<sub>3</sub>Hf phase at above 400 °C, indicating key conditions for isolating this phase. The films were stable when annealed at 10<sup>−8</sup> Torr, but when annealed again at 10<sup>−6</sup> Torr the films oxidised and changed into a mix of Au-Hf phases, suggesting resistance to oxidization may be an issue for unencapsulated applications at elevated temperatures.<br/><br/><br/>