Journal
ACS OMEGA
Volume 5, Issue 5, Pages 2234-2241Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.9b03356
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0020077]
- Purdue Doctoral Fellow program
- U.S. National Science Foundation [DMR-1565822]
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Hyperbolic metamaterials demonstrate exotic optical properties that are poised to find applications in subdiffi-action imaging and hyperlenses. Key challenges remain for practical applications, such as high energy losses and lack of hyperbolic properties in shorter wavelengths. In this work, a new oxide-metal (ZnO-Au) hybrid-material system in the vertically aligned nanocomposite thin-film form has been demonstrated with very promising in-plane two-phase ordering using a one-step growth method. Au nanopillars grow epitaxially in the ZnO matrix, and the pillar morphology, orientation, and quasi-hexagonal in-plane ordering are found to be effectively tuned by the growth parameters. Strong surface plasmon resonance has been observed in the hybrid system in the UV-vis range, and highly anisotropic dielectric properties have resulted with much broader and tunable hyperbolic wavelength regimes. The observed strain-driven two-phase in-plane ordering and its novel tunable hyperbolic metamaterial properties all demonstrate strong potential for future oxide-metal hybrid-material design toward future integrated hybrid photonics.
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