Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 109, Issue 23, Pages 8834-8838Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1121517109
Keywords
transparent conducting oxides; heavily doped semiconductors; low-loss metals
Categories
Funding
- Office of Naval Research [N00014-10-1-0942]
- Army Research Office [W911NF-04-1-0350, 50342-PH-MUR, W911NF-11-1-0359]
- Air Force Office of Scientific Research [FA9550-10-1-0264]
- National Science Foundation [DMR-1120923]
- Air Force Research Laboratory-Materials and Manufacturing Directorate
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Noble metals such as gold and silver are conventionally used as the primary plasmonic building blocks of optical metamaterials. Making subwavelength-scale structural elements from these metals not only seriously limits the optical performance of a device due to high absorption, it also substantially complicates the manufacturing process of nearly all metamaterial devices in the optical wavelength range. As an alternative to noble metals, we propose to use heavily doped oxide semiconductors that offer both functional and fabrication advantages in the near-infrared wavelength range. In this letter, we replace a metal with aluminum-doped zinc oxide as a new plasmonic material and experimentally demonstrate negative refraction in an Al:ZnO/ZnO metamaterial in the near-infrared range.
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