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Title: Self-Assembled Epitaxial Au–Oxide Vertically Aligned Nanocomposites for Nanoscale Metamaterials

Metamaterials made of nanoscale inclusions or artificial unit cells exhibit exotic optical properties that do not exist in natural materials. Promising applications, such as super-resolution imaging, cloaking, hyperbolic propagation, and ultrafast phase velocities have been demonstrated based on mostly micrometer-scale metamaterials and few nanoscale metamaterials. To date, most metamaterials are created using costly and tedious fabrication techniques with limited paths toward reliable large-scale fabrication. In this work, we demonstrate the one-step direct growth of self-assembled epitaxial metal–oxide nanocomposites as a drastically different approach to fabricating large-area nanostructured metamaterials. Using pulsed laser deposition, we fabricated nanocomposite films with vertically aligned gold (Au) nanopillars (~20 nm in diameter) embedded in various oxide matrices with high epitaxial quality. Strong, broad absorption features in the measured absorbance spectrum are clear signatures of plasmon resonances of Au nanopillars. By tuning their densities on selected substrates, anisotropic optical properties are demonstrated via angular dependent and polarization resolved reflectivity measurements and reproduced by full-wave simulations and effective medium theory. Our model predicts exotic properties, such as zero permittivity responses and topological transitions. In conclusion, our studies suggest that these self-assembled metal–oxide nanostructures provide an exciting new material platform to control and enhance optical response at nanometer scales.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [1] ;  [6] ;  [1] ;  [1] ;  [6] ;  [6] ;  [7] ;  [7] ;  [8] ;  [9] ;  [3] ;  [2] ;  [10]
  1. Texas A&M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering
  2. Univ. of Texas, Austin, TX (United States). Dept. of Physics and the Center for Complex Quantum Systems
  3. Univ. of Texas, Austin, TX (United States). Dept. of Electrical and Computer Engineering
  4. Texas A&M Univ., College Station, TX (United States). Dept. of Chemistry
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  6. Texas A&M Univ., College Station, TX (United States). Dept. of Electrical and Computer Engineering
  7. Texas A&M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
  8. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)
  9. Texas A&M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering; Texas A&M Univ., College Station, TX (United States). Dept. of Chemistry
  10. Texas A&M Univ., College Station, TX (United States). Dept. of Materials Science and Engineering; Texas A&M Univ., College Station, TX (United States). Dept. of Electrical and Computer Engineering
Publication Date:
Report Number(s):
SAND-2016-12660J
Journal ID: ISSN 1530-6984; 649948
Grant/Contract Number:
AC04-94AL85000; AC02-5CH11231; DMR-0846504; DMR-1306878; W911NF-11-1-0447; N00014-10-1-0942
Type:
Accepted Manuscript
Journal Name:
Nano Letters
Additional Journal Information:
Journal Volume: 16; Journal Issue: 6; Journal ID: ISSN 1530-6984
Publisher:
American Chemical Society
Research Org:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); US Army Research Office (ARO); Welch Foundation; China Scholarship Council (CSC)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE; BaTiO3; gold nanopillar; Nanoscale metamaterial; plasmonic property; self-assembled metamaterial; vertically aligned nanocomposite (VAN)
OSTI Identifier:
1340265