Journal
NANO LETTERS
Volume 20, Issue 9, Pages 6614-6622Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02440
Keywords
oxide-nitride heterostructure; hyperbolic metamaterial; titanium nitride; ferromagnetic nanostructure; magrieto-optical coupling Kerr rotation
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Funding
- U.S. National Science Foundation [DMR-1454618]
- Basil R. Turner Professorship at Purdue University
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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Metal-free plasmonic metamaterials with wide-range tunable optical properties are highly desired for various components in future integrated optical devices. Designing a ceramicceramic hybrid metamaterial has been theoretically proposed as a solution to this critical optical material demand. However, the processing of such all-ceramic metamaterials is challenging due to difficulties in integrating two very dissimilar ceramic phases as one hybrid system. In this work, an oxide-nitride hybrid metamaterial combining two highly dissimilar ceramic phases, i.e., semiconducting weak ferromagnetic NiO nanorods and conductive plasmonic TiN matrix, has been successfully integrated as a unique vertically aligned nanocomposite form. Highly anisotropic optical properties such as hyperbolic dispersions and strong magneto-optical coupling have been demonstrated under room temperature. The novel functionalities presented show the strong potentials of this new ceramicceramic hybrid thin film platform and its future applications in next-generation nanophotonics and magneto-optical integrated devices without the lossy metallic components.
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