Proceedings Article | 9 September 2019
KEYWORDS: Plasmonics, Ultraviolet radiation, Visible radiation, Lithium, Sun, Metals, Semiconductors, Aluminum, Titanium, Sapphire
The development of plasmonic metasurface-based optical structures requires alternative, high-performance plasmonic materials, in replacement of commonly used noble metals. Ideally, plasmonic materials should have the properties of low-cost, low-loss, high chemical, mechanical, and thermal stabilities, biocompatibility, spectral tunability, as well as integrability with existing semiconductor technologies. Recently, we have developed epitaxial growth techniques for forming smooth, single-crystalline aluminum and titanium nitride films on transparent sapphire substrates using nitrogen-plasma-assisted molecular-beam epitaxy. In comparison to silver and gold, aluminum- and titanium-nitride-based plasmonics have better stabilities and spectral responses in the ultraviolet and visible spectral regions, making them particular suitable for ultraviolet surface-enhanced surface Raman spectroscopy (UV-SERS), optical energy harvesting, and metamaterial-based linear and nonlinear optics. In this talk, I will present our recent experimental results in these areas.
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