Mr. Changkee Hong Profile

Changkee Hong

at CREOL, The College of Optics and Photonics

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Proceedings Article | 26 February 2020 Paper

Biaxial hyperbolic metamaterials

Changkee Hong, Azad Siahmakoun, Hossein Alisafaee

Proceedings Volume 11289, 1128929 (2020) https://doi.org/10.1117/12.2546919

KEYWORDS: Metamaterials, Spectroscopic ellipsometry, Birefringence

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We have fabricated biaxial hyperbolic metamaterials (BHMMs) using layered structures consisting of titanium dioxide (TiO₂) and copper (Cu). In order to enable the biaxial property, an oblique angle deposition (OAD) technique is applied to deposit the dielectric layer. We have characterized the biaxial hyperbolic dispersion using variable angle spectroscopic ellipsometry (VASE) measurements in the wavelength range 400 nm to 900 nm. A noticeable difference be- tween in-plane permittivity components of the fabricated BHMM is observed to be 0.13 at 633 nm. The experimental characterization results have been in good agreement with the predictions of effective medium approximation (EMA) with an MSE of 18.

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