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In this work, we investigate the guided mode properties of planar anisotropic aluminum-doped zinc oxide waveguides (air/metamaterial/silicon oxide) at the epsilon-near-zero spectral point. Our calculations predict two fundamentally different propagation regimes for the lowest order guided TM and TE modes over a broad spectral range (400-2000 nm). Our study shows that excitation of the TM guided mode is possible for wavelengths higher than epsilon-near-zero spectral point. However the propagation distance for such a TM mode will strongly depend on the spectral position of the mode’s eigenfrequency. E.g., propagation distance is maximized for eigenfrequencies near epsilon-near-zero point and reduced by an order of magnitude as the eigenfrequency is tuned by ~50 nm.
Skylar Lilledahl,Priscilla Kelly,Shouxun Wang, andLyuba Kuznetsova
"TM and TE optical modes of the planar anisotropic aluminum-doped zinc oxide waveguides at the epsilon-near-zero spectral point", Proc. SPIE 11080, Metamaterials, Metadevices, and Metasystems 2019, 110801X (5 September 2019); https://doi.org/10.1117/12.2528924
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Skylar Lilledahl, Priscilla Kelly, Shouxun Wang, Lyuba Kuznetsova, "TM and TE optical modes of the planar anisotropic aluminum-doped zinc oxide waveguides at the epsilon-near-zero spectral point," Proc. SPIE 11080, Metamaterials, Metadevices, and Metasystems 2019, 110801X (5 September 2019); https://doi.org/10.1117/12.2528924