Deep Ultraviolet Optical Anisotropy of β‑Gallium Oxide Thin Films

β-Crystalline phase gallium oxide (β-Ga2O3) is an ultrawide bandgap material with prospective applications in electronics and deep ultraviolet (DUV) optoelectronics and optics. The monoclinic crystal structure of β-Ga2O3 results in optical anisotropy to incident light with different polarization sta...

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Bibliographic Details
Published inACS omega Vol. 9; no. 26; pp. 27963 - 27968
Main Authors Ho, Yu-Che, Ye, Gaihua, Nnokwe, Cynthia, Kuryatkov, Vladimir, Warzywoda, Juliusz, Grave de Peralta, Luis, He, Rui, Bernussi, Ayrton
Format Journal Article
LanguageEnglish
Published American Chemical Society 02.07.2024
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Summary:β-Crystalline phase gallium oxide (β-Ga2O3) is an ultrawide bandgap material with prospective applications in electronics and deep ultraviolet (DUV) optoelectronics and optics. The monoclinic crystal structure of β-Ga2O3 results in optical anisotropy to incident light with different polarization states. This attribute can lead to different optical applications in the DUV. In this article, we investigated the optical properties of β-Ga2O3 thin films grown by pulsed laser deposition technique on sapphire substrates with different crystallographic orientations. Marked in-plane polarization anisotropy, determined by reflectance and Raman spectroscopy, was observed for β-Ga2O3 films deposited on an r-cut sapphire substrate. In contrast, isotropic optical properties were observed in β-Ga2O3 films deposited on a c-cut sapphire substrate.
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ISSN:2470-1343
2470-1343
DOI:10.1021/acsomega.3c10280