Anisotropic complex refractive index of β-Ga2O3bulk and epilayer evaluated by terahertz time-domain spectroscopy

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Abstract

Homoepitaxial film and semi-insulating bulk β-Ga2O3 with (001) orientation were studied using terahertz time-domain spectroscopy (THz-TDS) in the frequency region from 0.2 to 3.0 THz parallel to the [100] and [010] directions. The static permittivity of the bulk was determined to be 10.0 and 10.4 along the a-axis and b-axis, respectively, and the refractive index values at 0.2 THz are 3.17 and 3.23 for each axis. The electrical resistivity of the epilayer was extracted with good accuracy by employing the Drude-Lorentz model and without the use of electrical contacts. This noninvasive and contact-free material evaluation through THz-TDS proves to be a powerful tool for probing and obtaining various types of information about β-Ga2O3 materials such as bulk and thin films for the development of β-Ga2O3-based device applications.

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Agulto, V. C., Toya, K., Phan, T. N. K., Mag-Usara, V. K., Li, J., Empizo, M. J. F., … Nakajima, M. (2021). Anisotropic complex refractive index of β-Ga2O3bulk and epilayer evaluated by terahertz time-domain spectroscopy. Applied Physics Letters, 118(4). https://doi.org/10.1063/5.0031531

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