Megan Stokey, Ph.D.
Assistant Professor
- Milwaukee WI UNITED STATES
- Electrical Engineering and Computer Science
Dr. Megan Stokey is an assistant professor in the Electrical Engineering and Computer Science Department at MSOE.
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Education, Licensure and Certification
Ph.D.
Electrical Engineering
University of Nebraska-Lincoln
2023
B.S.
Electrical Engineering
University of Nebraska-Lincoln
2019
Biography
Areas of Expertise
Accomplishments
J.A. Woollam Best Student Paper Award
2022
Milton Mohr Fellowship
2020-2022
Graham Engineering Fellowship
2022
Halla Fellowship
2019
Holling Fellowship
2019
Affiliations
- Applied Physics Letters : Peer Reviewer
- Graduate Student Assembly Department Representative
Social
Selected Publications
Anisotropic dielectric function, direction dependent bandgap energy, band order, and indirect to direct gap crossover in α-(AlxGa1−x)2O3 (≤x≤1 )
Applied Physics Letters2022
Mueller matrix spectroscopic ellipsometry is applied to determine anisotropic optical properties for a set of single-crystal rhombohedral structure α-(AlxGa1−x)2O3 thin films (0 ≤ x ≤ 1). Samples are grown by plasma-assisted molecular beam epitaxy on m-plane sapphire. A critical-point model is used to render a spectroscopic model dielectric function tensor and to determine direct electronic band-to-band transition parameters, including the direction dependent two lowest-photon energy band-to-band transitions associated with the anisotropic bandgap.
Elevated temperature spectroscopic ellipsometry analysis of the dielectric function, exciton, band-to-band transition, and high-frequency dielectric constant properties for single-crystal ZnGa2O4
Applied Physics Letters2022
We report the elevated temperature (22 °C ≤ T ≤ 600 °C) dielectric function properties of melt grown single crystal ZnGa2O4 using a spectroscopic ellipsometry approach. A temperature dependent Cauchy dispersion analysis was applied across the transparent spectrum to determine the high-frequency index of refraction yielding a temperature dependent slope of 3.885(2) × 10−5 K−1.
Infrared active phonons in monoclinic lutetium oxyorthosilicate
Journal of Applied Physics2020
A combined generalized spectroscopic ellipsometry measurement and density functional theory calculation analysis is performed to obtain the complete set of infrared active phonon modes in Lu2SiO5 with a monoclinic crystal structure. Two different crystals, each cut perpendicular to a different crystal axis, are investigated.
Lattice dynamics of orthorhombic NdGaO3
Physical Review B2019
A complete set of infrared-active and Raman-active lattice modes is obtained from density functional theory calculations for single-crystalline centrosymmetric orthorhombic neodymium gallate. The results for infrared-active modes are compared with an analysis of the anisotropic long-wavelength properties using generalized spectroscopic ellipsometry. The frequency-dependent dielectric function tensor and dielectric loss function tensor of orthorhombic neodymium gallium oxide are reported in the spectral range of 80–1200 cm −1.
Terahertz electron paramagnetic resonance generalized spectroscopic ellipsometry: The magnetic response of the nitrogen defect in 4H-SiC
Applied Physics Letters2022
We report on terahertz (THz) electron paramagnetic resonance generalized spectroscopic ellipsometry (THz-EPR-GSE). Measurements of field and frequency dependencies of magnetic response due to spin transitions associated with nitrogen defects in 4H-SiC are shown as an example. THz-EPR-GSE dispenses with the need of a cavity, permits independently scanning field and frequency parameters, and does not require field or frequency modulation.
