Terahertz permittivity parameters of monoclinic single crystal lutetium oxyorthosilicate

Authors

Sean Knight, Linköping University, Lund University
Steffen Richter, Linköping University, Lund University
Alexis Papamichail, Linköping University
Megan Stokey, University of Nebraska-Lincoln
Rafał Korlacki, University of Nebraska-Lincoln
Vallery Stanishev, Linköping University
Philipp Kühne, Linköping University
Mathias Schubert, Lund University, University of Nebraska-LincolnFollow
Vanya Darakchieva, Linköping University, Lund University

Document Type

Article

Date of this Version

12-15-2023

Citation

Appl. Phys. Lett. 124, 032101 (2024); doi: 10.1063/5.0177304

Comments

CC BY

Abstract

The anisotropic permittivity parameters of monoclinic single crystal lutetium oxyorthosilicate, Lu₂SiO₅ (LSO), have been determined in the terahertz spectral range. Using terahertz generalized spectroscopic ellipsometry (THz-GSE), we obtained the THz permittivities along the a, b, and c^⋆ crystal directions, which correspond to the ε_a; ε_b, and ε_c? on-diagonal tensor elements. The associated off diagonal tensor element ε_ac? was also determined experimentally, which is required to describe LSO’s optical response in the monoclinic a–c crystallographic plane. From the four tensor elements obtained in the model fit, we calculate the direction of the principal dielectric axes in the a–c plane.We find good agreementwhen comparing THz-GSE permittivities to the static permittivity tensors from previous infrared and density functional theory studies.