Terahertz Time-Domain Spectroscopy of Dielectric Response in LiNbO₃

S. KOJIMA Institute of Materials Science University of Tsukuba, Tsukuba, Ibaraki, Japan, 305-8573

H. KITAHARA Department of Physics Faculty of Science, Shinshu University Matsumoto, Nagano, Japan, 390-8621

S. NISHIZAWA Research Center for Development of Far-Infrared Region Fukui University, Fukui, Japan, 910-8507

M. WADA TAKEDA Department of Physics Faculty of Science, Shinshu University Matsumoto, Nagano, Japan, 390-8621

Abstract

Terahertz (THz) dielectric responce of lithium niobate crystals has been studied by THz Time-Domain Spectroscopy. The complex dielectric constants ε_z(ω) and ε_y(ω) have been determined from 0.1 THz to 2.0 THz without the Kramers-Kronig Analysis. The dispersion relations of A₁(z) and E(y) symmetry phonon-polaritons have been determined accurately down to 0.1 THz.

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Terahertz Time-Domain Spectroscopy of Dielectric Response in LiNbO₃

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Terahertz Time-Domain Spectroscopy of Dielectric Response in LiNbO₃