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Title: Broadband terahertz time-domain spectroscopy of ferroelectric LiTaO{sub 3}: Phonon-polariton dispersion

The lowest frequency IR active A{sub 1}(z) and E(x) modes of a ferroelectric congruent lithium tantalate crystal were studied by the broadband polarized Terahertz Time-Domain Spectroscopy using the coherent THz radiation from 0.2 to 6.5 THz. The dispersion relations of the real and imaginary parts of a polariton wave vector were determined from the complex extraordinary and ordinary refractive indices for the A{sub 1}(z) and E(x) symmetry phonon-polaritons, respectively. The observed complex dispersion relations of two symmetries are in agreement within the experimental uncertainty with the calculated dispersion curves by the damped harmonic oscillator model.
Authors:
;  [1]
  1. Division of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573 (Japan)
Publication Date:
OSTI Identifier:
22390535
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1627; Journal Issue: 1; Conference: 14. Electroceramics Conference, Bucharest (Romania), 16-20 Jun 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTALS; DIAGRAMS; DISPERSION RELATIONS; FERROELECTRIC MATERIALS; HARMONIC OSCILLATOR MODELS; HARMONIC OSCILLATORS; LITHIUM COMPOUNDS; PHONONS; POLARONS; REFRACTIVE INDEX; SYMMETRY; TANTALATES; THZ RANGE; VECTORS