Terahertz Time Domain Spectroscopy of Phonon-Polaritons in Ferroelectric Lithium Niobate Crystals

Kojima, Seiji; Tsumura, Naoki; Kitahara, Hideaki; Takeda, Mitsuo; Nishizawa, Seizi

doi:10.1143/jjap.41.7033

Cited by 35 publications

(25 citation statements)

References 6 publications

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“…[14]. THz-TDS study of LiTaO 3 shows the evidence of the relaxational mode, but those of CLN [7] and SLN do not show any evidence within experimental uncertainty. Further study for the extension to high frequency range is in progress.…”

Section: Complex Phonon-polariton Dispersionmentioning

confidence: 87%

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Complex dispersion relation of phonon‐polariton in stoichiometric LiNbO ₃

Kojima

Kitahara

Nishizawa

et al. 2004

phys. stat. sol. (c)

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Complex polariton dispersion relations were studied in the nearly stoichiometric lithium niobate crystals grown by the double crucible Czochralski method using the terahertz (THz) time domain spectroscopy. The intensity and phase delay of transmitted THz radiation have been accurately measured for the propagation along the x-axis from 0.1 to 2.3 THz. The dispersion relation of phonon-polariton frequency and damping factor have been determined for A 1 (z) and E(x,y) symmetry polaritons.

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Section: Complex Phonon-polariton Dispersionmentioning

confidence: 87%

“…At first, for a photonic crystal, the phase delay as a function of radiation frequency was measured to determine the dispersion curves of electromagnetic waves related to the photonic band structure [6]. Secondly, the dispersion relation of bulk phonon-polariton frequency has been reported in a few ferroelectric crystals [4,7,8].…”

Section: Introductionmentioning

confidence: 99%

Complex dispersion relation of phonon‐polariton in stoichiometric LiNbO ₃

Kojima

Kitahara

Nishizawa

et al. 2004

phys. stat. sol. (c)

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“…As to the THz study of lithium niobate (LN), such an excess part does not appear. 18,19) However, the T c ¼ 1418 K is much higher than that of LT, and the relaxational response can be quite small.…”

Section: Complex Dielectric Constant Along the Z-axismentioning

confidence: 99%

Dielectric Properties of Ferroelectric Lithium Tantalate Crystals Studied by Terahertz Time-Domain Spectroscopy

Kojima

Kitahara

Nishizawa³

et al. 2003

Jpn. J. Appl. Phys.

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The terahertz (THz) dynamics of ferroelectric lithium tantalate crystals has been investigated using the latest THz timedomain spectroscopy. The intensity and phase shift of transmitted THz radiation have been accurately measured for the propagation of the THz radiation along the y-axis down to 3 cm À1 (0.1 THz). The phonon-polariton dispersion relations have been determined from the phase shift for A 1 (z) and E(x; y) symmetry polaritons. The dispersion relations of both symmetries show no ''avoided crossing'' below 60 cm À1 (1.8 THz). The complex dielectric constants " z (!) and " x (!) in the sub-THz to THz regions have also been determined as functions of frequency. Both the real and imaginary parts of " x (!) are well reproduced using a single damped harmonic oscillator model. However, those of " z (!) indicate the excess part, which may be attributed to a relaxation process related to the order-disorder nature of ferroelectricity.

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“…By employing this technique, it is possible to calculate both absorption coefficient and the refractive index directly without using the Kramers-Kronig relation, which is one of the most important advantages offered by THz-TDS compared with traditional Fourier-transform infrared spectroscopy [9,10]. White et al [11] applied THz-TDS to the non-destructive evaluation (NDE) of yttria-stabilised zirconia (YSZ) coatings by imaging the thickness distribution and suggested that THz-TDS may potentially be used for the NDE of TBCs.…”

Section: Introductionmentioning

confidence: 99%