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Conferences > UP > 1994 > MD > MD.9

Microscopic study of ferroelectrics with ultrashort phonon polaritons

H.J. Bakker, S. Hunsche, and H. Kurz

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Abstract

We investigate the low-frequency dielectric response of the ferroelectrics LiTaO3 and LiNbO3 via the impulsive excitation and phase-sensitive detection of THz phonon polaritons. The low-frequency dielectric response of these crystals is dominated by a ferroelectric mode of Ai symmetry. This mode leads to a strong absorption at 6 THz (200 cm−1) in LiTaO3 and to a strong absorption at 7.5 THz (250 cm−1) in LiNbO3 at room temperature The strength and frequency of this mode strongly change when the temperature is increased towards the ferroelectric phase-transition temperature (890 K for LiTaO3 and 1480 K for LiNbO3).

© 1994 Optical Society of America

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