NDLI: Complex extraordinary dielectric function of Mg-doped lithium niobate crystals at terahertz frequencies

Content Provider	Springer Nature Link
Author	Kuznetsov, K. A. Kitaeva, G. Kh. Kovalev, S. P. Germansky, S. A. Buryakov, A. M. Tuchak, A. N. Penin, A. N.
Copyright Year	2016
Abstract	We study the dispersion of the extraordinary dielectric function real and imaginary parts in the wide terahertz-frequency range of the lowest polariton branch for bulk LiNbO3 and Mg:LiNbO3 crystals. At frequencies 0.1–2.5 THz, both dispersion parts are measured by means of standard time-domain terahertz spectroscopy, and at higher frequencies up to 5.5 THz, the dielectric function real part is determined using a common scheme of spontaneous parametric down-conversion under near-forward Raman scattering by phonon polaritons. A special approach is applied for measuring of the dielectric function imaginary part at frequencies 1–3 THz, based on the analysis of visibility of three-wave second-order interference under spontaneous parametric down-conversion. The generalized approximate expressions are obtained for complex dielectric function dispersion within the lower polariton branches of LiNbO3 and Mg:LiNbO3. It is shown that the well-known decrease in terahertz-wave absorption of lithium niobate crystals under Mg-doping is caused by changes in the defect structure and reduction of coupling of the terahertz-frequency polaritons with Debye relaxational mode.
Starting Page	1
Ending Page	9
Page Count	9
File Format	PDF
ISSN	09462171
Journal	Applied Physics B
Volume Number	122
Issue Number	8
e-ISSN	14320649
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-08-01
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Physics Physical Chemistry Laser Technology, Photonics Quantum Optics Optics, Optoelectronics, Plasmonics and Optical Devices Engineering
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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