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Photonics 2018, 5(4), 55; https://doi.org/10.3390/photonics5040055

Broadband Terahertz Spectroscopy of Phonon-Polariton Dispersion in Ferroelectrics

Division of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
Received: 7 November 2018 / Revised: 28 November 2018 / Accepted: 28 November 2018 / Published: 3 December 2018
(This article belongs to the Special Issue Terahertz Photonics)
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Abstract

Electromagnetic waves at frequencies below the X-ray region strongly couple to the optical vibrational modes in a solid. These coupled excitations have been called phonon polaritons. The relationship of the polariton frequency versus the polariton wavevector shows a remarkable dispersion, especially in the vicinity of the transverse and longitudinal optical mode frequencies. The significant frequency dependence enables valuable applications such as a tunable terahertz radiation source. The polariton dispersion relations of technologically important dielectric and ferroelectric crystals were reviewed in the broad terahertz range using terahertz time-domain spectroscopy, far-infrared spectroscopy, and Raman scattering spectroscopy. View Full-Text
Keywords: phonon polariton; terahertz; spectroscopy; ferroelectrics phonon polariton; terahertz; spectroscopy; ferroelectrics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Kojima, S. Broadband Terahertz Spectroscopy of Phonon-Polariton Dispersion in Ferroelectrics. Photonics 2018, 5, 55.

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