Broadband Terahertz Spectroscopy of Phonon-Polariton Dispersion in Ferroelectrics
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...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-12-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/5/4/55 |