@article{oai:tsukuba.repo.nii.ac.jp:00055742,
 author = {小島, 誠治 and KOJIMA, Seiji},
 issue = {4},
 journal = {Photonics},
 month = {Dec},
 note = {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.},
 title = {Broadband Terahertz Spectroscopy of Phonon-Polariton Dispersion in Ferroelectrics},
 volume = {5},
 year = {2018},
 yomi = {コジマ, セイジ}
}