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- W2810412348 abstract "Coupling between optical phonons and light leads to the formation of phonon polaritons, resulting in important changes to the material dispersion. Commonly, the phonon-polariton dispersion curve has been determined by transient-grating impulsive stimulated Raman-scattering measurements, but reported results for the prototypical dispersion curve of $mathrm{LiNb}{mathrm{O}}_{3}$ have led to some controversy. We present a procedure to measure the phonon-polariton dispersion curve by varying the pump wavelength with fixed probe wavelength that allows measurement over a broad range of wave vectors. We determine the lowest-frequency $E$-mode phonon-polariton dispersion curve for $mathrm{LiNb}{mathrm{O}}_{3}$ with measured wave vectors ranging from $1ifmmodetimeselsetexttimesfi{}{10}^{3}phantom{rule{0.16em}{0ex}}mathrm{c}{mathrm{m}}^{ensuremath{-}1}$ to $19ifmmodetimeselsetexttimesfi{}{10}^{3}phantom{rule{0.16em}{0ex}}mathrm{c}{mathrm{m}}^{ensuremath{-}1}$, which is the broadest known optically measured phonon-polariton dispersion curve for $mathrm{LiNb}{mathrm{O}}_{3}$. The broad range offers improved understanding of the extracted material parameters. We also note some challenges that occur in interpreting the data at short pump wavelengths; these effects help explain controversial differences between previous transient-grating measurements of $mathrm{LiNb}{mathrm{O}}_{3}$ dispersion curves." @default.
- W2810412348 created "2018-07-10" @default.
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- W2810412348 date "2018-06-26" @default.
- W2810412348 modified "2023-09-26" @default.
- W2810412348 title "Measurement of a phonon-polariton dispersion curve by varying the excitation wavelength" @default.
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- W2810412348 doi "https://doi.org/10.1103/physrevb.97.214307" @default.
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