Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 6, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4928480
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Funding
- Japan Society for the Promotion of Science [23241034, 25800177, 26107517, 15K13273]
- Ministry of Education, Culture, Sports, Science, and Technology
- Grants-in-Aid for Scientific Research [26107517, 15K13273, 25800177, 15K13378] Funding Source: KAKEN
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We demonstrate the real-time observation of phonon-polariton propagation in ferroelectric LiNbO3 using a single-shot spectroscopic setup that employs an echelon mirror. The echelon mirror provides a spatially encoded time delay for the probe pulse; therefore, the ultrafast transient behavior of materials can be detected on a single-shot basis. Using optical Kerr gate apparatus, forward and backward propagating E-mode phonon-polaritons were simultaneously induced via an impulsive stimulated Raman scattering process, and subsequently, their dynamics were readily mapped in time-frequency space using heterodyne detection. The two phonon-polaritons appeared on opposite sides of the central probe wavelength and were symmetrically imaged against the ordinary and extraordinary probe lights. By taking into account coupling of the lowest E-mode phonon-polariton to a low-frequency relaxational mode, not only the phonon-polariton dispersion but also the wavevector dependence of the damping rate was unveiled and quantitatively evaluated. (C) 2015 AIP Publishing LLC.
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