Ultrafast dynamics of coherent phonons and phonon-polaritons in lithium niobate crystals
| Autor: | Abulikemu, Aizitiaili, Fukuda, Takumi, Hase, Muneaki |
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| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Applied Physics Express Vol. 15, 092005 (2022) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.35848/1882-0786/ac871c |
| Popis: | This study investigates the ultrafast dynamics of coherent phonons and phonon-polaritons in lithium niobate (LiNbO$_{3}$) crystals using reflective pump-probe spectroscopy with 25-fs time resolution. In addition to several coherent optical phonon modes, the electro-optic sampling measurements explored the coexistence of phonon-polariton E-modes near 3.8 and 14.9 THz, which agrees considerably with the theoretical phonon-polariton dispersion curves. We also discovered that a time lag ($\Delta$t $\approx$ 0.2 ps) between the coherent optical phonon and phonon-polariton originates from the coupling time for propagating phonon-polariton. Our findings provide a possible application of LiNbO$_{3}$ for ultrafast electro-optic phonon modulators with bandwidths greater than 10 THz. Comment: 15 pages, 4 figures |
| Databáze: | arXiv |
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