Reference : Ultrafast acousto-optic mode conversion in optically birefringent ferroelectrics
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Physics and Materials Science
Ultrafast acousto-optic mode conversion in optically birefringent ferroelectrics
Lejman, Mariusz [> >]
Vaudel, Gwenaelle [> >]
Infante, Ingrid C. [> >]
Ievgeniia, Chaban [> >]
Pezeril, Thomas [> >]
Edely, Mathieu [> >]
Nataf, Guillaume F. [> >]
Guennou, Mael mailto [University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit]
Kreisel, Jens mailto [University of Luxembourg > Rectorate >]
Gusev, Vitalyi E. [> >]
Brahim, Dkhil [> >]
Ruello, Pascal [> >]
Nature Communications
2041-1723 Infante, Ingrid/D-4450-2014 Nataf, Guillaume F./J-2175-2019 Dkhil, Brahim/O-8939-2014 Infante, Ingrid/0000-0003-3929-6614 Nataf, Guillaume F./0000-0001-9215-4717 Dkhil, Brahim/0000-0002-9862-625X Ruello, Pascal/0000-0002-5398-1610 ISI:000380859100001
[en] The ability to generate efficient giga-terahertz coherent acoustic phonons with femtosecond laser makes acousto-optics a promising candidate for ultrafast light processing, which faces electronic device limits intrinsic to complementary metal oxide semiconductor technology. Modern acousto-optic devices, including optical mode conversion process between ordinary and extraordinary light waves (and vice versa), remain limited to the megahertz range. Here, using coherent acoustic waves generated at tens of gigahertz frequency by a femtosecond laser pulse we reveal the mode conversion process and show its efficiency in ferroelectric materials such as BiFeO3 and LiNbO3. Further to the experimental evidence, we provide a complete theoretical support to this all-optical ultrafast mechanism mediated by acousto-optic interaction. By allowing the manipulation of light polarization with gigahertz coherent acoustic phonons, our results provide a novel route for the development of next-generation photonic-based devices and highlight new capabilities in using ferroelectrics in modern photonics.

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