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Journal Article

Coherently refreshed acoustic phonons for extended light storage


Stiller,  Birgit
Stiller Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Sydney;

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Stiller, B., Merklein, M., Wolff, C., Vu, K., Ma, P., Madden, S. J., et al. (2020). Coherently refreshed acoustic phonons for extended light storage. Optica, 7(5), 492-497. doi:10.1364/OPTICA.386535.

Cite as: https://hdl.handle.net/21.11116/0000-0008-1EE5-5
Acoustic waves can serve as memory for optical information; however, propagating acoustic phonons in the gigahertz (GHz) regime decay on the nanosecond time scale. Usually this is dominated by intrinsic acoustic loss due to inelastic scattering of the acoustic waves and thermal phonons. Here we show a way to counteract the intrinsic acoustic decay
of the phonons in a waveguide by resonantly reinforcing the acoustic wave via synchronized optical pulses. We experimentally demonstrate coherent on-chip storage in amplitude and phase up to 40 ns, 4 times the intrinsic acoustic lifetime in the waveguide. Through theoretical considerations, we anticipate that this concept allows for storage times up to microseconds within realistic experimental limitations while maintaining a GHz bandwidth of the optical signal.