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2017 ; 8
(1
): 574
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A chip-integrated coherent photonic-phononic memory
#MMPMID28924261
Merklein M
; Stiller B
; Vu K
; Madden SJ
; Eggleton BJ
Nat Commun
2017[Sep]; 8
(1
): 574
PMID28924261
show ga
Controlling and manipulating quanta of coherent acoustic vibrations-phonons-in
integrated circuits has recently drawn a lot of attention, since phonons can
function as unique links between radiofrequency and optical signals, allow access
to quantum regimes and offer advanced signal processing capabilities. Recent
approaches based on optomechanical resonators have achieved impressive quality
factors allowing for storage of optical signals. However, so far these techniques
have been limited in bandwidth and are incompatible with multi-wavelength
operation. In this work, we experimentally demonstrate a coherent buffer in an
integrated planar optical waveguide by transferring the optical information
coherently to an acoustic hypersound wave. Optical information is extracted using
the reverse process. These hypersound phonons have similar wavelengths as the
optical photons but travel at five orders of magnitude lower velocity. We
demonstrate the storage of phase and amplitude of optical information with
gigahertz bandwidth and show operation at separate wavelengths with negligible
cross-talk.Optical storage implementations based on optomechanical resonator are
limited to one wavelength. Here, exploiting stimulated Brillouin scattering, the
authors demonstrate a coherent optical memory based on a planar integrated
waveguide, which can operate at different wavelengths without cross-talk.