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A chip-integrated coherent photonic-phononic memory.

Moritz Merklein1,2, Birgit Stiller3,4, Khu Vu5

  • 1Centre for Ultrahigh Bandwidth Devices for Optical Systems (CUDOS), Institute of Photonics and Optical Science (IPOS), School of Physics, University of Sydney, Sydney, NSW, 2006, Australia. moritz.merklein@sydney.edu.au.

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Summary
This summary is machine-generated.

Researchers developed a new coherent optical memory using integrated waveguides. This technology stores optical information as acoustic hypersound waves, enabling gigahertz bandwidth and multi-wavelength operation without cross-talk.

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Area of Science:

  • Quantum acoustics
  • Integrated photonics
  • Solid-state physics

Background:

  • Phonons (quanta of acoustic vibrations) are explored for integrated circuits, linking radiofrequency and optical signals.
  • Optomechanical resonators offer high quality factors for optical signal storage but are limited in bandwidth and multi-wavelength compatibility.

Purpose of the Study:

  • To demonstrate a coherent buffer in an integrated planar optical waveguide for storing optical information as acoustic hypersound waves.
  • To overcome bandwidth and multi-wavelength limitations of existing optomechanical resonator-based optical storage.

Main Methods:

  • Transferring optical information coherently to a hypersound wave within an integrated planar optical waveguide.
  • Utilizing stimulated Brillouin scattering for coherent information transfer and retrieval.
  • Extracting optical information via the reverse process of coherent transfer.

Main Results:

  • Demonstrated storage of optical information's phase and amplitude with gigahertz bandwidth.
  • Achieved operation at separate wavelengths with negligible cross-talk, overcoming a key limitation of resonator-based systems.
  • Hypersound phonons with similar wavelengths but significantly lower velocity than optical photons were utilized.

Conclusions:

  • The developed integrated waveguide system provides a novel approach for coherent optical memory.
  • This technology enables high-bandwidth, multi-wavelength optical information storage with potential applications in quantum information processing and optical signal processing.