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Authors: R. Van Laer, R. Baets, D. Van Thourhout
Title: Unifying Brillouin scattering and cavity optomechanics
Format: International Journal
Publication date: 5/2016
Journal/Conference/Book: Physical Review A
Editor/Publisher: American Physical Society, 
Volume(Issue): 93(5) p.1-15
DOI: 10.1103/PhysRevA.93.053828
Citations: 55 ( - last update: 7/7/2024)
48 (OpenCitations - last update: 27/6/2024)
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So far, Brillouin scattering and cavity optomechanics have been mostly disconnected branches of research, although both deal with photon-phonon coupling. This begs for the development of a broader theory that contains both fields. Here, we derive the dynamics of optomechanical cavities from that of Brillouin-active waveguides. This explicit transition elucidates the link between phenomena such as Brillouin amplification and electromagnetically induced transparency. It proves that effects familiar from cavity optomechanics all have traveling-wave partners, but not vice versa. We reveal a close connection between two parameters of central importance in these fields: the Brillouin gain coefficient and the zero-point optomechanical coupling rate. This enables comparisons between systems as diverse as ultracold atom clouds, plasmonic Raman cavities, and nanoscale silicon waveguides. In addition, back-of-the-envelope calculations show that unobserved effects, such as photon-assisted amplification of traveling phonons, are now accessible in existing systems. Finally, we formulate both circuit- and cavity-oriented optomechanics in terms of vacuum coupling rates, cooperativities, and gain coefficients, thus reflecting the similarities in the underlying physics.

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