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Journal Article

Generalized non-reciprocity in an optomechanical circuit via synthetic magnetism and reservoir engineering


Marquardt,  Florian
Marquardt Division, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nürnberg, Inst Theoret Phys, Dept Phys;

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Fang, K., Luo, J., Metelmann, A., Matheny, M. H., Marquardt, F., Clerk, A. A., et al. (2017). Generalized non-reciprocity in an optomechanical circuit via synthetic magnetism and reservoir engineering. NATURE PHYSICS, 13(5), 465-471. doi:10.1038/NPHYS4009.

Cite as: http://hdl.handle.net/21.11116/0000-0000-8043-3
Synthetic magnetism has been used to control charge neutral excitations for applications ranging from classical beam steering to quantum simulation. In optomechanics, radiation-pressure-induced parametric coupling between optical (photon) and mechanical (phonon) excitations may be used to break time-reversal symmetry, providing the prerequisite for synthetic magnetism. Here we design and fabricate a silicon optomechanical circuit with both optical and mechanical connectivity between two optomechanical cavities. Driving the two cavities with phase-correlated laser light results in a synthetic magnetic flux, which, in combination with dissipative coupling to the mechanical bath, leads to non-reciprocal transport of photons with 35 dB of isolation. Additionally, optical pumping with blue-detuned light manifests as a particle non-conserving interaction between photons and phonons, resulting in directional optical amplification of 12 dB in the isolator through-direction. These results suggest the possibility of using optomechanical circuits to create a more general class of non-reciprocal optical devices, and further, to enable new topological phases for both light and sound on a microchip.