Optomechanically induced non-reciprocity in microring resonators

Joint Quantum Institute, NIST/University of Maryland, College Park, MD 20742, USA.
Optics Express (Impact Factor: 3.49). 03/2012; 20(7):7672-84. DOI: 10.1364/OE.20.007672
Source: PubMed


We describe a new approach for on-chip optical non-reciprocity which makes use of strong optomechanical interaction in microring resonators. By optically pumping the ring resonator in one direction, the optomechanical coupling is only enhanced in that direction, and consequently, the system exhibits a non-reciprocal response. For different configurations, this system can function either as an optical isolator or a coherent non-reciprocal phase shifter. We show that the operation of such a device on the level of single-photon could be achieved with existing technology.

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    • "We note that the scheme also works for driving far away from the red sideband (yielding enhanced values of Ω and thereby J eff ; see below), though that requires stronger driving. Another optomechanical scheme for non-reciprocal photon transport that could potentially be extended to a lattice is based on optical microring resonators [23], but the connection of these rather large rings via waveguides would presumably result in a more complicated and less compact structure than what can be done with the photonic-crystal based approaches analyzed here. We now discuss the limitations imposed on the achievable effective hopping J eff . "
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