Optomechanically induced non-reciprocity in microring resonators

Joint Quantum Institute, NIST/University of Maryland, College Park, MD 20742, USA.
Optics Express (Impact Factor: 3.53). 03/2012; 20(7):7672-84. DOI: 10.1364/OE.20.007672
Source: PubMed

ABSTRACT 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.


Available from: Mohammad Hafezi, Apr 16, 2015
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We propose using the optomechanical interaction to create artificial magnetic fields for photons on a lattice. The ingredients required are an optomechanical crystal, i.e. a piece of dielectric with the right pattern of holes, and two laser beams with the right pattern of phases. One of the two proposed schemes is based on optomechanical modulation of the links between optical modes, while the other is an lattice extension of optomechanical wavelength-conversion setups. We illustrate the resulting optical spectrum, photon transport in the presence of an artificial Lorentz force, edge states, and the photonic Aharonov-Bohm effect. Moreover, wWe also briefly describe the gauge fields acting on the synthetic dimension related to the phonon/photon degree of freedom. These can be generated using a single laser beam impinging on an optomechanical array.
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: We propose an all-optical integrated nonreciprocal device on the optomechanical platform with a large nonreciprocal bandwidth and low operating power. The device is based on an asymmetric silicon coupler consisting of two branches. One of them is a conventional strip waveguide fixed on the substrate, and the other is a freestanding nanostring suspended above a groove in the substrate. When light is launched into the coupler, the optical gradient force between the freestanding nanostring and the underlying substrate leads to the deflection of the nanostring, and finally results in destruction of the initial phase-matching condition between the two branches. The suspended branch would achieve distinct deflections when light is incident from different ports. The simulation results show a nonreciprocal bandwidth of 13.1 nm with operating power of 390 mW. With the advantages of simple structure, low power consumption and large operating bandwidth, our work provides a promising solution for on-chip passive nonreciprocal device.
    Scientific Reports 03/2015; 5:8657. DOI:10.1038/srep08657 · 5.08 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: We present the concept and practical design of nonreciprocal optical nanodevices that do not require magnetic materials or bias, but instead are based on a fully integrated nanophotonic ring resonator spatiotemporally modulated to impart angular momentum bias that, according to the Onsager–Casimir principle, can break time-reversal symmetry. On the basis of this idea, we discuss optimal designs for compact optical isolators exhibiting arbitrarily large isolation and low transmission loss, achieved by properly selecting the quality factor of the nanoring, the amount of angular momentum bias, and the gaps between ring and channel/drop waveguides. A practical implementation based on stepwise modulation and pin junctions is explored, showing strong nonreciprocal response in a simple, integrated design. These findings can enable the realization of on-chip, fully integrable nonreciprocal optical nanocomponents as a new paradigm in all-optical communication systems.
    02/2014; 1(3):198–204. DOI:10.1021/ph400058y