Abstract
Tunable directional scattering is of paramount importance for operation of antennas, routing of light, and design of topologically protected optical states. For visible light scattered on a nanoparticle, the directionality could be provided by the Kerker effect, exploiting the interference of electric and magnetic dipole emission patterns. However, magnetic optical resonances in small sub-100-nm particles are relativistically weak. Here, we predict inelastic scattering with the unexpectedly strong tunable directivity up to 5.25 driven by a trembling of a small particle without any magnetic resonance. The proposed optomechanical Kerker effect originates from the vibration-induced multipole conversion. We also put forward an optomechanical spin-Hall effect, the inelastic polarization-dependent directional scattering. Our results uncover an intrinsically multipolar nature of the interaction between light and mechanical motion and apply to a variety of systems from cold atoms to two-dimensional materials to superconducting qubits. An application for engineering of chiral optomechanical coupling and nonreciprocal transmission at nanoscale is proposed.3 MoreReceived 6 August 2018Revised 15 November 2018DOI:https://doi.org/10.1103/PhysRevX.9.011008Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasMechanical effects of light on material mediaMetamaterialsNanophotonicsOptomechanicsPhysical SystemsNanomechanical devicesNanoparticlesCondensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical
Highlights
Scattering of light manifests itself in everyday life, fundamental science, and device applications [1]
For visible light scattered on a nanoparticle, the directionality could be provided by the Kerker effect, exploiting the interference of electric and magnetic dipole emission patterns
The Doppler effect leads to a difference between the incident and scattered light frequencies [4], which depends on the scattering angle in a highly asymmetric way
Summary
Scattering of light manifests itself in everyday life, fundamental science, and device applications [1]. The ability to control the direction, frequency, and polarization of the scattered light is essential for optical devices. Both Rayleigh and Raman scattering usually have a symmetric emission pattern: the waves are symmetrically scattered in two opposite directions, in particular, forward and backward [2,3]. We put forward an optomechanical Kerker effect, where strong tunable directionality is achieved for light scattered by a small particle without any magnetic response that trembles in space. We put forward an optomechanical spin-Hall effect, i.e., directional inelastic scattering of light depending on its circular polarization. An application of the uncovered effects for design of chiral optomechanical coupling at nanoscale and nonreciprocal transmission is proposed
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