Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA.
Nat Commun. 2017 Jul 7;8:15819. doi: 10.1038/ncomms15819.
Brillouin nonlinearities-which result from coupling between photons and acoustic phonons-are exceedingly weak in conventional nanophotonic silicon waveguides. Only recently have Brillouin interactions been transformed into the strongest and most tailorable nonlinear interactions in silicon using a new class of optomechanical waveguides that control both light and sound. In this paper, we use a multi-mode optomechanical waveguide to create stimulated Brillouin scattering between light-fields guided in distinct spatial modes of an integrated waveguide for the first time. This interaction, termed stimulated inter-modal Brillouin scattering, decouples Stokes and anti-Stokes processes to enable single-sideband amplification and dynamics that permit near-unity power conversion. Using integrated mode multiplexers to address separate optical modes, we show that circulators and narrowband filters are not necessary to separate pump and signal waves. We also demonstrate net optical amplification and Brillouin energy transfer as the basis for flexible on-chip light sources, amplifiers, nonreciprocal devices and signal-processing technologies.
布里渊非线性-源于光子和声子之间的耦合-在传统的纳米光子硅波导中极其微弱。直到最近，人们才使用一种新的类光机械波导，将布里渊相互作用转化为硅中最强和最可调节的非线性相互作用，这种波导可以控制光和声。在本文中，我们首次使用多模光机械波导在集成波导的不同空间模式中引导的光场之间产生受激布里渊散射。这种相互作用称为受激模间布里渊散射，它解耦了斯托克斯和反斯托克斯过程，从而实现了单边带放大和动力学，使功率转换接近 100%。我们使用集成模式复用器来寻址不同的光学模式，表明不需要循环器和窄带滤波器来分离泵浦和信号波。我们还展示了净光放大和布里渊能量转移，作为灵活的片上光源、放大器、非互易器件和信号处理技术的基础。
