用于强光声相互作用的反谐振反射声脊波导
Anti-resonant reflecting acoustic rib waveguides for strong opto-acoustic interaction
AI总结：
提出利用反谐振反射声波导（ARRAWs）在常规绝缘体上硅脊波导中限制弹性场，结合传统光学限制，实现了与特殊几何结构相当的高效后向受激布里渊散射增益。
摘要：
很少有已知材料系统能通过全内反射同时引导光场和弹性场。这一自然限制将强光声效应的实现限制在采用特殊材料或复杂波导设计的专用平台上。在此，我们将反谐振反射声波导（ARRAWs）的概念作为该问题的潜在解决方案。ARRAWs通过较低弹性速度包覆层的反谐振，将弹性场限制在高弹性速度纤芯中。我们在常规绝缘体上硅脊波导几何结构中，数值研究了ARRAW导模的出现和色散。将该技术应用于高效后向受激布里渊散射（SBS）问题，我们预测ARRAW引导与传统光限制相结合，可产生与更特殊几何结构相当的布里渊增益。
英文摘要：
Few known material systems can simultaneously guide optical and elastic fields through total internal reflection. This natural limit has restricted the realization of strong optoacoustic effects to highly-specialised and purpose-built platforms which employ either exotic materials, or complex waveguide designs. Here we apply the concept of Anti-Resonant Reflecting Acoustic Waveguides (ARRAWs) as a potential solution to this issue. ARRAWs confine the elastic field to a high-elastic-velocity core via the anti-resonances of a cladding layer of lower elastic velocity. We numerically study the appearance and dispersion of ARRAW-guided modes in a conventional silicon-on-insulator rib waveguide geometry. Applying the technique to the problem of efficient backwards Stimulated Brillouin Scattering (SBS), we predict that ARRAW guidance, in conjunction with conventional optical confinement, can produce Brillouin gains comparable to those of more exotic geometries.
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