Opt Lett. 2018 Aug 1;43(15):3493-3496. doi: 10.1364/OL.43.003493.
Recent advances in design and fabrication of photonic-phononic waveguides have enabled stimulated Brillouin scattering in silicon-based platforms such as underetched silicon waveguides and hybrid waveguides. Due to the sophisticated design and, more importantly, high sensitivity of the Brillouin resonances to geometrical variations in micro- and nano-scale structures, it is necessary to have access to the localized opto-acoustic response along those waveguides to monitor their uniformity and maximize their interaction strength. In this Letter, we design and fabricate photonic-phononic waveguides with a deliberate width variation on a hybrid silicon-chalcogenide photonic chip and confirm the effect of the geometrical variation on the localized Brillouin response using a distributed Brillouin measurement.
近年来，光子-声子波导的设计和制造技术取得了进展，使得受蚀刻硅波导和混合波导等硅基平台中的受激布里渊散射成为可能。由于布里渊共振对微纳尺度结构的几何变化非常敏感，因此需要能够获得沿这些波导的局域光声响应，以监测其均匀性并最大化其相互作用强度。在这封信中，我们设计并制造了具有混合硅-硫属化物光子芯片上故意宽度变化的光子-声子波导，并使用分布式布里渊测量确认了几何变化对局域布里渊响应的影响。
