Electromechanical Brillouin scattering in integrated optomechanical waveguides
Electromechanical Brillouin scattering in integrated optomechanical waveguides
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DOI：
10.1364/optica.6.000778
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发表时间：
2019-06-20
期刊：
影响因子：
10.4
通讯作者：
Li, Mo
中科院分区：
文献类型：
--
作者：
Liu, Qiyu;Li, Huan;Li, Mo
在众所周知的受激布里渊散射（SBS）过程中，材料中的自发声子受到激光的刺激并散射到斯托克斯边带中。SBS在光纤中变得更加明显，并已被用来放大光信号，甚至实现激光。由于波导中光子和声子的同时限制导致相互作用急剧增强，SBS的开发最近在集成光子平台上激增。相干声子也可以用非常高效的机电激发，而不是光激发，就像在射频声滤波器中所利用的那样。在这里，我们证明了由压电材料氮化铝（AlN）制成的集成光机械波导中的机电激发布里渊散射。用纳米制造的机电换能器激发频率为16 GHz的声子，将波导中反向传播的光子散射到单个反斯托克斯边带中。我们证明了布里渊散射的相位匹配条件可以通过改变光波长和声频率来实现可调谐的单边带调制。将布里渊散射光子学与纳米机电系统相结合，我们的方法提供了微波光子和光光子之间的有效接口，这将对微波光子学和潜在的量子转导非常重要。(C) 2019年美国光学学会根据OSA开放获取出版协议的条款
In the well-known stimulated Brillouin scattering (SBS) process, spontaneous acoustic phonons in materials are stimulated by laser light and scatter the latter into a Stokes sideband. SBS becomes more pronounced in optical fibers and has been harnessed to amplify optical signals and even achieve lasing. Exploitation of SBS has recently surged on integrated photonics platforms, as simultaneous confinement of photons and phonons in waveguides leads to drastically enhanced interaction. Instead of being optically stimulated, coherent phonons can also be electromechanically excited with very high efficiency, as has been exploited in radio frequency acoustic filters. Here, we demonstrate electromechanically excited Brillouin scattering in integrated optomechanical waveguides made of piezoelectric material aluminum nitride (AlN). Acoustic phonons of 16 GHz in frequency are excited with nanofabricated electromechanical transducers to scatter counterpropagating photons in the waveguide into a single anti-Stokes sideband. We show that phase-matching conditions of Brillouin scattering can be tuned by varying both the optical wavelength and the acoustic frequency to realize tunable single-sideband modulation. Combining Brillouin scattering photonics with nanoelectromechanical systems, our approach provides an efficient interface between microwave and optical photons that will be important for microwave photonics and potentially quantum transduction. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement