Electromechanical Brillouin scattering in integrated planar photonics
Electromechanical Brillouin scattering in integrated planar photonics
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DOI：
10.1063/1.5108672
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发表时间：
2019-08-01
期刊：
影响因子：
5.6
通讯作者：
Li, Mo
中科院分区：
文献类型：
--
作者：
Li, Huan;Liu, Qiyu;Li, Mo
布里渊散射，即光通过声音的散射，已经为实际应用带来了一系列新的物理现象和设备功能的展示。与光学力激励相比，换能器在压电材料上对声波的机电激励具有足够强的声波，可以在紧凑的器件面积内获得接近单位的散射效率，这对于实际应用是必不可少的。最近，人们已经证明了千兆赫兹声波可以在集成的光子波导和腔体中被机电激发来散射导波，从而产生诱人的透明和非互易模式转换等有趣的现象，以及先进的光学功能。新型集成的机电布里渊器件，利用最先进的纳米制造能力和压电薄膜材料，以前所未有的器件集成度、超高频和强大的光声相互作用，成功地实现了导波声光。在这里，我们实验地演示了在机电激励千兆赫兹(类似于11 GHz)声兰姆波的平面光子器件中导引电信波段光的大角度(60度)声光偏转。该器件由集成换能器、波导和透镜组成，全部制作在330 nm厚的悬浮氮化铝薄膜上。相比之下，传统的导波声光器件最多只能实现几度的偏转。我们的工作展示了这种新型声光器件平台的前景，它可能会在片上波控和布线、光谱分析、高频声光调制器、射频或微波滤波器和延迟线以及光学隔离器等非互易光学器件中得到潜在的应用。(C)2019年作者(S)。
The exploitation of Brillouin scattering, the scattering of light by sound, has led to demonstrations of a broad spectrum of novel physical phenomena and device functionalities for practical applications. Compared with optomechanical excitation by optical forces, electromechanical excitation of acoustic waves with transducers on a piezoelectric material features intense acoustic waves sufficient to achieve near-unity scattering efficiency within a compact device footprint, which is essential for practical applications. Recently, it has been demonstrated that gigahertz acoustic waves can be electromechanically excited to scatter guided optical waves in integrated photonic waveguides and cavities, leading to intriguing phenomena such as induced transparency and nonreciprocal mode conversion, and advanced optical functionalities. The new integrated electromechanical Brillouin devices, utilizing state-of-the-art nanofabrication capabilities and piezoelectric thin film materials, succeed guided wave acousto-optics with unprecedented device integration, ultrahigh frequency, and strong light-sound interaction. Here, we experimentally demonstrate large-angle (60 degrees) acousto-optic beam deflection of guided telecom-band light in a planar photonics device with electromechanically excited gigahertz (similar to 11 GHz) acoustic Lamb waves. The device consists of integrated transducers, waveguides, and lenses, all fabricated on a 330 nm thick suspended aluminum nitride membrane. In contrast, conventional guided-wave acousto-optic devices can only achieve a deflection angle of a few degrees at most. Our work shows the promises of such a new acousto-optic device platform, which may lead to potential applications in on-chip beam steering and routing, optical spectrum analysis, high-frequency acousto-optic modulators, RF or microwave filters and delay lines, as well as nonreciprocal optical devices such as optical isolators. (C) 2019 Author(s).