Slow propagation of 2 GHz acoustical waves in a suspended GaAs phononic waveguide on insulator

G. Modica, R. Zhu, R. Horváth, G. Beaudoin, I. Sagnes, R. Braive
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引用次数: 6

Abstract

Optoelectronic oscillators have dominated the scene of microwave oscillators in the last few years thanks to their great performances regarding frequency stability and phase noise. However, miniaturization of such a device is an up to date challenge. Recently, devices based on phonon-photon interaction gather a lot of interest thanks to their extreme compactness and working frequency directly in the GHz. In this frame, a still missing element to obtain long-term frequency stability performances is an on-chip delay within the feedback loop. Here, we experimentally show filtering and slow propagation of 2 GHz acoustic waves on a Gallium Arsenide membrane heterogeneously integrated on silicon wafer. By engineering the dispersion of an acoustical waveguide, we evidence a group velocity below 1000 m/s for the mode able to propagate. Thus, an integrated delay implementation is at reach for potential improvement of opto-acoustic devices such as optomechanical oscillators or wireless applications.
绝缘体上悬浮式砷化镓声子波导中2ghz声波的慢传播
光电子振荡器由于其在频率稳定性和相位噪声方面的优异性能,近年来在微波振荡器领域占据主导地位。然而,这种设备的小型化是一个最新的挑战。最近,基于声子-光子相互作用的器件由于其极端紧凑和工作频率直接在GHz而引起了人们的极大兴趣。在这个框架中,仍然缺少获得长期频率稳定性能的元素是反馈回路中的片上延迟。在这里,我们实验展示了2 GHz声波在硅片上非均匀集成的砷化镓膜上的滤波和慢传播。通过设计声波导的色散,我们证明了能够传播的模式的群速度低于1000米/秒。因此,集成延迟实现可用于光声设备(如光机械振荡器或无线应用)的潜在改进。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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