亚光波长声波对微波频率集成光子谐振器的调制。

Sub-optical wavelength acoustic wave modulation of integrated photonic resonators at microwave frequencies.

机构信息

1] Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA [2] School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, Minnesota 55455, USA.

出版信息

Nat Commun. 2014 Nov 17;5:5402. doi: 10.1038/ncomms6402.

DOI:10.1038/ncomms6402

PMID:25400144

Abstract

Light-sound interactions have long been exploited in various acousto-optic devices based on bulk crystalline materials. Conventionally, these devices operate in megahertz frequency range where the acoustic wavelength is much longer than the optical wavelength and a long interaction length is required to attain significant coupling. With nanoscale transducers, acoustic waves with sub-optical wavelengths can now be excited to induce strong acousto-optic coupling in nanophotonic devices. Here we demonstrate microwave frequency surface acoustic wave transducers co-integrated with nanophotonic resonators on piezoelectric aluminum nitride substrates. Acousto-optic modulation of the resonance modes at above 10 GHz with the acoustic wavelength significantly below the optical wavelength is achieved. The phase and modal matching conditions in this scheme are investigated for efficient modulation. The new acousto-optic platform can lead to novel optical devices based on nonlinear Brillouin processes and provides a direct, wideband link between optical and microwave photons for microwave photonics and quantum optomechanics.

摘要

光声相互作用在基于体单晶材料的各种声光器件中得到了长期应用。传统上，这些器件在兆赫兹频率范围内工作，其中声波波长比光学波长长得多，需要长的相互作用长度才能实现显著的耦合。通过纳米级换能器，可以激发出亚光学波长的声波，从而在纳米光子器件中产生强烈的声光耦合。在这里，我们展示了微波频率表面声波换能器与压电氮化铝衬底上的纳米光子谐振器的共集成。在声波长显著小于光学波长的情况下，实现了超过 10GHz 的共振模式的声光调制。针对高效调制，研究了该方案中的相位和模态匹配条件。这种新的声光平台可以基于非线性布里渊过程产生新型光学器件，并为微波光子学和量子光机械学提供光学和微波光子之间的直接、宽带链路。