Non-reciprocal transmission of microwave acoustic waves in nonlinear parity-time symmetric resonators
Non-reciprocal transmission of microwave acoustic waves in nonlinear parity-time symmetric resonators
复制标题
DOI：
10.1038/s41928-020-0414-z
复制
发表时间：
2020-05-18
影响因子：
34.3
通讯作者：
Loncar, Marko
中科院分区：
文献类型：
--
作者：
Shao, Linbo;Mao, Wenbo;Loncar, Marko
声波是多功能的片上信息载体，可用于微波过滤器和换能器等应用。非互易器件，其中波在两个端口之间的传输是不对称的，对于声子的操纵和路由是可取的，但由于声学系统通常具有线性响应，因此构建声学非互易器件是困难的。在这里，我们报道了在LiNbate平台上，利用基于两个耦合声谐振器的非线性奇偶时间对称系统来实现微波表面波的非互易传输。由于LiNbO_3具有很强的压电性，我们可以用电路来调节系统的增益、损耗和非线性。我们的方法可以在200 MHz的频率下实现10dB声表面波的非互易传输，并用它来演示级联非互易器件中声波的单向循环。
Acoustic waves are versatile on-chip information carriers that can be used in applications such as microwave filters and transducers. Nonreciprocal devices, in which the transmission of waves is non-symmetric between two ports, are desirable for the manipulation and routing of phonons, but building acoustic non-reciprocal devices is difficult because acoustic systems typically have a linear response. Here, we report non-reciprocal transmission of microwave surface acoustic waves using a nonlinear parity-time symmetric system based on two coupled acoustic resonators in a lithium niobate platform. Owing to the strong piezoelectricity of lithium niobate, we can tune the gain, loss and nonlinearity of the system using electric circuitry. Our approach can achieve 10 dB of non-reciprocal transmission for surface acoustic waves at a frequency of 200 MHz, and we use it to demonstrate a one-way circulation of acoustic waves in cascading non-reciprocal devices.