论文标题
非线性平均时间对称谐振器中微波声波的非偏置传播
Nonreciprocal Transmission of Microwave Acoustic Waves in Nonlinear Parity-Time Symmetric Resonators
论文作者
论文摘要
声波已成为多功能片上信息载体，其应用从微波炉到传感器。对于高频语音子的控制和路由，非转换设备是可取的。但是，由于大多数声学系统的线性响应，这具有挑战性。在这里，我们利用尼橙酸锂的强压力电源来证明使用电路的表面声波的完全可调的增益，损失和非线性。这允许构建非线性的偶然时间对称系统，并实现非注射传播。我们以低输入功率为3 $μ$ W的200 MHz声波实现了10分贝的非记录分贝，并进一步证明了通过级联的非临时设备的声波单向循环。我们的工作说明了这个压电平台在片上语音加工和非热物理学探索的潜力。
Acoustic waves have emerged as versatile on-chip information carriers with applications ranging from microwave filters to transducers. Nonreciprocal devices are desirable for the control and routing of high-frequency phonons. This is challenging, however, due to the linear response of most acoustic systems. Here, we leverage the strong piezoelectricity of lithium niobate to demonstrate fully tunable gain, loss, and nonlinearity for surface acoustic waves using electric circuitry. This allows the construction of a nonlinear acoustic parity-time-symmetric system and enables nonreciprocal transmission. We achieve a nonreciprocity of 10 decibels for a 200-MHz acoustic wave at a low input power of 3 $μ$W and further demonstrate one-way circulation of acoustic waves by cascading nonreciprocal devices. Our work illustrates the potential of this piezoelectric platform for on-chip phononic processing and exploration of non-Hermitian physics.
