Chen Zhao-Xian, Peng Yu-Gui, Chen Ze-Guo, Liu Yuan, Chen Peng, Zhu Xue-Feng, Lu Yan-Qing
National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, and College of Engineering and Applied Sciences, Nanjing University, Nanjing, 210093, China.
School of Physics and Innovation Institute, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, China.
Nat Commun. 2024 Feb 17;15(1):1478. doi: 10.1038/s41467-024-45932-6.
For classical waves, phase matching is vital for enabling efficient energy transfer in many scenarios, such as waveguide coupling and nonlinear optical frequency conversion. Here, we propose a temporal quasi-phase matching method and realize robust and complete acoustical energy transfer between arbitrarily detuned cavities. In a set of three cavities, A, B, and C, the time-varying coupling is established between adjacent elements. Analogy to the concept of stimulated Raman adiabatic passage, amplitudes of the two couplings are modulated as time-delayed Gaussian functions, and the couplings' signs are periodically flipped to eliminate temporal phase mismatching. As a result, robust and complete acoustic energy transfer from A to C is achieved. The non-reciprocal frequency conversion properties of our design are demonstrated. Our research takes a pivotal step towards expanding wave steering through time-dependent modulations and is promising to extend the frequency conversion based on state evolution in various linear Hermitian systems to nonlinear and non-Hermitian regimes.
对于经典波而言，相位匹配在许多情况下对于实现高效能量转移至关重要，例如在波导耦合和非线性光学频率转换中。在此，我们提出一种时间准相位匹配方法，并实现了任意失谐腔之间稳健且完全的声能转移。在由A、B和C组成的一组三个腔中，相邻元件之间建立了随时间变化的耦合。类似于受激拉曼绝热通道的概念，两个耦合的幅度被调制为时间延迟高斯函数，并且耦合的符号被周期性翻转以消除时间相位失配。结果，实现了从A到C的稳健且完全的声能转移。我们展示了设计的非互易频率转换特性。我们的研究朝着通过与时间相关的调制扩展波操控迈出了关键一步，并且有望将基于各种线性厄米系统中状态演化的频率转换扩展到非线性和非厄米领域。
