合成拓扑设备用于推进弹性能量 harvesting
Synthetic topological device for advancing elastic energy harvesting
AI总结：
本研究提出了一种合成维度的高阶拓扑绝缘体，通过工程弹性 metamaterials 的弯曲带，实现了在声子板角落的强弹性到电能转换，为超声设备和自供电传感器应用提供了新途径。
摘要：
高效地收集超声弹性波能量对于为许多新兴技术中的电子设备供电至关重要，例如可穿戴设备、无线传感和生物医学植入物。尽管拓扑声子 metamaterials 近年来已被证明是用于通过稳健的束缚态来约束和引导弹性波的有前途的范式，但实现超高 Q 值的拓扑共振并增强能量转换效率仍然是一个挑战。在本工作中，我们通过工程弹性 metamaterials 的弯曲带，提出了一种合成维度的高阶拓扑绝缘体，其特征是具有高度局部化的拓扑边缘态。这种拓扑边缘模式源于合成维度带结构中 Bulk 极化和 Chern 数的非零组合，从而在声子板的角落处产生强的弹性到电能转换能力。通过数值模拟和实验验证，已经证明了局部化模式的直接证据，这些模式具有稳健的保护，并能够激活 LED 灯阵。我们的发现为拓扑物理赋能的超声设备开辟了新途径，并为弱信号检测和自供电传感器的应用展示了广阔前景。
英文摘要：
High-efficiency energy harvesting of ultrasonic elastic waves are crucial for powering electric gadgets in many emerging technologies such as wearable devices, wireless sensing, and biomedical implants. Although topological phononic metamaterials have recently been demonstrated as a promising paradigm for confining and guiding elastic waves through robust bound states, achieving ultrahigh-Q topological resonance with enhanced energy conversion efficiency remains a challenge. In this work, we propose a synthetic-dimensional higher-order topological insulator by engineering the flexural bands of elastic metamaterials, featuring highly localized topological hinge states in the bulk bands. This topological hinge mode stems from the nonzero combination of the bulk polarization and the Chern number in the synthetic-dimensional band structure, thus giving rise to a strong elastic-to-electric energy conversion at the corner of the phononic plate. Through numerical simulations and experimental validations, straightforward evidence of the localized modes with robust protection and consequent abilities in activating the light-emitting diodes (LEDs) array have been demonstrated. Our findings open a new avenue for topological-physics-enabled ultrasonic devices and present promising prospects for applications in weak-signal detection and self-powered sensors.
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