Zero-reflection resonant mode with topological stability in non-Hermitian systems for robust wireless power transfer

Abstract

Conventional magnetic-resonance-based wireless power transfer (WPT) relies on strong coupling between the transmitter and receiver, which imposes stringent constraints on transfer distance, operating frequency, and load matching, thereby limiting the simultaneous achievement of high efficiency and robustness. Here, we show that WPT enabled by non-Hermitian physics represents a fundamentally different resonance mechanism rather than a refinement of conventional schemes. By introducing a laterally coupled auxiliary resonator, the system is converted into a third-order non-Hermitian configuration, in which power transfer is governed by the eigenmode structure of an effective non-Hermitian Hamiltonian. A zero-reflection resonant mode emerges, associated with a topological phase vortex, ensuring a stable real-eigenfrequency operating point. As a result, efficient energy transfer is no longer restricted to the strong-coupling regime. High efficiency and robustness against variations in transfer distance and load impedance are simultaneously achieved even under weak coupling, while the operating frequency becomes tunable and can be shifted away from high-loss resonances to reduce standby power consumption. Theoretical and experimental results consistently confirm the non-Hermitian origin, topological stability, and practical advantages of the proposed scheme, establishing non-Hermitian physics as a new resonance paradigm for wireless power transfer.