Demonstration of topological wireless power transfer

Abstract

Recent advances in non-radiative wireless power transfer (WPT) technique essentially relying on magnetic resonance and near-field coupling have successfully enabled a wide range of applications. However, WPT systems based on double resonators are severely limited to short- or mid-range distance, due to the deteriorating efficiency and power with long transfer distance. WPT systems based on multi-relay resonators can overcome this problem, which, however, suffer from sensitivity to perturbations and fabrication imperfections. Here, we experimentally demonstrate a concept of topological wireless power transfer (TWPT), where energy is transferred efficiently via the near-field coupling between two topological edge states localized at the ends of a one-dimensional radiowave topological insulator. Such a TWPT system can be modelled as a parity-time-symmetric Su-Schrieffer-Heeger (SSH) chain with complex boundary potentials. Besides, the coil configurations are judiciously designed, which significantly suppress the unwanted cross-couplings between nonadjacent coils that could break the chiral symmetry of the SSH chain. By tuning the inter- and intra-cell coupling strengths, we theoretically and experimentally demonstrate high energy transfer efficiency near the exceptional point of the topological edge states, even in the presence of disorder. The combination of topological metamaterials, non-Hermitian physics, and WPT techniques could promise a variety of robust, efficient WPT applications over long distances in electronics, transportation, and industry.

References in corpus (20)

• Real Spectra in Non-Hermitian Hamiltonians Having PT Symmetry
• Topological Photonics
• Topological Photonics
• Possible Realization of Directional Optical Waveguides in Photonic Crystals with Broken Time-Reversal Symmetry
• Photonic Analogue of Two-dimensional Topological Insulators and Helical One-Way Edge Transport in Bi-Anisotropic Metamaterials
• Imaging topological edge states in silicon photonics
• Robust optical delay lines via topological protection
• Reflection-Free One-Way Edge Modes in a Gyromagnetic Photonic Crystal
• Efficient wireless non-radiative mid-range energy transfer
• Visualization of Branch Points in PT-Symmetric Waveguides
• Terahertz topological photonics for on-chip communication
• Experimental realization of photonic topological insulator in a uniaxial metacrystal waveguide
• Realization of a three-dimensional photonic topological insulator
• Three-Dimensional All-Dielectric Photonic Topological Insulator
• Edge states and the bulk-boundary correspondence in Dirac Hamiltonians
• PT-Symmetry in Non-Hermitian Su-Schrieffer-Heeger model with complex boundary potentials
• A Short Course on Topological Insulators: Band-structure topology and edge states in one and two dimensions
• Wireless power transfer via topological modes in dimer chains
• Experimental demonstration of the robust end state in a split-ring-resonator chain
• Zero-energy edge states and chiral symmetry breaking at edges of graphite sheets

Cited by in corpus (6)

• Higher-order valley vortices enabled by synchronized rotation in a photonic crystal
• Enhancement of photon blockade via topological edge states
• Application of topological edge states in magnetic resonance imaging
• Quasi-edge states and topological Bloch oscillation in the synthetic space
• Up-And-Coming Physical Concepts of Wireless Power Transfer
• Topological edge states and disorder robustness in one-dimensional off-diagonal mosaic lattices