Robust long-range optical pulling using a single-mode topological chiral edge state

The authors demonstrate here robust long-range optical pulling via a single-mode topological chiral edge state. A particle-induced local gap produces evanescent modes that confine waves inside the particle, where rapid decay generates a pulling force via negative electric field intensity gradients. Unlike multimode states, the single-mode state can pull multiple particles simultaneously in one transport channel, offering structural simplicity, robustness against disorder, and enhanced potential for integration. This work provides a new mechanism to particle manipulation using topological chiral edge states.