Spin texture and chiral coupling of circularly polarized dipole field.

ABSTRACT: We show that a circularly polarized electric dipole harbors a near-field concentrated wave which orbits around with an energy flux significantly larger (five orders of magnitudes at ∼1 nm radial distance) than far-field radiation. This near-field wave is found to carry transverse spins and reveal skyrmion spin texture (Néel-type). By performing electromagnetic analysis and numerical simulation, we demonstrate chiral extraction of a near-field rotational energy flux: the confined energy flow is out-coupled to surface plasmons on metal surface, whose curvature is designed to provide orbital angular momentum matched to spin angular momentum of dipole field, that is, to facilitate spin-orbit interaction. Strong coupling occurs with high chiral selectivity (∼113) and Purcell enhancement (∼17) w

SUBMITTER: Shi Y 

PROVIDER: S-EPMC11501285 | biostudies-literature | 2023 Jan

REPOSITORIES: biostudies-literature