Science Daily July 5, 2023
Researchers at the University of Pittsburgh showed that a circularly polarized electric dipole harbors a near-field concentrated wave which orbits around with an energy flux five orders of magnitude larger than far-field radiation. The near-field wave was found to carry transverse spins and reveal skyrmion spin texture. By performing electromagnetic analysis and numerical simulation, they demonstrated chiral extraction of a near-field rotational energy flux: the confined energy flow was out-coupled to surface plasmons on metal surface, whose curvature was designed to provide orbital angular momentum matched to spin angular momentum of dipole field, that is, to facilitate spin–orbit interaction. Strong coupling occurred with high chiral selectivity and Purcell enhancement when both linear and angular momenta were matched between dipole field and surface plasmons. According to the researchers the existence of a high-intensity energy flux in the deep-bottom near-field region opens an interesting avenue in altering fundamental properties of dipole emission… read more. Open Access TECHNICAL ARTICLEÂ
Spatial distribution and time evolution of electric fields with transverse spins… Credit: Nanophotonics, vol. 12, no. 1, 2023, pp. 129-138.Â