Near-Field Directionality Beyond the Dipole Approximation: Electric Quadrupole and Higher-Order Multipole Angular Spectra

J. Enrique Vázquez-Lozano, Alejandro Martínez, Francisco J. Rodríguez-Fortuño

Within the context of spin-related optical phenomena, the near-field directionality is generally understood from the quantum spin Hall effect of light, according to which the trans…