Topological spin defects of light

Topological defects are found in a variety of systems, and their existence is robust under perturbations due to topological nature. Here we introduce type defect electromagnetic waves: spin defects. Such associated with point where the density zero, generically has nontrivial texture surrounding point. Due such texture, possesses quantized charge. We provide examples isolated points, periodic or quasi-periodic lattices fields. points may find applications 3D imaging nanoparticle manipulation.