Your knowledge of propagation of errors would be greatly appreciated in such a review. (wattsupwiththat.com)
Metasurfaces have been gaining increasing attention as they possess demonstrate exceptional abilities for propagation of light, giving rise to properties which are not available by conventional planar and thin interfaces. (european-mrs.com)
But if a beam is twisted, then the wavefront rotates around the beam's direction of propagation in a spiral, creating a vortex and leaving the beam with zero intensity at its centre. (scientificamerican.com)