Sharp Focusing of Laser Light

Readers will learn in which ways light can be confined within a subwavelength region smaller than half a wavelength. Strictly within the focal spot, all degrees of freedom of light interact and manifest themselves in a dramatic way. The size and shape of the focal spot and the magnitude of sidelobes depend on the polarization state alongside phase and amplitude distributions of a light beam.Readers will learn techniques in which inhomogeneously (i.e., azimuthally and radially) polarized optical beams can be focused. In sharp focus, exotic phenomena can occur, including the negative propagation of light and a toroidal optical flow.Throughout the book, the numerical simulation is performed using the rigorous solution of Maxwells equations based on a FiniteDifference TimeDomain (FDTD) approach, which makes the results of modeling highly reliable. The photonic components, including optical metasurfaces, discussed in the book have been implemented using stateoftheart techniques of electron beam writing and reactive ionbeam etching of microrelief.Two chapters are concerned with photonics hot spots, which deal with the control of light by means of optical metasurfaces and the generation of an energy backflow in the region of sharp focus of a laser beam.Another hot topic is diffractive polarization converters implemented as subwavelength diffraction gratings to convert polarization of light. By way of illustration, such converters are shown to perform lineartoradial or lineartoazimuthal polarization conversion.The book describes advanced photonic components fabricated by the authors to perform sharp focusing of light, including binary zone plates, binary axicons, a planar photonic crystal lens, diffraction polarization converters, and metalenses.This book is a musthave for individuals and institutions studying cutting edge optics.