Manipulation of Near Field Propagation and Far Field Radiation of Surface Plasmon Polariton This book mainly focuses on the study of steering electromagnetic fields in near field and far field contexts involving plasmonic structures. It also offers a new approach to achieving full control of optical polarizations and potentially boosting the development in photonic information processing. A new in plane phase modulation method is proposed and described by means of which a series of optical beams were realized with nanostructures in metal surfaces such as a plasmonic Airy beam broad band focusing beam and demultiplexing collimated beam as well as an optical orbital angular momentum (OAM) beam. Further the book presents a plasmonic polarization generator which can reconfigure an input polarization to all kinds of states simultaneously.