**Preface XI**


Preface

Materials have received a great deal of attention since the theoretical prediction of their fas‐ cinating capabilities such as super-radiance and perfect absorbance or the design of invisi‐ bility cloaks. These are possible due to negative diffraction, experimentally achieved with the simultaneous induction of strong electric and magnetic dipolar moments. However, this particular condition supposes important technological constraints related to the availability

In this context, a new concept of metamaterials has been proposed where the polarizabilities are tailored by means of electromagnetic resonators. As an advantage, those devices can be fabricated on a surface and scaled to operate in different ranges of the spectra, as demon‐ strated with the realization of a wide range of metadevices beating diffraction limit. More‐ over, the planar geometry of those metasurfaces enables compatibility with current

This book offers a comprehensive overview of the state of the art in metasurfaces focusing on the well-known context of GHz devices. This opens the door to an intriguing scenario for development of further planar optical components, which comes with the latest advances in plasmonic nanoantennas and the onset of all-dielectric resonators. As a corollary, metamate‐

**Josep Canet-Ferrer**

University of Valencia, Spain

visiting researcher at ICMol - Institute of Molecular Science

of materials operating at frequencies of technological interest.

semiconductor and graphene technologies.

rials applications at the THz level are proposed.

