Metamaterials artificial electromagnetic media achieved by structuring on the
subwave-length-scale were initially suggested for the negative index and superlensing. They
became a paradigm for engineering electromagnetic space and controlling propagation of waves.
The research agenda is now shifting on achieving tuneable switchable nonlinear and sensing
functionalities. The time has come to talk about the emerging research field of metadevices
employing active and tunable metamaterials with unique functionalities achieved by structuring
of functional matter on the subwave-length scale. This book presents the first systematic and
comprehensive summary of the reviews written by the pioneers and top-class experts in the field
of metamaterials. It addresses many grand challenges of the cutting edge research for creating
smaller and more efficient photonic structures and devices.
