ABSTRACT
This chapter introduces the resonant metalens, a superlens that uses the positively refracting band of locally resonant metamaterials to achieve super-resolution imaging from the far field. It proposes initial experimental demonstrations of the concept in the field of microwaves and audible acoustics. The chapter presents the numerical demonstration of the potentialities of the approach in the visible range of the electromagnetic spectrum using a resonant metalens made out of plasmonic nanoresonators. It gives how these numerical results could be obtained on a real optical table with spatial light modulators by drastically simplifying the requirements of the imaging and focusing procedure. The chapter discusses two key principles of the resonant metalens, namely that it permits: to code the spatial information of a source or object placed in its near field in the complex spectrum of the field propagating in the lens; and to convert this near-field information into propagating waves that can be collected efficiently in the far field.
