Breaking the diffraction limit in far field by planar metalens

Optical lens is of fundamental importance in both scientific researches and industrial communities, especially for the aspects of optical focusing and imaging. In traditional optics, the light modulation property is limited by the Rayleigh Criterion （0.6 λ/NA）, and therefore the development of an ideal lens that produces sub-diffraction limit focusing and imaging has been a dream of lens makers all the time. Intensive effort has been made to break this barrier for centuries, however, all the reported techniques suffer from certain limitations for general applications, such as near-field operation, small field of view, or object dyeing which works only for a narrow-class of samples [1-3].

Optical lens is of fundamental importance in both scientific researches and industrial communities,especially for the aspects of optical focusing and imaging.In traditional optics,the light modulation property is limited by the Rayleigh Criterion(0.61λ/NA),and therefore the development of an ideal lens that produces sub-diffraction limit focusing and imaging has been a dream of lens makers all the time.Intensive