Subwavelength Focusing with Reflective Metasurfaces Engineered Using the Concept of Perfect Lens

It is highly desirable to break the diffraction limit on the resolution of optical devices and achieve subwavelength focusing. Despite numerous solutions that have been developed throughout the years, a practical method to obtain subwavelength focusing without the generation of undesired sidelobes is a challenge to this day. We have developed a feasible strategy to achieve this goal based on the concept of perfect lens. We envisage important practical applications of subwavelength focusing that become possible using this method.