Superlens-Based Nanoscale Imaging

Since the discovery of the superlens (a lens that uses metamaterials to go beyond the diffraction limit), optical imaging for nanometer-sized objects has become possible. A superlens basically aids in the resolution improvement of an image, which is the primary essence to observe subwavelength features (in the nanometer range). The subwavelength features are missed in conventional optical imaging systems due to the diffraction limit of light. In the 21st century, various methods have been proposed to conduct nano-imaging using superlenses. This article provides a basic insight of nano-imaging using superlenses, various problems and limitations in nanovision, and the latest improvements in research.