(color online) Multilayered cylindrical hyperlens. (a) Schematic of hyperlens and numerical simulation of imaging of sub-diffraction-limited object. (b) Hyperlens imaging of an object (a pair of lines with spacing of 150 nm). From left to right, scanning electron microscope (SEM) image of a line-pair object fabricated near inner side of hyperlens, magnified hyperlens image showing that 150-nm-spaced line-pair object can be clearly resolved, and resulting diffraction-limited image from control experiment without hyperlens. The hyperlens that is used is comprised of 16 layers of Ag/Al₂O₃. Reproduced with permission from Ref. [23].