An all‐dielectric semispherical lens with functions in shaping 3D wave‐propagation paths is proposed and experimentally verified. When radiation sources are placed in the central region, the lens behaves as a magnifying device to resolve the sources in subwavelength scale; while when the electromagnetic waves impinge on the semispherical lens from outside, they will be guided spirally inward.

The concept of multifunctional transformation-dc devices is proposed and verified experimentally. The functions of dc metamaterials can be remotely altered by illuminating with visible light. If the light-induced dc illusion effect is activated, the electrostatic behavior of the original object is perceived as multiple equivalent objects with different pre-designed geometries. The experimental verification of the functional device makes it possible to control sophisticated transformation-dc devices with external light illumination.

We propose a strategy to design localized transformation optics devices, and take the localized invisibility cloaks as examples to illustrate their special properties. Different from the global cloaks that make the enclosed objects completely invisible, the localized cloaks will conceal the scattering signals of certain parts of the enclosed objects and keep the signals of remaining parts being unchanged. We design, fabricate, and measure a localized dc invisibility cloak in the steady currents by using the localized transformation electrostatics. Simulation and experimental results show that the potential distribution outside the localized dc invisibility cloak is exactly the same as that of a part of the cloaked object.

Cheng‐Wei Qiu, Tie Jun Cui, and co‐workers present an all‐dielectric semispherical lens with functions in shaping 3D wave‐propagation paths in article 1600022. The cover image shows principle of the 3D super‐resolution imaging system, which includes a semispherical magnifying meta‐lens and a planar focusing lens. The semispherical lens magnifies signals of the objects located at the core of lens and the focusing lens gathers the magnified signals and focuses them to generate the image of the objects.