Invisibility cloaking using pseudomagnetic field for photon

An invisibility cloak makes itself and the object inside undetectable from the outside. For a cloak designed using transformation optics, light is bent around the object by changing the sizes and shapes of the local dispersion surfaces of the metamaterials surrounding the object. Here, the authors have found another way to build a cloak by using a concept called pseudomagnetic field, which accelerates the photon in a direction perpendicular to its velocity. It corresponds to shifting local dispersion surfaces. The new cloak bends the light in an asymmetric fashion for light passing the left and right side of the object for a fixed polarization of pseudospin. A truncation of the inner materials of the cloak creates an additional asymmetric transmission behavior. Furthermore, the new method also enables one to design more optical devices, such as a retroreflector.