February 26, 2014

Broadband field rotator based on acoustic metamaterials

The last decades have witnessed intensive attentions focused on the transformation optics, as well as the transformation acoustics,  which have paved the way for the design of metamaterials with unprecedented flexibility in controlling and guiding waves. This results in various conceptual devices with wave-manipulation functionalities, such as invisibility  and illusion cloaks,  field rotators,  and omnidirectional absorber.  Among these fascinating designs, the field rotator is an important one which can be attributed as a special kind of illusion cloak,  with the capability of making the object inside it appears like a rotated one. Moreover, it belongs to a few of those designs that can be experimentally implemented, but only for electromagnetic waves and liquid waves.