  Artificially structured metamaterials have enabled unprecedented flexibility
in manipulating electromagnetic waves and producing new functionalities,
including the cloak of invisibility based on coordinate transformation. Here we
present the design of a non-magnetic cloak operating at optical frequencies.
The principle and structure of the proposed cylindrical cloak are analyzed, and
the general recipe for the implementation of such a device is provided. The
cloaking performance is verified using full-wave finite-element simulations.
