A complementary media invisibility cloak that can cloak objects at a   distance outside the cloaking shell
  Based on the concept of complementary media, we propose an invisibility cloak operating at a finite frequency that can cloak an object with a pre-specified shape and size within a certain distance outside the shell. The cloak comprises of a dielectric core, and an "anti-object" embedded inside a negative index shell. The cloaked object is not blinded by the cloaking shell since it lies outside the cloak. Full-wave simulations in two dimensions have been performed to verify the cloaking effect. 
Yun Lai, Huanyang Chen, Zhao-Qing Zhang and C. T. Chan