Prof. Yongshik Lee’s group demonstrated, for the first time, a metamaterial technology that cloaks electrically large objects electromagnetically, by designing an inhomogeneous isotropic refractive index that collimates the scattered wave into the forward direction rather than bending the wave around the object. By applying the intrinsic harmonics selection condition of metamaterials, multi-frequency operation is also possible without complex active controls. Experimental verification of such a cloak succeeded in increasing the practicality of the electromagnetic cloak technology based on metamaterials.

This research was conducted in collaboration with Prof. C. W. Qiu of National Singapore University (NUS), and the results will be published in the Physical Review Applied(IF 4.782) of American Physical Society.