Slow light propagation in stacked complementary metasurfaces at microwave frequencies

The possibility to slow down the light is one of the hot topics of modern optics nowadays. This phenomenon holds great promise for m any applications in compact optical pr ocessing devices. Examples including ultracompact optical modulators and switches, enhanced optical nonlinearities, optical buffering and optical memory for quantum computers [1,2]. C onventional schemes to sl ow down the light have been acco mplished by using disordered media [1], electromagnetic induced transparency [3], Bose-Einstein condensates [4] and on the phenomenon of light interference in a sequence of coupled resonators [5].