Broadband achromatic phase retarder based on metal-multilayer dielectric grating
Li Na1, 2, Kong Wei-Jin1, 3, †, Xia Feng1, Yun Mao-Jin1, 3
       

Schematic diagram of the metal-multilayer dielectric grating used as an achromatic phase retarder with surface-relief, double-layer dielectric and metal-layer gratings.