Broadband achromatic phase retarder based on metal-multilayer dielectric grating

Li Na^{1, 2}, Kong Wei-Jin^{1, 3, †}, Xia Feng¹, Yun Mao-Jin^{1, 3}

(color online) Designed MMDG characteristics spectrum with TE and TM waves, showing wavelength-dependent (a) phase retardation and (b) diffraction efficiency.