Figure 3
From: A broadband reflective-type half-wave plate employing optical feedbacks

Experimental and numerical results for the proposed half-wave plate operating under quasi-normal incidence. (a) Amplitude coefficients for the co-polarized and cross-polarized components of the reflected beam. (b) Phase difference of the reflected beams between cases where the polarizations of the input beam are parallel and perpendicular to the grating wires. Note that the incident angle is 5 degrees.