Figure 1

(a–c) Three-dimensional models of grating, multilayers, and mixed structures. (d, e) The Q value corresponding to the grating and multilayers with Q1 being increased to Q3 via the addition of the multilayer structure.

(a–c) Three-dimensional models of grating, multilayers, and mixed structures. (d, e) The Q value corresponding to the grating and multilayers with Q1 being increased to Q3 via the addition of the multilayer structure.