The FEM method was used to simulate the absorption spectra of various structures, and the simulated results of various structures are shown in Fig. 2. As here, due to the optimal structure that we designed, the achieved transmittance is zero for each and every structure so we can determine absorptivity using A = 1 – R, as T = 0, where R denotes reflection and T is transmittance and this is validated using simulation results presented in Figs. 2 and 3. An illustration of the UWBSEA’s absorption optimization procedure is shown in Fig. 2a. Figure 2b shows the simulated spectra as the absorption performance improves gradually. To begin with, we have employed the three layer structure consisting of the TiN, SiO2, and Cr layer without resonator (WR) structures considering the optimization, and this structure provided the overall average absorptance of 47.27% average…
Highly efficient, perfect, large angular and ultrawideband solar energy absorber for UV to MIR range
