From Fig. 4(a), it can be seen that the absorption performance of the TNM structure is very robust to the variation of the period P, and the average absorption of the TNM structure can remain above 93% even if P varies by ±10%.
From Figure 4 (a), it can be seen that the absorption performance of the TNM structure is very robust to the changes in periodic P, and even if P changes by ± 10%, the average absorption of the TNM structure can remain above 93%.
As can be seen from fig. 4(a), the absorption performance of TNM structure is very robust to the change of period P, and even if P changes by 10%, the average absorption of TNM structure can remain above 93%.