Figure 4
From: Spectral effectiveness of engineered thermal cloaks in the frequency regime
Standard deviation ratio of Milton's cloaks at angular frequencies ω = 0 rad.s−1 with R2 = 2R1 (red), R2 = 2.5R1 (green) and R2 = 3R1 (black).
Note that the black curve is similar to green (Pendry's cloak) and black (Kohn's cloak) curves in the upper left panel of Fig. 3. The horizontal dashed blue line indicates the height of minimum of the standard deviation ratio among the studied Milton's cloaks.
