The summation of multiple reflection cancel out the first reflection 𝑟 / due to the absorption and optical path difference when propagating . As a result, AFP resonance is only dependent on hCP and materials properties. When the dielectric layer is sufficiently lossy, the AFP resonance allows wide angles of incidence at different polarization. The inset in Fig. shows the phasors of multiple reflection coefficients up to 𝑟 0 with 1 μm thick EB (n = 2.6 + 0.42i) on a metal substrate (n = 7.77 + 19.04i) at normal incidence at 10.25 μm. Fig. shows the optical power loss (-0.5ω|𝐸| ) ε 11 ) primarily locates near the top interface with substantial contribution from the metal ohmic loss.