Between 10 to 25 μm, moderately doped EB behaves like a less dispersive, lossy dielectric. Its imaginary permittivity is larger compared to fully dedoped EB, indicating this transitional state involving a mixture of metallic and insulating phase. The small absorption features are also related to the delocalization of doped polymer chain. This intermediate state parallels the coexistence of metallic and insulating domains observed in phase-changing materials during metal-insulation transition. These similarities underscore the duality of the optical property changes in PANI and VO2, where both materials exhibit strong vibrational absorption in the insulating phase and a shift toward high absorption before the intrinsic reflectivity in the metallic phase as the conductivity becomes higher. The metal-insulation transition in PANI-CSA highlights the dynamic nature of their optical responses and their potential for actively tunable applications. Using experimentally measured optical properties, we demonstrate the concept of dynamic metasurface emitter through finite-difference time-domain (FDTD) simulation in both ES and EB states of PANI. The structure of meta-atom is shown in Figure . A continuous PANI spacer is placed in between a Au nanodisk and a back reflector substrate, resulting in a MIM perfect absorber configuration. With fixed metal thickness (tAu) and unit cell size (L), the reflectance spectra of the metasurface are dependent on the thickness of CP spacer (hCP), diameter of metal disk (D), and the optical properties of CP. A thickness of 150 nm is fixed for metal to ensure it can support the magnetic dipole, and L is 5 μm to prevent undesirable nearfield effect and optimize the contrast .