Applicability of semi-analytical technique to design polydisperse coating for passive daytime radiative cooling

The semi-analytical technique is a simpler tool to model the radiative properties of the disordered coating with good accuracy and less computational time. In this method, scattering and absorption coefficients obtained from exact elec-tromagnetic solver such as Lumerical FDTD for lesser thick disordered coating are used to calculate radiative properties of the same coating for large thickness. Here, we have shown the applicability of this method to design polydisperse coating for passive daytime radiative cooling application. The coating contains TiO
2
, SiO
2
, and Si
3
N
4
particles in a matrix having refractive index of 1.5. The use of semi-analytical technique to design disordered coatings does not require much computational power as well as computational time.