The dielectric function of the agZIF-62 was determined over the spectra range of 250-950 nm using a variable-angle spectroscopic ellipsometer (Sentech, SE850). One angle below (53°) and two angles above (61° and 65°) the Brewster angle of the glass (∼57 °) were chosen as angles of incidence θ. The back side was roughened to avoid multiple reflections during the ellipsometric measurement.