Fig. 3
From: Giant intrinsic circular dichroism of prolinol-derived squaraine thin films
Unpolarized optical properties of ProSQ-C16 thin films. (a) Total absorbance spectra −log(T) of spin-casted ProSQ-C16 thin films on glass, with thicknesses around 25 nm, thermally annealed at the indicated temperatures. Annealing at 120 °C, 180 °C and 210 °C results in similar spectra, and for clarity of the presentation only the absorbance measured at 180 °C is shown. Gray arrows are to guide the eye to see the evolution of the H- and J-band with annealing temperature. Above the graph photographs of selected samples annealed at the indicated temperatures are shown. b Effective real and imaginary part of the dielectric function ε′ = n2−k2 and ε′′ = 2nk, respectively, for ProSQ-C16 thin films annealed at 180 °C
