Fig. 1

(a) Absorption spectra of PVA, undoped (0), and doped with TDBC dye in monomer phase (1) and J-aggregate phases (2–4), and its dependence on the TDBC concentration. 1, 2, 3 and 4 correspond, in weight% (wt%), to 0.006, 0.15, 0.3, and 0.8% w/w; respectively. Absorption increases with the increased concentration. The structure of TDBC is shown as an inset to the left figure. (b) Normalized spectra of the monomer and J-aggregate phases. (c) Complex dielectric constant, i.e. real and imaginary parts, i.e. \(\:{\epsilon\:}^{{\prime\:}}\left(\omega\:\right)\) and \(\:{\epsilon\:}^{{\prime\:}{\prime\:}}\left(\omega\:\right)\), of TDBC-PVA samples having three different concentrations. Subscripts 1, 2, 3 in this figure correspond to subscripts 2, 3, 4 of Fig. (a), i.e. they correspond to the 3 different solutions of J-aggregate TDBC. The samples thicknesses are indicated as an inset to the figure.