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Normal reflectance (green) and transmittance (red) of dye-doped, layer-structured DCG samples. The solid and dotted lines are obtained by white-light incidence on the gelatin and substrate sides, respectively, as illustrated in the upper-left schematic inset in (a). The black lines show the transmittance in the unexposed regions. The lower-right insets show close-up, cross-sectional SEM images of the layered structures in the upper-middle regions of the samples. The white scale bars are .
PL spectra of the substrate-side (pink) and gelatin-side (orange) emissions of dye-doped DCG samples as depicted in Fig. 1, obtained by using the schematic setup in the top inset. Also shown are the optical spectra (green lines for reflection and red lines for transmission) at the stop bands. The pumping energies (in /pulse) are (a) 0.63 (pink), 0.50 (orange); (b) 0.99 (pink), 1.00 (orange); (c) 0.41 (pink), 0.66 (orange); (d) 1.25 (pink), 1.23 (orange). The blue lines are the PL spectra of Rhodamine 590-doped DCG in the unexposed regions.
The PL spectrum of the sample in Fig. 1(b) as a function of the pumping energy. The upper inset shows the measured peak emission intensity (circles) at . The dotted and solid lines are linear fits for pumping energies below and above the lasing threshold, respectively. The lower inset shows the multimode lasing from Fig. 1(b).
(a) Normal reflectance (green) and transmittance (red) obtained from the transfer matrix model. The solid and dotted lines are obtained by light incidence on the gelatin and substrate sides, respectively. (b) Simulated emission spectra for the dye-doped DCG samples from the substrate (pink) and gelatin (orange) sides using the layer configuration in (a) in comparison with the simulated emission spectrum of dye in free space (black).
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