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(Color online) (a) Reflectivity spectra of PSi MC after filling with MEH-PPV by vacuum trapping. (b) Fluorescence spectra of the same sample (solid curve) and MEH-PPV spun cast onto flat Si (dash curve). Excitation wavelength is .
Schematics show (a) reflectance and (b) fluorescence of DBR/MC/DBR structure filled with polymer. Black and white strips correspond to PSi layers with low and high porosities. Gray color (first two layers) shows the area filled with polymer. Solid arrow is an incident light and dash arrows are reflected (a) and fluorescent light (b).
(Color online) Evolution of reflectance of PSi MC filled with MEH-PPV under TNT vapors: (a) solid—initial, dash—after and dash dot—after .
(Color online) Evolution of fluorescence upon exposure to TNT vapors for MEH-PPV. (a) entrapped into PSi MC: solid—initial, dash—after , dash dot—after . Dotted straight line corresponds to an initial spectral position of the MC “hole;” (b) time traces of the fluorescence for four wavelengths [shown by arrows in Fig. 3(a)] and (c) time traces of the fluorescence for MEH-PPV spun cast onto flat Si for 550, 570, and [spectrum is shown in Fig. 1(b)].
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