Author/Authors :
Romanov، نويسنده , , Sergei G and Maka، نويسنده , , Torsten and Sotomayor Torres، نويسنده , , Clivia M and Müller، نويسنده , , Manfred and Zentel، نويسنده , , Rudolf، نويسنده ,
Abstract :
Large area thin film photonic crystals consisting either of closely packed PMMA balls or their SnS2 replicas have been synthesized and tested. The photonic bandgap (PBG) of these structures demonstrates a tendency towards omnidirectionality and a subsequent increase of the refractive index contrast (RIC) in the inverted opal structure. In particular, the bandgap width in SnS2 replica exceeds that of PMMA opal by a factor of three. Observations of the PBG-related dip in photoluminescence spectra and the self-focusing of the emission of the dye/PMMA opal have proven the merit of quasi-three-dimensional photonic films in the control of light emission.
