B_2O_3-P_2O_5-SiO_2(BPS)three-dimensional(3D)high-organizedpolystyrene(PS)opalsandinverseopalswithlargedomainwerefabricatedandcharacterized.Scanningelectronmicroscope(SEM)showsthreeorfoursmall'windows',indicatingthataverywellinterconnectionbetweenPSspheresofopal.Theultraviolet-visible(UV-vis)spectraindicatethatthephotonicbandgaps(PBGs)areabout710and604nmfor320-and270-nmspheresrespectively.WhileaccordingtoBragg'sequation,thesimulationresultsshouldbe762and643nm,whichmeanthat52and39nmwereshiftedtoblueregion,respectively.
