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Fabrication of Colloidal Photonic Crystals with Heterostructure by Spin-Coating Method
Authors:WANG Ai-Jun  CHEN Sheng-Li  DONG Peng  CAI Xiao-Gang  ZHOU Qian  YUAN Gui-Mei  HU Chun-Tian  ZHNG Dao-Zhong
Affiliation:State key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 1002249Department of Mathematics and Physics, China University of Petroleum, Beijing 102249Optical Physics Laboratory, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190
Abstract:Colloidal photonic crystal heterostructures, composed of two opaline photonic crystal films of silica spheres with different diameters, are fabricated by a two-step spin-coating method. Scanning electron microscopy (SEM) and UV-vis spectrophotometer are used to characterize the heterostructures. The SEM images show good ordering of the two-layer colloidal crystals constituting the heterostructures. The transmission spectra measured from the (111) plane in the heterostructure show that the composite colloidal photonic crystals have double photonic stop bands. Furthermore, when the sizes of the silica spheres used for fabricating the composite photonic crystal are slightly different, the transmission spectrum shows that the composite photonic crystals have more extended bandgap than that of the individual photonic crystals due to partial overlapping of its two photonic stop bands.
Keywords:42  70  Qs  81  16  Dn  74  78  Fk
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