Structure and Transmission Spectra for Colloidal Crystals with Silica Spheres
MEI Dong-bin, DONG Peng1, LI Hong-qiang, CHENG Bing-ying, ZHANG Dao-zhong
Optical Physics Laboratory, Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
1National Heavy Oil Research Laboratory, University of Petroleum, Beijing 102200
Structure and Transmission Spectra for Colloidal Crystals with Silica Spheres
MEI Dong-bin;DONG Peng1;LI Hong-qiang;CHENG Bing-ying;ZHANG Dao-zhong
Optical Physics Laboratory, Institute of Physics & Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
1National Heavy Oil Research Laboratory, University of Petroleum, Beijing 102200
Abstract： An ordered colloidal structure of SiO2 spheres of 0.33μm diameter has been formed in distilled water. It is a face-centered cubic structure with a lattice constant of 0.54μm and a volume fraction of 0.48, as determined by the Kossel rings analysis. The light transmission in the [111] direction exhibited a dip located at 11600cm-1. A plane wave expansion method is used to calculate the lowest gap at the L point. The gap center coincides quite well with the measured transmission dip.
1998, Vol. 15 
