LI Zhao-Lin1, NI Pei-Gen1, CHENG Bing-Ying1, JIN Chong-Jun1, ZHANG Dao-Zhong1,DONG Peng2, GUO Xing-Cai2
1Optical Physics Laboratory, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Science, Beijing 100080
2National Heavy Oil Research Laboratory, University of Petroleum, Beijing 102200
Silica Colloidal Crystals with Ethanol Solvent
LI Zhao-Lin1;NI Pei-Gen1;CHENG Bing-Ying1;JIN Chong-Jun1;ZHANG Dao-Zhong1,DONG Peng2;GUO Xing-Cai2
1Optical Physics Laboratory, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Science, Beijing 100080
2National Heavy Oil Research Laboratory, University of Petroleum, Beijing 102200
Abstract： We have prepared a silica colloidal crystal with ethanol, which has a face-centered cubic structure and a corresponding photonic band gap located in the visible region, determined by Kossel ring analysis and the transmission spectra. A special feature is an apparent variation of its lattice constant, as well as the gap frequency, with sample height. The Raman scattering induced by a picosecond laser at different heights of the colloidal crystal has been measured. It is found that the intensity of the Raman scattering is not related sensitively to the photonic gap, even though the Raman-Stokes Wavelength is inside the gap.
2000, Vol. 17 
