Fabrication of high-quality colloidal photonic crystals with sharp band edges for ultrafast all-optical switching
Feng Tian-Hua (冯天华), Dai Qiao-Feng (戴峭峰), Wu Li-Jun (吴立军), Guo Qi (郭旗), Hu Wei (胡巍), Lan Sheng (兰胜)
Laboratory of Photonic Information Technology, School for Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
Abstract Application of the pressure controlled isothermal heating vertical deposition method to the fabrication of colloidal photonic crystals is systematically investigated in this paper. The fabricated samples are characterized by scanning electron microscope and transmission spectrum. High-quality samples with large transmissions in the pass bands and the sharp band edges are obtained and the optimum growth condition is determined. For the best sample, the transmission in the pass bands approaches 0.9 while that in the band gap reaches 0.1. More importantly, the maximum differential transmission as high as 0.1/nm is achieved. In addition, it is found that the number of stacking layers does not increase linearly with concentration of PS spheres in a solution, and a gradual saturation occurs when the concentration of PS spheres exceeds 1.5 wt.%. The uniformity of the fabricated samples is examined by transmission measurements on areas with different sizes. Finally, the tolerance of the fabricated samples to baking was studied.
Received: 25 February 2008
Revised: 17 June 2008
Accepted manuscript online:
PACS:
81.20.-n
(Methods of materials synthesis and materials processing)
Fund: Project supported
by the National Natural Science Foundation of China (Grant No
10674051), the Natural Science Foundation of Guangdong province,
China (Grant No 06025082), the Program for Innovative Research Team
of the Higher Education in Guangdong (Gran
Cite this article:
Feng Tian-Hua (冯天华), Dai Qiao-Feng (戴峭峰), Wu Li-Jun (吴立军), Guo Qi (郭旗), Hu Wei (胡巍), Lan Sheng (兰胜) Fabrication of high-quality colloidal photonic crystals with sharp band edges for ultrafast all-optical switching 2008 Chin. Phys. B 17 4533
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