Controlled gradient colloidal photonic crystals and their optical properties

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• 作者：He Huang^a ; Junbo Chen^a ; Ye Yu^a ; Zengmin Shi^a ; Helmuth Mö ; hwald^b ; Gang Zhang^a ; ^{gang@jlu.edu.cn}
• 关键词：Controlled gradient ; Colloidal photonic crystal ; Inverse opal ; Tunable ; Fluorescence enhancement
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2013
• 出版时间：5 July, 2013
• 年：2013
• 卷：428
• 期：Complete
• 页码：9-17
• 全文大小：2199 K

文摘

Gradient colloidal photonic crystals (GCPCs) with gradients over sub-micrometer dimensions were fabricated by a plasma etching method. The gradient (along the surface normal) could be controlled by plasma treatment, leading to a wider tuning range of the stop band compared with colloidal photonic crystals (CPCs) without gradient. Spheres were non-close-packed (ncp) after plasma treatment, which provided larger voids for filling with materials to further tune the stop band of the GCPCs. Furthermore, GCPCs were used as templates to fabricate the corresponding inverse opals. The stop band of the inverse opal could also be modified through changing the filling materials and the templates of GCPCs. The GCPCs exhibited an 8.6-fold enhancement of fluorescence emission of Rhodamine B. According to the tunable optical property of GCPCs, they could be used in fields such as photonics, catalysis and life science.