Three-Dimensional Colloidal Crystal Arrays Exhibiting Stop Band in Near-Infrared Region

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• 作者：Mukesh Agrawal ; Dieter Fischer ; Smrati Gupta ; Nikolaos E. Zafeiropoulos ; Andrij Pich ; Elefterios Lidorikis ; Manfred Stamm
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：October 7, 2010
• 年：2010
• 卷：114
• 期：39
• 页码：16389-16394
• 全文大小：268K
• 年卷期：v.114,no.39(October 7, 2010)
• ISSN：1932-7455

文摘

We report on the fabrication of three-dimensional colloidal crystal arrays (CCAs) on an underlying substrate via gravity sedimentation of TiO₂-coated polystyrene (PS) colloidal particles. The beauty of the described system lies in the fact that obtained CCAs, for the first time, display a photonic band gap in the near-infrared (NIR) region with as much bandwidth (Δλ/λ) as 54−61%. Interestingly, stop band position and bandwidth have been found to be modulated with structural parameters of building blocks such as particle size and thickness of TiO₂ shell, etc. Moreover, no significant change in stop band position was observed with the variation in incidence angle of the light. Theoretical calculations from the simulation studies have been found in agreement with the experimental findings.