Tuning the Effective Width of the Optical Stop Band in Colloidal Photonic Crystals

The optical stop band in colloidal crystals is characterized by the central frequency and bandwidth. Although the former is known to be highly tunable by changing the lattice constant, the latter is basically determined by the refractive index contrast between the particles and the background medium...

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Bibliographic Details
Published in:Langmuir 2007-03, Vol.23 (7), p.3503-3505
Main Authors: Kanai, Toshimitsu, Sawada, Tsutomu, Toyotama, Akiko, Yamanaka, Junpei, Kitamura, Kenji
Format: Article
Language:English
Subjects:
Chemistry
Colloids - chemistry
Exact sciences and technology
General and physical chemistry
Liquid Crystals - chemistry
Spectrum Analysis
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Summary:The optical stop band in colloidal crystals is characterized by the central frequency and bandwidth. Although the former is known to be highly tunable by changing the lattice constant, the latter is basically determined by the refractive index contrast between the particles and the background medium that is intrinsic to the materials. In this study, we show that the effective bandwidth in gelled colloidal crystals can also be tuned by controlling the fabrication conditions. Single-domain gelled colloidal crystals were prepared by photopolymerization under various photoirradiation conditions. It was observed that the width of the stop band in the transmission or reflectance spectrum could be expanded by simply adjusting the irradiation time.
ISSN:0743-7463
1520-5827
DOI:10.1021/la0621160