Md Anamul Haque, Kei Mito, Takayuki Kurokawa, Tasuku Nakajima, Takayuki Nonoyama, Ilyas Muhammad and Jian Ping Gong
Hokkaido University, Japan University of Dhaka, Bangladesh
Posters & Accepted Abstracts: Polym Sci
In this paper, we report tunable angle dependence of stimuli responsive photonic hydrogels containing multi-lamellar structure of alternative rigid polymeric platelets of high refractive index and ductile polymer matrix of low refractive index. Therefore, the refractive index variation and periodic lamellar spacing satisfies the Bragg′s law to diffract visible light and the gel exhibits magnificent structural color. The packing geometry of periodic multi-lamellae of the photonic crystal is fabricated from flat-lamellae to cylindrical lamellae. 1D photonic crystalline lamellar sheet domains forms a rectangular sheet hydrogel in which the lamellar sheets aligned periodically parallel to the top surface. On the other hand, cylindrical rod-like colored gel is achieved by arranging periodic multicylinder packing of the lamellar domains. The cylindrical photonic hydrogel exhibits angle independent color whereas the sheet hydrogel reveals strong angle dependency. A rocking curve has been constructed to justify the tunable angle dependency of the multilamellar hydrogel. The tunable angle dependency of this photonic material could potentially benefits light modulation, visualization, optical sensing and display technologies. anamul@du.ac.bd
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