Hyper-reflective Colloidal Photonic Crystals with Narrow Bandwidth created by Shear-Induced Crystallization
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Self-assembly of monodisperse colloidal particles into regular lattices is relatively simple and efficient approach to prepare photonic crystals. However, creating colloidal photonic crystal film with high reflectance and low full-width at half maximum (FWHM) remains a challenge. Here a simple and fast method to prepare colloidal photonic crystals film by the shear-induced assembly of colloidal particles dispersed in a photocurable resin is suggested. In this research, we obtain photonic crystal film with high reflectance and narrow bandwidth through rearrangement of colloidal particles by adjusting the time of applying shear with the same moving distance of the plate. Through systematic analysis of the effect of shear, we find the optimum shear which forms array of high crystallinity. The high crystallinity is achieved when sufficient time is given slowly enough to allow the particles to be well aligned according to shear.