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Integrated colloidal photonic crystals with different bandgaps are prepared by molding photocurable SiO2 suspensions and subsequent photopolymerization under UV irradiation. The suspensions show spontaneous crystallization of SiO2 particles and reflect iridescent colors (see figure). The bandgap position is precisely controlled by the particle volume fraction. Such photonic structures can be used...
The cover shows a schematic illustration of patterned colloidal photonic crystals with different bandgap positions. When an unknown light source impinges on the patterned photonic crystals, the light information can be identified from the reflection intensity profile of the constituent photonic crystals. The two optical microscopy images and background image display integrated photonic crystals with...
Despite of wide range of potential applications, 3D functional microparticles with nanostructures cannot be prepared readily by conventional synthetic schemes. Here, we will consider two different routes for the microparticles: namely, self-organization of photo-responsive complex colloids inside microfluidic devices and holographic lithography directly on pre-patterned microfluidic channels. The...
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