Polymer Colloidal Crystals for Laser Applications

概要

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The monodispersed microparticles have an intrinsic capability to self-assemble the face-centered cubic lattice structures on the substrate from the suspension media. The highly ordered 3-D architectures of colloidal particles are called colloidal crystals (CCs). The CC structures have received tremendous interest as one of the alternative and facile fabrication techniques of the 3-D photonic crystal structures. Significant progress has established not only various fabrication techniques for high-quality CCs, but also their versatile applications to optical sensors with external stimuli. In this report, we have developed a novel potential utility of CCs for the flexible polymer lasers by low-threshold optical excitation. The laser cavity structure consists of an intermediate light-emitting layer containing fluorescent dye sandwiched between a pair of polymeric CC films. The optical excitation of the device gave rise to the laser oscillation within the photonic band-gap of the CC films. Interestingly, the laser action could be generated by optical excitation even though the CC laser device of all polymer materials are bent in shape by mechanical stress.
粉体工学会の論文