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Microspheres with Tunable Refractive Index by Controlled Assembly of Nanoparticles

机译：纳米粒子的受控组装可调节折射率的微球

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Monodisperse microspheres of high-refractive-index substances have a variety of potential applications, including optical resonators, microlenses, light diffusers, and chemical and biological probes. Equal-size microspheres can be obtained by the sol-gel reaction of precursors for silica particles and seeded emulsion or dispersion polymerizations for polymeric particles. However, since these conventional microspheres are made from silica and polymeric materials with relatively low refractive indices (1.4 < n < 1.6), the optical properties of the particles should be improved by either modifying their shape towards an optimal optical geometry or by increasing their refractive index to fully realize their potential for the aforementioned applications. Recently, several research groups have reported clever ways of fabricating microparticles with complex optical geometries using microfluidic devices. Doyle and his colleagues developed a photolithography technique using a continuous flowing stream inside a microfluidic chip for creating microparticles with 2D complex morphologies. Also, Nisisako and his co-workers produced bicolored Janus particles using thermally polymerizable monodisperse emulsion droplets that were generated from microfluidic devices. However, these approaches are still limited to polymeric particles, the refractive indices of which are not high enough for optics/ photonics applications.
机译：高折射率物质的单分散微球具有多种潜在应用，包括光学谐振器，微透镜，光漫射器以及化学和生物探针。等尺寸的微球可通过二氧化硅颗粒前体的溶胶-凝胶反应和种子聚合的乳液或分散聚合反应获得。但是，由于这些常规的微球是由二氧化硅和折射率较低的聚合物材料制成的（1.4

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