Silicon colloids with diameters from 0.5 μm to 5 μm are synthesized. Because of their spherical shape and smooth surface they work as optical microcavities with well-defined resonating modes in the near-infrared range. Silicon colloids are also the building blocks of photonic sponges formed by disorder networks of microspheres of different sizes that scatter light strongly in a wide range of wavelengths
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Fenollosa et al. (2007) studied this question.
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