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Development and study of the process of photonic-crystal film depositing by centrifugation

The article describes one of the promising methods of depositing highly ordered arrays of polystyrene microspheres from colloidal suspension through centrifugation. The simplicity and availability of the method determine the sensibility of its application in the deposition of high-quality ordered photonic-crystal planar structures for devices in nanophotonics, nanoelectronics, sensorics and security systems. A theoretical description of the process of colloidal microspheres self-organization into an ordered structure, the so-called opal matrix, occurring during centrifugation of a suspension is given. The technological equipment and accessories required for the implementation of the method in laboratory conditions are shown. The technological factors affecting the reflection of the formed structures in the region of the photonic band gap have been studied; a mathematical model of the colloidal suspension centrifugation process was developed and analyzed. The main modes of the centrifugation process ensuring an acceptable quality of the samples have been selected.