2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Laser diffraction study of inverse opals

A. Sinitskii, V. Abramova, T. Laptinskaya and Yu. Tretyakov
Moscow State University, RU

photonic crystals, self-assembly, inverse opals, laser diffraction

We discuss the experimental data on laser diffraction in tungsten oxide photonic crystal films with an inverse opal structure. The samples were prepared using deposition of monodisperse polystyrene microspheres onto a vertical glass substrate, infiltration of voids with WO3 sol followed by its gelation, and final removal of the polymer microspheres by annealing. Scanning electron micrographs revealed that the films consisted of 25-500 m2 domains isolated by cracks. Diffraction patterns were recorded by illuminating the samples with a 532 nm laser beam and projecting the patterns onto a screen. When using laser diffraction, it was possible to examine the sample areas of about 70000 m2 and to visualize whether or not different domains have the same orientation. This method of quality control takes on special significance for inverse photonic crystals, for which average domain size is noticeably less than that of conventional opals.

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