Recently, there has been much attention focused on photonic crystals and photonic bandgap materials [1]. The fabrication of these materials requires the formation of a periodic variation in the refractive index on a submicrometer length scale. It is anticipated that these structures will provide the building blocks required for future photonic devices and photonic integrated circuits. Applications are envisaged for structures with both 2- and 3-dimensional periodicity. In this communication we report results from a novel variant of ion beam lithography. The approach involves ion implantation through a mask of silica microspheres, followed by selective chemical etching.
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