Near atomically smooth, void-free, centimeter-long amorphous silicon waveguides are produced by high pressure chemical fluid deposition in the pores of a microstructured optical fiber template (right inset). Semiconductor waveguides fabricated by conventional deposition/fabrication approaches have a surface roughness that is a constraining factor in most optoelectronic devices, but these waveguides conform to the extraordinarily geometrically perfect optical fiber pores (DIC image, bottom inset).
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Baril et al. (2010) studied this question.
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