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Nitrogen-rich silicon nitride thin films for deep-ultraviolet Mirau interferometry

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Abstract

We report experimental results on UV-transparent low-pressure chemical-vapor-deposition nitride thin films. We show that, by using nitrogen-rich rather than conventionally silicon-rich thin-film membranes, we are able to obtain more than 95% UV transparency below 250 nm, while keeping the stress of the membrane manageable and below standard nitride's giga-Pascal stress. Using these results, we were able to microfabricate a UV Mirau interferometer for correlation microscopy.

© 1997 Optical Society of America

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