Tuneable optical lenses from diamond thin films

Nanocrystalline diamond (NCD) membranes of 150 nm thickness and diameters in the millimeter range grown by microwave-assisted chemical-vapor deposition were bulged to investigate their mechanical properties and their use as tuneable optical lenses. The NCD films were grown at different CH 4 / H 2 ga...

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Bibliographic Details
Published in:Applied physics letters 2009-07, Vol.95 (3), p.031905-031905-3
Main Authors: Kriele, A., Williams, O. A., Wolfer, M., Brink, D., Müller-Sebert, W., Nebel, C. E.
Format: Article
Language:English
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Summary:Nanocrystalline diamond (NCD) membranes of 150 nm thickness and diameters in the millimeter range grown by microwave-assisted chemical-vapor deposition were bulged to investigate their mechanical properties and their use as tuneable optical lenses. The NCD films were grown at different CH 4 / H 2 gas mixtures to vary the s p 2 / s p 3 ratio and thereby to tune their mechanical, optical, and surface morphology properties. By applying gas over pressure the membrane forms a lens shaped geometry. From deflection data we calculated Young’s moduli which decrease with increasing CH 4 / H 2 ratio from 1160 GPa at 0.5% to 900 GPa at 7%. Optical lens applications show a variation in the focal point from infinity to 3.5 mm. The data indicate that NCD is a promising material for tuneable optical lenses applications.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3183534