1. Tuneable optical lenses from diamond thin films.
- Author
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Kriele, A., Williams, O. A., Wolfer, M., Brink, D., Müller-Sebert, W., and Nebel, C. E.
- Subjects
OPTICAL instruments ,THIN films ,ARTIFICIAL membranes ,MICROWAVES ,CHEMICAL vapor deposition ,MICROWAVE lenses - Abstract
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 /H2 gas mixtures to vary the sp2 /sp3 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 CH4 /H2 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. [ABSTRACT FROM AUTHOR]- Published
- 2009
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