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Tuneable optical lenses from diamond thin films

 
: Kriele, A.; Williams, O.A.; Wolfer, M.; Brink, D.; Müller-Sebert, W.; Nebel, C.E.

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Applied Physics Letters 95 (2009), No.3, Art. 031905, 3 pp.
ISSN: 0003-6951
ISSN: 1077-3118
English
Journal Article
Fraunhofer IAF ()
nanodiamond; Young's modulus; tuneable microoptics; membrane; Nanodiamant; Young Modul; einstellbare Mikrooptik

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(ind 4)/H(ind 2) gas mixtures to vary the sp(exp 2)/sp(exp 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(ind 4)/H(ind 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.

: http://publica.fraunhofer.de/documents/N-100565.html