Tuneable optical lenses from diamond thin films

Kriele, Armin, Williams, Oliver Aneurin ORCID: https://orcid.org/0000-0002-7210-3004, Wolfer, M., Brink, D., Muller-Sebert, W. and Nebel, Christoph E. 2009. Tuneable optical lenses from diamond thin films. Applied Physics Letters 95 (3) , 031905. 10.1063/1.3183534

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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 CH4/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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Uncontrolled Keywords:	Chemical vapour deposition; Diamond; Lenses; Membranes: Optical films; Optical focusing; Optical tuning; Surface morphology; Young's modulus
Publisher:	AIP
ISSN:	0003-6951
Last Modified:	14 May 2023 05:14
URI:	https://orca.cardiff.ac.uk/id/eprint/7372

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