Abstract
Butane has been decomposed in the post-discharge of a helium-argon microwave plasma, assisted by a radiofrequency (rf) plasma. The ion bombardment on the substrate, monitored by the rf power, is found to control the optical and luminescence properties of hydrogenated amorphous carbon (a-C:H) thin films: the extinction coefficient of a-C:H increases with rf power while the photoluminescence efficiency decreases by three orders of magnitude. The parametrization of the dielectric function, using a three-phase effective medium approximation, is discussed in relation to the expected size effects on the dielectric function of the π-bonded clusters.
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