Spectral density analysis of the optical properties of Ni-Al2O3 nano-composite films

Gunnar A. Niklasson; Tobias K. Boström; Enis Tuncer

doi:10.1117/12.898174

3 October 2011 Spectral density analysis of the optical properties of Ni-Al₂O₃ nano-composite films

Gunnar A. Niklasson, Tobias K. Boström, Enis Tuncer

Proceedings Volume 8168, Advances in Optical Thin Films IV; 81680S (2011) https://doi.org/10.1117/12.898174
Event: SPIE Optical Systems Design, 2011, Marseille, France

Abstract

Thin films consisting of transition metal nanoparticles in an insulating oxide exhibit a high solar absorptance together with a low thermal emittance and are used as coatings on solar collector panels. In order to optimise the nanocomposites for this application a more detailed understanding of their optical properties is needed. Here we use a highly efficient recently developed numerical method to extract the spectral density function of nickel-aluminum oxide (Ni-Al₂O₃) composites from experimental data on the dielectric permittivity in the visible and near-infrared wavelength ranges. Thin layers of Ni-Al₂O₃ were produced by a sol-gel technique. Reflectance and transmittance spectra were measured by spectrophotometry in the wavelength range 300 to 2500 nm for films with thicknesses in the range 50 to 100 nm. Transmission electron microscopy showed crystalline Ni particles with sizes in the 3 to 10 nm range. The spectral density function shows a multi-peak structure with three or four peaks clearly visible. The peak positions are influenced by particle shape, local volume fraction distributions and particle-particle interactions giving rise to structural resonances in the response of the composite to an electromagnetic field.

Citation Download Citation

Gunnar A. Niklasson, Tobias K. Boström, and Enis Tuncer "Spectral density analysis of the optical properties of Ni-Al₂O₃ nano-composite films", Proc. SPIE 8168, Advances in Optical Thin Films IV, 81680S (3 October 2011); https://doi.org/10.1117/12.898174

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