Optical properties of selectively absorbing Ni/Al2O3 composite films

H. G. Craighead; R. A. Buhrman

doi:10.1063/1.89732

Optical properties of selectively absorbing Ni/Al₂O₃ composite films

H. G. Craighead, R. A. Buhrman

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Abstract

Composite films of Ni particles embedded in an Al₂O₃ matrix have been produced by controlled coevaporation. The optical properties of the Ni/Al₂O₃ composites measured over the range of the solar spectrum are in good accord with the predictions of Maxwell-Garnett theory provided the Ni volume fraction is ≲0.2. The composite films have excellent spectral selectivity for the absorption of solar radiation, with a solar absorptivity of 0.94 obtained for a film produced with a composition gradient. Low-temperature emissivities of ∼0.1 have been obtained with composite films evaporated on highly reflecting metal substrates.

Original language	English (US)
Pages (from-to)	423-425
Number of pages	3
Journal	Applied Physics Letters
Volume	31
Issue number	7
DOIs	https://doi.org/10.1063/1.89732
State	Published - 1977

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "Composite films of Ni particles embedded in an Al2O3 matrix have been produced by controlled coevaporation. The optical properties of the Ni/Al2O3 composites measured over the range of the solar spectrum are in good accord with the predictions of Maxwell-Garnett theory provided the Ni volume fraction is ≲0.2. The composite films have excellent spectral selectivity for the absorption of solar radiation, with a solar absorptivity of 0.94 obtained for a film produced with a composition gradient. Low-temperature emissivities of ∼0.1 have been obtained with composite films evaporated on highly reflecting metal substrates.",

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year = "1977",

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AU - Craighead, H. G.

AU - Buhrman, R. A.

PY - 1977

Y1 - 1977

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AB - Composite films of Ni particles embedded in an Al2O3 matrix have been produced by controlled coevaporation. The optical properties of the Ni/Al2O3 composites measured over the range of the solar spectrum are in good accord with the predictions of Maxwell-Garnett theory provided the Ni volume fraction is ≲0.2. The composite films have excellent spectral selectivity for the absorption of solar radiation, with a solar absorptivity of 0.94 obtained for a film produced with a composition gradient. Low-temperature emissivities of ∼0.1 have been obtained with composite films evaporated on highly reflecting metal substrates.

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Optical properties of selectively absorbing Ni/Al₂O₃ composite films

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