Optical properties of selectively absorbing Ni/Al2O3 composite films

Harold G. Craighead, R. A. Buhrman

Research output: Contribution to journalArticle

59 Scopus citations

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 languageEnglish (US)
Pages (from-to)423-425
Number of pages3
JournalApplied Physics Letters
Volume31
Issue number7
DOIs
StatePublished - Dec 1 1977

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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