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Tunable asymmetric reflectance in silver films near the percolation threshold

Authors
  • Chen, Aiqing
  • Deutsch, Miriam
Type
Preprint
Publication Date
Apr 12, 2011
Submission Date
Oct 25, 2010
Identifiers
DOI: 10.1063/1.3585873
Source
arXiv
License
Yellow
External links

Abstract

We report on the optical characterization of semicontinuous nanostructured silver films exhibiting tunable optical reflectance asymmetries. The films are obtained using a multi-step process, where a nanocrystalline silver film is first chemically deposited on a glass substrate and then subsequently coated with additional silver via thermal vacuum-deposition. The resulting films exhibit reflectance asymmetries whose dispersions may be tuned both in sign and in magnitude, as well as a universal, tunable spectral crossover point. We obtain a correlation between the optical response and charge transport in these films, with the spectral crossover point indicating the onset of charge percolation. Such broadband, dispersion-tunable asymmetric reflectors may find uses in future light-harvesting systems.

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