Metal/dielectric/metal sandwich film for broadband reflection reduction

Yi Jun Jen, Akhlesh Lakhtakia, Meng Jie Lin, Wei Hao Wang, Huang Ming Wu, Hung Sheng Liao

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Abstract

A film comprising randomly distributed metal/dielectric/metal sandwich nanopillars with a distribution of cross-sectional diameters, displayed extremely low reflectance over the blue-to-red regime, when coated on glass and illuminated normally. When it is illuminated by normally incident light, this sandwich film (SWF) has a low extinction coefficient, its phase thickness is close to a negative wavelength in the blue-to-red spectral regime, and it provides weakly dispersive forward and backward impedances, so that reflected waves from the two faces of the SWF interfere destructively. Broadband reflection-reduction, over a wide range of incidence angles and regardless of the polarization state of the incident light, was observed when the SWF was deposited on polished silicon.

Original languageEnglish (US)
Article number1672
JournalScientific reports
Volume3
DOIs
StatePublished - Apr 29 2013

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