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      Improved broadband and quasi-omnidirectional anti-reflection properties with biomimetic silicon nanostructures.

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          Abstract

          Nature routinely produces nanostructured surfaces with useful properties, such as the self-cleaning lotus leaf, the colour of the butterfly wing, the photoreceptor in brittlestar and the anti-reflection observed in the moth eye. Scientists and engineers have been able to mimic some of these natural structures in the laboratory and in real-world applications. Here, we report a simple aperiodic array of silicon nanotips on a 6-inch wafer with a sub-wavelength structure that can suppress the reflection of light at a range of wavelengths from the ultraviolet, through the visible part of the spectrum, to the terahertz region. Reflection is suppressed for a wide range of angles of incidence and for both s- and p-polarized light. The antireflection properties of the silicon result from changes in the refractive index caused by variations in the height of the silicon nanotips, and can be simulated with models that have been used to explain the low reflection from moth eyes. The improved anti-reflection properties of the surfaces could have applications in renewable energy and electro-optical devices for the military.

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          Author and article information

          Journal
          Nat Nanotechnol
          Nature nanotechnology
          Springer Science and Business Media LLC
          1748-3395
          1748-3387
          Dec 2007
          : 2
          : 12
          Article
          nnano.2007.389
          10.1038/nnano.2007.389
          18654429
          777de80f-2b3e-45fd-88af-1dc8258cf713
          History

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