Improved broadband and quasi-omnidirectional anti-reflection properties with biomimetic silicon nanostructures
Journal
Nature Nanotechnology
Journal Volume
2
Journal Issue
12
Pages
770-774
Date Issued
2007
Author(s)
Huang, Y.-F.
Chattopadhyay, S.
Jen, Y.-J.
Peng, C.-Y.
Liu, T.-A.
Hsu, Y.-K.
Pan, C.-L.
Lo, H.-C.
Hsu, C.-H.
Lee, C.-S.
Chen, K.-H.
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. © 2007 Nature Publishing Group.
SDGs
Other Subjects
Biomimetics; Light polarization; Military applications; Nanotips; Refractive index; Silicon wafers; Angles of incidence; Nanostructured surface; Natural structures; Reflection of light; Renewable energies; Scientists and engineers; Silicon nano structures; Sub-wavelength structures; Light reflection; biomaterial; helium; nanomaterial; neon; silicon; article; biomimetics; contrast; low temperature; medical research; moth; polarimetry; polarization; priority journal; reflectometry; refraction index; simulation; spectral sensitivity; structure analysis; ultraviolet radiation
Publisher
Nature Publishing Group
Type
journal article