Anti-Reflecting Nanostructures - Biomimetic Architectures by Plasma Processing - page 47

Figure 2.5 (a) AFM scan and (b) corresponding line scan of corneal nipple

arrays on the facets of moth eye. Periodic array with period
of 200 nm and height around 70 nm has been observed. (c)
Reflection as a function of the incident wavelength from moth
eye facets covered with parabola-shaped corneal nipple arrays.
The dashed line represents the reference for a moth eye facet
without corneal nipples. (d) Respective reflection as a function
of the incident angle: a circularly polarised monochromatic
incident light of wavelength 400 nm was assumed. Reprinted
from Ref. [10] with permission from IOP Publishing, copyright
IOP Publishing (doi:10.1088/1748-3182/7/1/016003).

2.3.3 Surface-Relief Grating AR Surfaces

With the development of the grating theory in the late 20th
century, interest grew in one- (1D) and two-dimensional (2D) 'non-
moth-eye' structures, also known as surface-relief grating or anti-
reflection grating (ARG) [1]. Unlike typical gratings, ARG surfaces are
constructed in such a manner that the surface period dimension is in
SW scale, so all higher diffracted orders are cut off except the zero-
order reflected and transmitted waves, as if the surface behaves like
a non-structured homogeneous medium.
Simple EMT [27,28] can describe the interaction of light with
such SWS by representing the heterogeneity in ARG surface in terms