Biomedical Engineering Reference
In-Depth Information
Fig. 7.16
Biomimetics of structural colors by structural engineering. (
a
) Nature photonic
structure,
Papilio ulysses
butterfly. (
i
)The
bright blue
wings of
P. ulysses
butterfly resulted from
the mixed colors from different regions of the scales. (
ii
,
iii
) Optical and scanning electronic
micrographs (scale bar: 20
m) showing that the surface of a wing scale of a fairly regular
array of concavities and ridges (
iv
). The concavities reflect
green color
light. (
iv
) UV light
reflected from the ridges. (
v
) The transverse cross section of concavities of 21 alternative cuticle
and air layers with a thickness of
95 nm, which reflect green light consistently (Ref. [
148
]).
