The interaction of light with PC grains of different
orientations alters the individual bright colorations leading
to the loss of iridescence and a matt coloration perceived in
the far-field. The interaction of light with PC grains of
different orientations alters the individual bright colorations
leading to the loss of iridescence and a matt coloration
perceived in the far-field. Each PC grain gives rise to a
bright color which depends on the crystal orientation and on
the incidence angles. Pachyrrynchus congestus pavonius, a
weevil from Philippines, presents a very similar photonic
structure in its scales (producing an orange coloration) but
the PC grains are smaller (about 1500 μm2). The average
scale thickness is 2.20 μm (± 0.25 μm).