Moth Eye Anti-Reflection — Corneal Nipple Array at 8:1
389.00 د.إ
A moth eye at 8:1 optical macro — the anti-reflective corneal nipple array visible as a hexagonally packed nanostructure on each facet surface, the bio-inspired structure that eliminates surface reflection and gives moths superior night vision.
Description
Moth corneas exhibit a naturally occurring anti-reflection surface — a hexagonally packed array of nano-scale protrusions (nipples) approximately 200nm in height and spacing that creates a gradient refractive index transition between air and the corneal material, eliminating the Fresnel reflection that would otherwise occur at the abrupt air-lens interface. This structure, now widely replicated in anti-reflection glass coatings, was first described by Bernhard in 1967 in the moth eye. At 8:1 optical macro magnification, the facets of a moth compound eye are resolved individually, and the corneal surface texture — the nipple array — modifies the reflection character of each facet relative to a smooth surface: rather than reflecting a bright highlight at the specular angle, the nipple-array-covered facets scatter light diffusely without producing a focused reflection. The absence of reflection from the moth eye in this image, compared to the bright catchlights that would be visible from a smooth insect eye, visually demonstrates the anti-reflection effectiveness of the nanostructure.
