Moth-Eye Nanostructure Antireflection Simulator

Nanophotonics lets engineers sculpt how light reflects, without any absorbing coating at all, purely from geometry smaller than the wavelength of light. This simulator runs a real transfer-matrix optics calculation across a graded stack of thin layers to compare three surfaces: a bare flat interface, a classic single quarter-wave interference coating, and a moth-eye nanocone array whose subwavelength taper builds a continuous effective-index ramp from air to substrate. Switch structures, change the substrate material and wavelength, and watch the reflectance spectrum redraw live — including the point where the nanostructure's period grows too large and the effective-medium approximation collapses into ordinary diffraction.