Anti-Reflection Coating Thickness Calculator

Interactive calculator and graph for determining optimal AR parameters

Anti-Reflection Coating Thickness Calculator

Substrate Material Si
Nitride Si₃N₄
SiO₂
Amorphous Silicon
Gallium Arsenide
Indium Phosphide
Aluminum
Nickel
Chromium
Copper
User Defined Substrate

Index Extinction Coefficient

AR Coating Material Optimal index and thickness
Nitride Si₃N₄
SiO₂
User Defined Film

Index

Wavelength [µm]

Index Value of AR coating material, n1	Extinction Coefficient of AR coating material, k1
Index Value of substrate material, n2	Extinction Coefficient of substrate material, k2
Optimal Thickness for AR coating [µm]	Percent of power reflected at this thickness %

This calculator determines parameter values for AR coatings used in a 2-film, air-ambient system with normal light incidence. First, select your desired substrate material, or provide your own material index parameters with the custom substrate option. Then select the desired AR coating material, or use the optimal index and thickness option to show what material parameters would give 0% reflection with your substrate.

Index values are linear interpolations on the values given in Palik's Handbook of Optical Constants. To view these values in table form, see Tabulated Optical Constants under References -> General Info.