Spectrum & Utilities

Single-Layer AR Coating

Optimum refractive index and thickness (QWOT) of a single-layer antireflection coating.

n₁ = √(n₀nₛ), d = λ₀ / 4n₁

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Result

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Variables and units	Unit	Default
Residual reflectance R	%
Film refractive index n₁	—	1.38
Substrate refractive index nₛ	—	1.52
Ambient refractive index n₀	—	1
Design wavelength λ₀	nm	550
Physical thickness d	nm	99.6

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