The structural composition and its influence on the optical properties of gold black

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Abstract
A model is developed for the optical properties of gold black within the realm of effective medium theory. This model assumes that the strands of gold black can be approximated by spheroids for which the depolarization factor is well known from electrostatic theory. This model is applied to several gold blacks produced by inert‐gas evaporation. It is found that excellent agreement between experimental and theoretical transmittance can be achieved in the solar spectrum using a distribution of spheroids (gold black strnads) that is closely approximated by a log‐normal function. Experimental results for packing factor and sample thickness were used without modification. Experimental data for the electron collision frequency was modified to account for particle size effects.

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