Abstract
An idealized visual pigment absorbance spectrum is used together with a Kramers-Kronig dispersion relation to calculate the contribution of the visual pigment to the refractive index of the fly photoreceptor. It appears that an absorption coefficient of 0.010 μm −1 results in a refractive index variation of less than 5 × 10 −4. The effect of this small variation on waveguide properties of the fly photoreceptor is found to be negligible. It is argued that this conclusion also holds for other visual photoreceptors.
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