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The effect of oil-droplet spheres in photoreceptor cells of some vertebrates is evaluated from model experiments with microwaves (λ =5 mm), using correspondingly enlarged structures of foam materials. Directivity and sensitivity of rods and cones should be enhanced by the sphere-lenses. Wave-optics calculation of excitation of the waveguide modes in the dielectric receptor-cells confirms the experimental results.
Sigurd Pfaffe andGerd Koppelmann
"Light Acceptance Of Retinal Receptors With Oil-Droplet Lenses", Proc. SPIE 0701, 1986 European Conf on Optics, Optical Systems and Applications, (10 July 1987); https://doi.org/10.1117/12.937083
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Sigurd Pfaffe, Gerd Koppelmann, "Light Acceptance Of Retinal Receptors With Oil-Droplet Lenses," Proc. SPIE 0701, 1986 European Conf on Optics, Optical Systems and Applications, (10 July 1987); https://doi.org/10.1117/12.937083