Abstract

Using a plane-polarized laser of wavelength λ=543.5 or 441.6 nm and spider silk, we investigated the diffraction of a transparent cylinder of diameter D≈λ–λ∕5 at normal incidence. The measured pattern corresponded well to the one calculated by a rigorous solution of the theory for the problem. The birefringent index and D of the sample could be determined simultaneously. The experimental data of the scattering cross section for D<λ∕4 suggested that the data approached dipole radiation.

© 2005 Optical Society of America

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