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The field structure and the total energy inside a thin hollow lossless dielectric cylinder has been studied numerically for normal incidence of collimated TM waves. The dependence of the field structure and the total energy on the optical thickness and the inner radius of the cylinder and on the refractive index of the cylinder material has been discussed. It has been shown that optimization of various parameters may lead to a localized peak of high relative intensity and also a high concentration of energy inside the cylinder.
