Field intensity distribution by a cylindrical Plano convex lens placed in a homogeneous un-magnetized plasma meida

摘要

A theoretical investigation has been carried out to analyze the optical focusing electromagnetic field by a Plano convex lens place in an isotropic un-magnetized plasma environment. Derived geometrical optics field is valid everywhere except at focal point where it gives infinite value. Singularity of the field at focal point is addressed using Maslov's method. The effect of the physical parameters such as the plasma electron density, the angle of incidence and the effective collisional frequency have been observed to have an evident influence on the levels of the transmitted field-intensities along the focal region. The problem discussed in this paper has been, also, solved using Kirchhoff's approximation and the results of the two methods are in a good agreement.