The behavior of a 2D model of an extended hemielliptic silicon lens of a size typical for THz applications is accurately studied for the case of a plane E‐wave illumination. The full‐wave analysis of the scattering problem is based on the Muller's boundary integral‐equations (MBIE) that are uniquely solvable. A Galerkin discretization scheme with a trigonometric basis leads to a very efficient numerical algorithm. The numerical results related to the focusability of the lens versus its rear‐side extension and the angle of the plane‐wave incidence, as well as near‐field profiles, demonstrate strong resonances. Such effects can change the principles of optimal design of lens‐based receivers.
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Boriskin et al. (2004) studied this question.
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