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The behavior of a 2-D model of an extended hemielliptic silicon lens of asize typical for THz applications is accurately studied for the case of a planeE-wave illumination. The full-wave analysis of the scattering problem is basedon the Muller boundary integral equations that are uniquely solvable. Galerkindiscretization scheme with a trigonometric basis leads to a very efficientnumerical algorithm. Numerical results related to the focusability of the lensversus its rear-side extension and the angle of the plane-wave incidence, aswell as near-field profiles, demonstrate strong resonances. Such effects canchange the principles of optimal design of lens-based receivers.

Lens or resonator? - Electromagnetic behavior of an extended hemielliptic lens for a sub-mm wave receiver