טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentKonstantin Trotskovsky
SubjectSource Model Technique Analysis of Electromagnetic
Scattering by Surface Grooves and Slits
DepartmentDepartment of Electrical Engineering
Supervisor Full Professor Leviatan Yehuda
Full Thesis textFull thesis text - English Version


Abstract

A computational tool, based on the Source Model Technique (SMT), for analysis of electromagnetic wave scattering by surface grooves and slits is presented. The idea is to use a superposition of the solution of the unperturbed problem and local corrections in the groove/slit region (the grooves and slits are treated as local corrections). In this manner, the solution is obtained in a much faster way than solving the original problem.

The proposed solution is applied to problems of grooves and slits in otherwise planar or periodic surfaces. In the planar surfaces case, the solution of the unperturbed problem is known analytically. In the periodic surfaces case, the solution of the unperturbed problem is obtained numerically using an efficient SMT solution, which employs periodic sources. Grooves and slits of various shapes, both smooth ones as well as ones with edges, empty or filled with dielectric material are considered.

In the groove case, we analyze the scattered field, which can allow, for example, defect detection during fabrication process. In the slit case we mainly focus on the transmission through the slit, a problem which has received a lot of attention recently, particularly in the context of studies of enhanced transmission through sub-wavelength slits. In both cases, the results are verified against previously published data. The advantages of the proposed method over commonly used solution methods such as FEM, FDTD, and Mode-Matching, are discussed.