Elektronik ve Haberleşme Mühendisliği Bölümü Yayın Koleksiyonu
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Correction Uniform Theory for the Diffraction of Evanescent Plane Waves: Publisher's Note (Vol 24, Pg 2426, 2007)(Optical Soc Amer, 2007) Umul, Yusuf Z.Article Citation - WoS: 34Citation - Scopus: 37Diffraction of Evanescent Plane Waves by a Resistive Half-Plane(Optical Soc Amer, 2007) Umul, Yusuf Z.Diffraction of evanescent plane waves by a resistive half-plane is examined. The scattering integrals are constructed with the modified theory of physical optics. These integrals are evaluated uniformly by using an unusual method. The scattered fields of evanescent waves are obtained by giving the angle of incidence a complex value. The diffracted waves are plotted numerically for different parameters of the incident field. (c) 2007 Optical Society of America.Article Citation - WoS: 19Citation - Scopus: 19Scattering of a Gaussian Beam by an Impedance Half-Plane(Optical Soc Amer, 2007) Umul, Yusuf Z.The diffraction of a Gaussian beam by an impedance half-plane is studied through the method of the modified theory of physical optics. An electric line source, which is defined in the complex space, is used to represent the Gaussian beam. The uniform evaluation of the diffraction integral is performed and the scattering patterns of the field are investigated for various numerical parameters of the incident wave. (c) 2007 Optical Society of America.Article Citation - WoS: 7Citation - Scopus: 9Rubinowicz Transform of the Mtpo Surface Integrals(Elsevier Science Bv, 2008) Umul, Yusuf Z.The surface integral of the modified theory of physical optics is reduced to a line integral by using the Rubinowicz transform for the incident scattered fields by an arbitrary aperture in a black surface. The integral theorem of Kirchhoff is applied to the scattering geometry and the diffracted fields are expressed in terms of a line integral along the contour of the diffracting edge. (C) 2008 Elsevier B.V. All rights reserved.Article Citation - WoS: 11Citation - Scopus: 11Effect of the Shadow Geometry in Wedge Diffraction(Optica Publishing Group, 2009) Umul, Yusuf Z.The surface integrals of the modified theory of physical optics are divided into two parts for diffraction by a wedge. Each integral represents the incident or reflected field scattered by one of the faces of the wedge. The results are investigated numerically and compared with the uniform theory of diffraction. (C) 2009 Optical Society of AmericaArticle Citation - WoS: 25Citation - Scopus: 6Improved Equivalent Source Theory(Optical Soc Amer, 2009) Umul, Yusuf Z.The equivalent source theorem, which is an important technique in the study of radiation and scattering by apertures, is improved by using the two axioms of the modified theory of physical optics. The method is applied to the problem of radiation of electromagnetic waves by a parallel plate waveguide. The results are investigated numerically. (C) 2009 Optical Society of AmericaArticle Citation - WoS: 2Citation - Scopus: 3Wedge Diffraction in Terms of the Method of Physical Optics(Ieice-inst Electronics information Communications Eng, 2009) Umul, Yusuf Z.The method of physical optics is extended for wedge diffraction. The classical integral of physical optics is taken into account for the diffraction problem of plane waves by a conducting half-plane. The integral is decomposed according to the transmitted and reflected scattered waves. The sinusoidal term in the integrand is rewritten by considering the fact that the half-plane is a special case of the wedge. Two cases of soft and hard surfaces are examined and the uniform diffracted waves are obtained by the asymptotic evaluation of the integrals. The results are compared with the literature numerically.Article Citation - WoS: 14Citation - Scopus: 15Closed Form Series Solution of the Diffraction Problem of Plane Waves by an Impedance Half-Plane(Iop Publishing Ltd, 2009) Umul, Yusuf Z.The scattering problem of plane waves by an impedance half-plane is solved by using the method of separation of variables, and a closed form series expression, which separately reduces to the cases of soft and hard half-planes, is obtained. The results are investigated numerically and compared with the solutions in the literature.Article Citation - WoS: 3Citation - Scopus: 4General Formulation of the Edge-Diffracted Paraxial Waves(Elsevier Sci Ltd, 2009) Umul, Yusuf Z.A general formula for edge-diffracted paraxial waves is derived in terms of the Fourier integral transform. It is observed that the scattered paraxial wave can be divided into components of the geometrical optics and diffracted fields in the spectral domain. An edge-diffracted Gaussian beam is examined numerically as an application of the formula. (C) 2008 Elsevier Ltd. All rights reserved.Article Citation - WoS: 15Citation - Scopus: 15Effect of the Shadow Geometry on Diffraction(Optical Soc Amer, 2008) Umul, Yusuf Z.The effect of the scatterer surface on the shadow region is examined by using the surface integrals of the modified theory of physical optics. It is shown that the shadow geometry has a considerable effect on the structure of the edge diffracted waves. The diffracted fields for the illuminated and shadowed surface of a half-plane are evaluated in terms of Fresnel integrals and plotted numerically. (C) 2008 Optical Society of America
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