PubMed İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8650
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Browsing PubMed İndeksli Yayınlar Koleksiyonu by Institution Author "Umul, Yusuf Ziya"
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Article Citation - WoS: 4Citation - Scopus: 4Beam Diffraction by a Resistive Half-Plane(Optical Soc Amer, 2015) Umul, Yusuf ZiyaThe scattering of a Gaussian beam by a resistive half-screen is investigated. Far-field approximation is used in evaluation of geometrical optics and diffracted waves. The uniform expression of the diffracted waves by the resistive half-plane, which was found with the Sommerfeld-Maliuzhinets method, is obtained. The scattered fields for the case of the beam incidence are evaluated with the technique of a complex point source. The resultant wave expressions are examined numerically. (C) 2015 Optical Society of AmericaArticle Citation - WoS: 4Citation - Scopus: 4Diffraction of Plane Electromagnetic Waves by a Resistive Half-Screen for Skew Incidence(Optical Soc Amer, 2020) Umul, Yusuf ZiyaThe scattering process of electromagnetic plane waves by a resistive half-screen is investigated for oblique incidence. First of all, it is shown that the existing solution in the literature is not correct, because the problem was solved by considering the normal components of the electromagnetic field, in terms of which the boundary conditions cannot be expressed. Instead of these, the components of the electric field, which is parallel to the edge discontinuity, are taken into account. The diffracted fields are obtained with the aid of the method of transition boundary. The uniform field expressions are obtained by using the Fresnel function. The behaviors of the total field and its subcomponents are analyzed numerically. (C) 2019 Optical Society of AmericaArticle Citation - WoS: 13Citation - Scopus: 12Diffraction of Waves by a Boundary Between Two Half-Planes With Different Resistivities(Optical Soc Amer, 2015) Umul, Yusuf ZiyaThe solution of the diffraction problem of waves by a junction between two resistive half-screens is obtained by using the wedge diffraction field expression, introduced by Maliuzhinets [Ann. Phys. 461, 107 (1960)]. The two half-planes, located at the same coordinate plane, have different surface resistivities. The new field expression is compared with the solution of Senior ["Diffraction by a material junction,"http://deepblue.lib.umich.edu/handle/2027.42/21043] for the scattered waves. The important aspects of the approach are discussed in the light of the numerical results. (C) 2015 Optical Society of AmericaArticle Citation - WoS: 5Citation - Scopus: 4Interaction of Electromagnetic Plane Waves With an Impedance Half-Plane in an Anisotropic Medium(Optical Soc Amer, 2020) Umul, Yusuf ZiyaThe diffraction process of electromagnetic plane waves by an impedance half-plane in anisotropic medium is investigated. In this case, the permittivity of the space is expressed in terms of a tensor. The incident wave is considered for magnetic polarization. The diffracted fields are obtained with the aid of the method of transition boundary. It is shown that the diffraction wave reduces to the correct field expressions for the limiting cases. The total field and its components are compared with the literature numerically. (C) 2020 Optical Society of AmericaArticle Citation - WoS: 9Citation - Scopus: 10Physical Optics Theory for the Diffraction of Waves by Impedance Surfaces(Optical Soc Amer, 2011) Umul, Yusuf ZiyaThe solution of the scattering problem of waves by a half-screen with equal face impedances, which was introduced by Malyughinetz, is transformed into a physical optics integral by using the inverse edge point method. The obtained integral is applied to the diffraction problem of plane waves by an impedance truncated circular cylinder and the scattered waves are derived asymptotically. The results are examined numerically. (C) 2011 Optical Society of AmericaArticle Citation - WoS: 3Citation - Scopus: 4Physical Optics-Based Diffraction Coefficient for a Wedge With Different Face Impedances(Optical Soc Amer, 2018) Umul, Yusuf ZiyaA new diffraction field expression is introduced with the aid of the modified theory of physical optics for a wedge with different face impedances. First, the scattered geometrical optics fields are determined when both faces of the wedge are illuminated by the incident wave. The geometrical optics waves are then expressed in terms of the sum of two different fields that occur for different impedance wedges. The diffracted fields are determined for the two cases separately, and the total diffracted field is obtained as a sum of these waves. Lastly, the uniform field expressions are obtained, and the resultant fields are numerically compared with the solution of Maliuzhinets. (C) 2018 Optical Society of AmericaArticle Citation - WoS: 33Scattering by a Conductive Half-Screen Between Isorefractive Media(Optical Soc Amer, 2015) Umul, Yusuf ZiyaThe scattering process of electromagnetic waves by a conductive half-plane, located between isorefractive media, is investigated. First, the conductive sheet at the interface of isorefractive media is considered. The reflection and transmission coefficients of the plane are evaluated. The diffracted fields by the half-plane are obtained with the aid of a relation between the diffracted and scattered geometrical optics waves. The resultant field expressions are numerically examined. (C) 2015 Optical Society of AmericaArticle Citation - WoS: 2Citation - Scopus: 2Scattering of Inhomogeneous Plane Waves by a Resistive Half-Screen(Optical Soc Amer, 2013) Umul, Yusuf ZiyaThe scattering process of inhomogeneous plane waves by a resistive half-plane is investigated by using the exact diffracted field expressions. The uniform field representations are obtained with the aid of the uniform theory, put forward by Umul. The geometrical optics and diffracted and scattered fields are examined numerically. (C) 2013 Optical Society of AmericaArticle Citation - WoS: 17Citation - Scopus: 18Wave Diffraction by a Reflectionless Half-Plane(Optical Soc Amer, 2017) Umul, Yusuf ZiyaThe concept of reflectionless surface is put forth, and its reflection and transmission coefficients are determined by using the scattered geometrical optics fields of transmissive and perfectly electric conducting surfaces. The boundary condition of the surface is introduced. The scattering problem of plane waves by a reflectionless half-screen is studied. The solution is investigated numerically. (C) 2017 Optical Society of America
