WoS İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12416/8653

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Institution Author: search.filters.institutionAuthor.Umul, YZPublisher: search.filters.publisher.Optical Soc Amer

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Now showing 1 - 3 of 3
  • Article
    Citation - WoS: 37
    Citation - Scopus: 38
    Diffraction by a Black Half Plane: Modified Theory of Physical Optics Approach
    (Optical Soc Amer, 2005) Umul, YZ
    The scattered fields from a black half plane which absorbs all the incoming electromagnetic energy are evaluated by defining a new modified theory of physical optics surface current. This current eliminates the reflected fields, coming from the first stationary point of the reflection integral and only creates a reflected diffracted field. The incident scattered fields are found from the same integral, written for the perfectly conducting half plane. The scattered fields are evaluated by using the stationary phase method and edge point technique. The evaluated fields are plotted numerically. (c) 2005 Optical Society of America.
  • Article
    Citation - WoS: 67
    Citation - Scopus: 67
    Equivalent Functions for the Fresnel Integral
    (Optical Soc Amer, 2005) Umul, YZ
    Fresnel integral is modeled with three equivalent functions. The first function is derived by considering the sum of the first term of the Fresnel integral's asymptotic expansion {(F) over cap (x)} and an exponential function which approaches to infinity at the zero of the Fresnel function's argument and has the properties of a unit step function. The second one is the sum of a unit step function and the transition function defined for the simplified uniform theory of diffraction. The third function considers directly eliminating the infinity coming from (F) over cap (x). The amplitude and the phase of Fresnel integral and its equivalent functions are compared numerically. The result is applied to the modified theory of physical optics solution of the diffraction of edge waves from a half plane problem. (c) 2005 Optical Society of America.
  • Article
    Citation - WoS: 11
    Citation - Scopus: 10
    Modified Theory of the Physical-Optics Approach To the Impedance Wedge Problem
    (Optical Soc Amer, 2006) Umul, YZ
    The problem of a wedge with equal face impedances is examined with a modified theory of physical optics. The surface integral is constructed by use of the impedance boundary condition. The aperture equivalent current is estimated from the behavior of the reflected diffracted field. The integrals obtained are evaluated asymptotically and compared with the exact solution numerically. (c) 2006 Optical Society of America.