Browsing by Keywords "Diffraction"
Now showing items 21-40 of 44
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Inertial imaging with nanomechanical systems
(Nature Publishing Group, 2015)Mass sensing with nanoelectromechanical systems has advanced significantly during the last decade. With nanoelectromechanical systems sensors it is now possible to carry out ultrasensitive detection of gaseous analytes, ... -
Last PhD supervised by Professor Kouyoumjian: Extended UTD by Dr. Buyukdura
(IEEE, 2011)While he is a Professor Emeritus at Ohio State, Professor Kouyoumjian supervised a thesis work by Merih Buyukdura. They first derived a dyadic Green's function for a PEC wedge using spherical wave functions and employed ... -
Lyotropic liquid-crystalline phase of oligo(ethylene oxide) surfactant/transition metal salt and the synthesis of mesostructured cadmium sulfide
(American Chemical Society, 2003)Lyotropic liquid-crystalline (LLC), transition metal salt: oligo(ethylene oxide) nonionic surfactant (CnH2n+1(CH2CH2O)mOH, denoted as CnEOm), systems have been studied by means of diffraction, microscopy, and spectroscopy ... -
Maximizing the signal-to-noise ratio of diverging ultrasonic waves in multiple scattering, attenuating, and diffracting media
(Bilkent University, 2022-09)Diverging wave imaging is an unfocused imaging method in which a diverging beam is transmitted to insonify the entire region of interest. This diverging beam is formed by applying appropriate time delays to each transducer ... -
The method of analytical regularization in the electromagnetic wave scattering by thin disks
(Institution of Engineering and Technology, 2007)We consider the problem of diffraction of an arbitrary electromagnetic wave by a thin disk made from different materials and located in free space. Here we imply a zero- thickness perfectly electrically conducting (PEC) ... -
Multichannel optical diode with unidirectional diffraction relevant total transmission
(Optical Society of American (OSA), 2012)We will show that broadband unidirectional optical transmission with a total transmission maximum inside the band can be obtained for linearly polarized incident waves in the nonsymmetric photonic crystal gratings made of ... -
Numerical diffraction synthesis of 2-D quasioptical power splitter
(IEEE, 2007-06)A new diffraction synthesis method is proposed for computing quasioptical 2-D reflector beam splitters in the E-polarization case. It is a combination of a numerical gradient (NG) optimization and an efficient analysis ... -
On the elemination of infinities in the PO component of equivalent edge currents
(Elsevier, 1993)Equivalent edge currents for the Physical Optics (PO) contribution to the edge diffraction are derived by choosing a proper coordinate system for a half plane. It is seen that these expressions for the PO component are ... -
Optimal image restoration with the fractional Fourier transform
(OSA - The Optical Society, 1998-04)The classical Wiener filter, which can be implemented in O(N log N) time, is suited best for space-invariant degradation models and space-invariant signal and noise characteristics. For space-varying degradations and ... -
Performance assessment of a diffraction field computation method based on source model
(IEEE, 2008-05)Efficient computation of scalar optical diffraction field due to an object is an essential issue in holographic 3D television systems. The first step in the computation process is to construct an object. As a solution for ... -
Projection-slice theorem as a tool for mathematical representation of diffraction
(Institute of Electrical and Electronics Engineers, 2007)Although the impulse (Dirac delta) function has been widely used as a tool in signal processing, its more complicated counterpart, the impulse function over higher dimensional manifolds in ℝN, did not get such a widespread ... -
Propagation of Mutual Intensity Expressed in terms of the Fractional Fourier Transform
(OSA Publising, 1996)The propagation of mutual intensity through quadratic graded-index media or free space can be expressed in terms of two-dimensional fractional Fourier transforms for one-dimensional systems and in terms of fourdimensiona ... -
Reconstruction of scalar diffraction field from distributed data points over 3D space
(IEEE, 2007)Diffraction field computation is an important task in the signal conversion stage of the holographic 3DTV. We consider an abstract setting, where the diffraction field of the desired 3D scene to be displayed is given by ... -
Scalar diffraction field calculation from curved surfaces via Gaussian beam decomposition
(Optical Society of America, 2012-06-29)We introduce a local signal decomposition method for the analysis of three-dimensional (3D) diffraction fields involving curved surfaces. We decompose a given field on a two-dimensional curved surface into a sum of properly ... -
Signal processing issues in diffraction and holographic 3DTV
(Elsevier BV, 2007)Image capture and image display will most likely be decoupled in future 3DTV systems. Due to the need to convert abstract representations of 3D images to display driver signals, and to explicitly consider optical diffraction ... -
Signal processing issues in diffraction and holographic 3DTV
(IEEE, 2005)Image capture and image display will most likely be decoupled in future 3DTV systems. For this reason, as well as the need to convert abstract representations to display driver signals, and the need to explicitly consider ... -
Signal processing problems and algorithms in display side of 3DTV
(IEEE, 2006-10)Two important signal processing problems in the display side of a holographic 3DTV are the computation of the diffraction field of a 3D object from its abstract representation, and determination of the best display ... -
Simulation of scalar optical diffraction between arbitrarily oriented planes
(IEEE, 2004)Scalar optical diffraction between arbitrarily oriented planes for monochromatic waves is analyzed and a simulator based on a discrete model is developed. The model is based directly on the Rayleigh-Sommerfeld diffraction ... -
Simultaneously opening transmission channels with negative and positive phase velocities for the stacked subwavelength apertures in fishnet metamaterials with hybrid unit lattices
(S P I E - International Society for Optical Engineering, 2012-10-05)Hybridization of the unit lattice along the propagation direction was demonstrated to produce a negative-phase-velocity transmission band in the absence of the contributions from the higher diffraction orders for a stacked ... -
Some mathematical properties of the uniformly sampled quadratic phase function and associated issues in digital Fresnel diffraction simulations
(SPIE - International Society for Optical Engineering, 2004)The quadratic phase function is fundamental in describing and computing wave-propagation-related phenomena under the Fresnel approximation; it is also frequently used in many signal processing algorithms. This function has ...
