Browsing by Keywords "Physical optics"
Now showing items 112 of 12

Asymptotic wavelike modeling of dielectric lenses
(2007)We propose asymptotic wavelike approximations for the accurate modeling of dielectric lenses used in quasioptical systems of millimeter, submillimeter, and infrared wave applications. For the comparison, we obtain an ... 
Effect of disorder on magnetic resonance band gap of splitring resonator structures
(Optical Society of American (OSA), 2004)We investigated the influence of periodicity, misalignment, and disorder on the magnetic resonance gap of splitring resonators (SRRs) which are essential components of left handedmetamaterials (LHMs). The resonance of a ... 
EFIE and MFIE, why the difference?
(2008)EFIE (electric field integral equation) suffers from internal resonance, and the remedy is to use MFIE (magnetic field integral equation) to come up with a CFIE (combined field integral equation) to remove the internal ... 
Large flat plate models in the physical optics method for RCS calculations
(2004)The calculation of Radar Cross Section (RCS) of arbitrarily large perfectly conducting body is presented. The body is modelled as triangular meshes of any size by the help of graphical tools. For the calculation of scattered ... 
Largescale solutions of electromagnetics problems using the multilevel fast multipole algorithm and physical optics
(Bilkent University, 201504)Integral equations provide fullwave (accurate) solutions of Helmholtztype electromagnetics problems. The multilevel fast multipole algorithm (MLFMA) discretizes the equations and solves them numerically with O(NLogN) ... 
Memoryefficient multilevel physical optics algorithm for fast computation of scattering from threedimensional complex targets
(2007)Multilevel physical optics (MLPO) algorithm provides a speedup for computing the physicaloptics integral over complex bodies for a range of aspect angles and frequencies. On the other hand, when computation of the RCS ... 
Memoryefficient multilevel physical optics algorithm for the solution of electromagnetic scattering problems
(Bilkent University, 2007)For the computation of electromagnetic scattering from electrically large targets, physical optics (PO) technique can provide approximate but very fast solutions. Moreover, higher order approximations, such as physical ... 
Microcavity effects in the photoluminescence of hydrogenated amorphous silicon nitride
(1998)FabryPerot microcavities are used for the alteration of photoluminescence in hydrogenated amorphous silicon nitride grown with and without ammonia. The photoluminescence is rednearinfrared for the samples grown without ... 
Multilevel PO algorithm for nonuniform triangulations
(2006)Fast physical optics (FPO) algorithm provides a speedup for computing the physical optics (PO) integral over complex bodies for a range of aspect angles and frequencies. In this paper, this algorithm is further developed ... 
Physical optics modeling of 2D dielectric lenses
(Optical Society of America, 20090127)We propose an advanced physical optics formulation for the accurate modeling of dielectric lenses used in quasioptical systems of millimeter, submillimeter, and infrared wave applications. For comparison, we obtain an ... 
POMLFMA hybrid technique for the solution of electromagnetic scattering problems involving complex targets
(2007)The multilevel fast multipole algorithm (MLFMA) is a powerful tool for efficient and accurate solutions of electromagnetic scattering problems involving large and complicated structures. On the other hand, it is still ... 
Structural analysis of an InGaN/GaN based light emitting diode by Xray diffraction
(Springer, 20090418)The important structural characteristics of hexagonal GaN in an InGaN/GaN multi quantum well, which was aimed to make a light emitted diode and was grown by metalorganic chemical vapor deposition on cplain sapphire, are ...