Two dimensional multistage AOCA system based on generalized equations has been analyzed. Numerical results for
Bragg angle as a function of acoustic frequency, deflection angles for different wavelengths, normalized power and
diffraction efficiency with and without phase shift between consecutive arrays having different channel spacing based on
generalized equations have been obtained.
Fourier modal method for rectangular dot gratings made of anisotropic and conducting materials is reformulated by taking into account Li's Fourier factorization rules. Diffraction efficiencies computed by the present formulation are compared with the conventional one, and numerical results show that convergence of the presented formulation is superior to that of the conventional one.
Lamellar grating type semiconductor periodic waveguides with rectangular cross-section are analyzed numerically using Fourier series expansion method, and the wavelength characteristics of reflected and transmitted powers of both guided and radiation modes are investigated for several values of the groove depth and length of the grating waveguide. Then the effects of the radiation fields are made clear, and the preferred parameters for the stable propagation of the reflected dominant guided mode are recommended.
The reflection and transmission problem of plane wave from periodic arrays of composite cylindrical objects wih internal scatterers using the aggregate T-matrix approach and the lattice sums technique has been studied. The array element per unit cell consists of a circular dielectric cylinder with N parallel eccentric cylindrical inclusions. Reflection characteristics for the asymmetrical proflie in terms of the array plane for the lowest three upgoing and downgoing space harmonics have been investigated. The difference between the upgoing and downgoing space harmonics for the TM wave could be vividly observed.
A rigorous method to analyze the electromagnetic scattering from a layered crossed-arrays of circular cylinders is presented. The crossed arrays consists of a stacking sequence of two orthogonal arrays in which the cylinder axes are rotated by 90° in each successive layer.
A numerical approach for three-dimensional optical waveguides using periodic boundary conditions in both transverse directions is presented. Expanding the electric and magnetic fields in a double Fourier series of complex trigonometric functions, Maxwell's equations are reduced to the eigenvalue problem of a linear system for the Fourier coefficients. The solutions yield the vectorial eigenmode fields for guided and radiation modes, both propagating in forward and backward directions. The method is used to analyze the junction of a fiber to an embedded waveguides and the power transfer between two parallel embedded waveguides.
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