in this paper, using annular resonator we have designed an adding and dropping filter light based ontwo-dimensional photonic crystals. the shape of ring resonator filter adding and dropping that wehave proposed is race track. this filter has a hexagonal lattice structure of silicon bars withrefractive index 3/46 that is located in the context of air with refractive index 1. transmissionefficien...

With the rapid growth of indoor wireless communication systems, the need to accurately model radio wave propagation inside the building environments has increased. Many site-specific methods have been proposed for modeling indoor radio channels. Among these methods, the ray tracing algorithm and the finite-difference time domain (FDTD) method are the most popular ones. The ray tracing approach ...

The neutrino oscillation phenomenon has been discussed in the case of neutrinos propagating in a flat space–time both in the plane wave approach for highly relativistic neutrinos [1] and in the wave packet formalism [2]. In this note we present a generalization of the plane wave approach to the case of curved space–time [3–5]. In order to generalize the plane–wave approach to the case of a curv...

We study the properties of the chaotic wave fields generated in the frame of the SasaSatsuma equation when a plane wave solution is randomly perturbed with a white noise. We have found that plane waves with different propagation constant splits into selffocused filaments, that propagate with a velocity which is well approximately given by the group velocity calculated from the dispersion relati...

In this doctoral thesis we study zero-mode spectra of Matrix theory and eleven-dimensional supergravity on the plane-wave background. This background is obtained via the Penrose limit of AdS4 × S7 and AdS7 × S4. The plane-wave background is a maximally supersymmetric spacetime supported by non-vanishing constant four-form flux in eleven-dimensional spacetime. First, we discuss the Matrix theory...

The paper deals with surface wave propagation in an orthorhombic elastic half-plane. The general profile of the wave is considered, incorporating the anisotropy effects within the known representation in terms of a single plane harmonic function.

The multi-chamber reactive silencers are widely used to reduce engine exhaust noise as well as blower intake and discharge noise. Davis et al. [1] developed a one-dimensional analytical approach, which assumes plane wave propagation in the axial direction in silencers, to predict the acoustic attenuation performance of double expansion chamber reactive silencers, and compared the predictions wi...

We discuss “the plane wave approximation” to quantum mechanical scattering using simple onedimensional examples. Our central claims are that (a) the plane waves of standard calculations can and should be thought of as very wide wave packets, and (b) the calculations of reflection and transmission probabilities R and T in standard textbook presentations involve an approximation which is almost n...

A two-block X-ray Fresnel zone plate system forms two-beams - a plane wave and a spherical wave - which interfere at the focal distance of the virtual source of the spherical wave. An object placed in the path of the plane wave forms an object wave and the spherical wave is the reference wave. The recorded intensity distribution is the Fourier transform hologram of the object. Analytical and nu...

In this paper using nested Rectangular resonator we have designed an add-drop filter based on photonic crystal structures suitable for optical communication applications. The drop efficiency and the quality factor of our proposed filter is 100% and 2508. In this filter the quality factor is significantly improved with respect to other published reports. The simulation results are obtained using...