Showing papers by "Ahmed Mehaney published in 2013"

Study of physical parameters on the properties of phononic band gaps

Abstract: In this work, we have introduced a comprehensive study concerning with the effects of some physical parameters on the dispersive properties of 1D phononic crystal (PnC). We have treated the propagation of elastic (in-plane) waves incident normally on 1D PnC. Based on the transfer matrix method, the reflection coefficients are calculated and plotted for the plane waves. We have studied many physical parameters effects on the properties of PnCs such as type of surrounding material, type of composites materials, temperature and propagation of waves in defect structures. Also the phenomenon of local resonance was discussed in this survey. These results can be useful in many applications such as sound suppressions and temperature sensor materials.

Ternary metallic-dielectric photonic crystals within ultraviolet wavelengths

Abstract: In this paper, based on the transfer matrix method, we theoretically study the transmission properties in the ultraviolet (UV) region for a one-dimensional ternary metal-dielectric photonic crystal (MDPC). With the calculated transmission characteristics in the wavelength domain, it can be found that the photonic band gap (PBG) can be significantly enlarged compared to the usual binary dielectric-dielectric photonic crystal (DDPC). The roles played by the related parameters, such as the metal thickness, the angle and the polarization of the incident wave, will be discussed and illustrated. Additionally, different metals or dielectrics in the constituents are taken to examine their possible effects on the PBG.