Accepted

Articles recently accepted for publication:

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Exploring Zinc Oxide/Cerium Oxide/Indium Tin Oxide Nano Structures as LEDs: An Optical and Structural Investigation

Zehraa Najim Abdul-ameer

Multilayer optoelectronics devices play a crucial role due to their ability to combine the novel properties of dissimilar materials for superior performance leading to enhanced or novel functionalities .This study focuses on designing, fabricating and characterizing a novel nano multilayer structure of Zinc Oxide /Cerium Oxide/ITO in a simple chemical method. X-ray diffraction (XRD) and scanning electron Microscopy (SEM), UV-visible, and photoluminescence were investigated. Optical properties revealed two wide band gap of 3.15 eV for prepared multilayer structure. The multilayer device exhibit broad Photoluminescence peak at 340 eV .Results show significant improvements in charge carrier, optical absorption and quantum efficiency. Addition of Cerium layer enhance conductivity and photocurrent of nano structure by facilitating electron-hole pair separation under photo excitation. These findings highlight the importance of the prepared nano structure multilayer in various optoelectronic technologies such as photodetectors, sensors and light  emitting diodes.

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Power Flux in a Three-Layer Slab Waveguide with Graphene Interfaces and a Metamaterial Core

Nawal .N. Amsir and Hassan. A. Yasser

This paper presents a theoretical study of the electromagnetic wave propagation in a three-layer slab waveguide with a metamaterial core and graphene interfaces on each end. The dispersion relation, field distribution, and power-flux expressions are then analytically formulated to obtain the impact of the magnetic permeability of the central layer and graphene Fermi energy on the guided modes. It is found that by changing core permeability, the basic TE 0 mode can be suppressed or allowed, and other higher-order modes can propagate consistently. The analysis of power flux shows how there is forward and backward energy flow, where negative values of the flux show that there is backwards-wave flow in the structure. Moreover, mode confinement and alteration in power distribution within the layers occur with an increase in Fermi energy. It is seen that graphene-metamaterial waveguides have a bright future in terms of reconfigurable photonic platforms, with potential uses in optical communication, slow-light devices, and plasmonic control technologies.

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