In this paper, we investigated the transient electron population and the transient behaviour of the dispersion, absorption and refractive property of weak probe light in a four-level InGaN/GaN quantum dot nanostructure. In order to achieve the wave functions and their corresponding energy levels of the mentioned quantum dot nanostructure, the Schrödinger and Poisson equations is solved selfconsistently for carriers (here electron) in quantum dot. Our findings show that the properties of transient processes can be dramatically affected by parameters such as intensity, detuning and relative phase of applied fields. Our proposed scheme provides a realistic model for transient control of refraction index properties in a quantum dot nanostructure. These results may have potential applications in high speed optical switch for quantum information technologies.
Effects of particle size and weight percentage of heavy metal elements on photon shielding efficiency of reinforced polymer composites INTRODUCTION Many researches worldwide have been conducted to find new materials and compounds as alternatives to traditional shielding materials. These researchers have developed polymer micro/nano composites using non lead metals for radiation shielding applications. Polymer composites when reinforced with heavy metal in form of micro/nano particles provides many advantages including cost-effectiveness, light weight factor, flexibility, non-toxicity, conformability, etc. over conventional materials. Many researchers have studied the effects of the type, weight percentages and particle size of radiation absorbing materials on the radiation shielding properties for X-ray, gamma and neutron attenuation (1-5). Botelho et al. (2011) compared the micron and nano size of CuO on the X-ray absorption
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