| Linear and nonlinear optical properties of Mg doped CdSe quantum dots |
| Paper ID : 1021-ISCHU |
| Authors |
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Abdelrahman Mohamed Ali *1, Gad Mansour1, Amin Fahem1, Mohamed Alkordi2, Mohamed Mansour Elnicklawy1 1Physics department of Faculty of Science helwan university 2Professor of Chemistry and Material Science Zewail city of science and technology |
| Abstract |
| Linear and nonlinear optical properties of Mg-doped CdSe quantum dots were investigated. The quantum dots samples were synthesized using co-precipitation method in aqueous solution. The phase purity and crystal structure of the investigated quantum dots samples were characterized using X- ray Diffraction (XRD) technique. The grain size of the prepared samples found to be in the range 2-4 nm by Transmission Electron Microscope (TEM). UV-visible-IR absorption spectroscopy was used to study the linear, nonlinear optical properties and semiconducting properties from the absorption and transmission spectra. The results reveal that the calculated linear refractive index, extinction coefficient and bandgap of the Mg-doped CdSe quantum dots samples were found to vary with increasing Mg dopant concentration. Furthermore, the nonlinear refractive index and third-order nonlinear optical susceptibility were determined. A substantial modification in both the linear and nonlinear optical parameters was measured for the Mg-doped quantum dots. It is concluded that the slightly doping of Mg ions within the CdSe semiconducting matrix quantum dots resulted in significant changes in their linear and nonlinear optical and electronic band structure properties which open avenues for specialized applications such as all-optical signal processing, photodetectors, photovoltaics as well as provide insights into the consequence of dopants on light-matter interaction in these semiconductor nanocrystals. |
| Keywords |
| Optoelectronic, Co-precipitation, quantum dots, (XRD), (TEM), photoluminescence spectroscopy, refractive indices, complex dielectric constant, and third-order nonlinear optical susceptibility |
| Status: Abstract Accepted (Oral Presentation) |