optical properties – Page 2 – TechConnect Briefs

Synthesis of nanocrystalline (Zn1-xCox)Al2O4 solid solution: structural and optical properties

Fernández-Osorio A., Hernández- Mendoza D., Pineda-Villanueva E., Universidad Nacional Autonoma de Mexico, MX

New inorganic pink pigments based on nanocrystalline (Zn1-xCox)Al2O4 solid solution, were prepared using the hydrothermal method, obtaining nanoparticles below 8 nm. The spinel ZnAl2O4 was chosen as host hue to introduce Co(II) ions, because zinc [...]

The INGAAS/GAAS Quantum Dots Under Effective and Ab Initio Treatments: Comparison and Results

Filikhin I., Suslov V.M., Vlahovic B., North Carolina Central University, US

An effective approach for describing the electronic structure of InGaAs/GaAs quantum dots (QDs) is presented. We model QDs based on a single sub-band approach with an energy dependent electron effective mass. The model assumes that [...]

Quantum Design of Complex Nanostructured Electronic Materials

Williamson A.J., Lawrence Livermore National Laboratory, US

Over the last decade, our ability to predict the fundamental properties of nanoscale building blocks such as quantum dots, wires, and slabs has improved dramatically. In particular, first principles modeling techniques can now routinely predict [...]

Numerical Modelling of Experimentally Fabricated Inas/Gaas Quantum Rings

Filikhin I., Deyneka E., Vlahovic B., North Carolina Central University, US

In the presented work we apply a single subband model for InAs/GaAs QD(QR), where the electron effective mass depends on the confinement energy by the Kane formula. The geometrical parameters of the model are based [...]

Qubit Entanglement from a Bipartite Atomic System in a Carbon Nanotube

Bondarev I.V., Vlahovic B., North Carolina Central University, US

The development of materials that may host quantum coherent states is a critical research problem for the nearest future. Important would be to demonstrate quantum information transfer between two quantum bits arbitrarily separated in the [...]

Size Related Contribution to Electron Energy of the Quantum Ring

Filikhin I., Deyneka E., Melikian H.M., Vlahovic B., North Carolina Central University, US

The semiconductor quantum ring (QR) is studied under energy dependent effective mass approximation. The 3D ground state (confined) energy problem is solved numerically by the finite element method in a single subband approach. We obtained [...]

Nano-Crystalline Ta2O5 Films Deposited by DC Pulsed Magnetron Sputtering

Ligatchev V., Rusli E., Keng L-B, Khuen L-F, Rumin Y., Zhao J., Nanyang Technological University, SG

Thin Ta2O5 layers (95 - 110 nm), deposited at room temperature using pulsed DC magnetron sputtering (PDCMS) in an argon-oxygen (Ar-O2) gas mixture, are investigated. The Ta2O5 samples were prepared at different Ar/O2 flow ratios [...]

Numerical Simulations of Residual Stresses and Their Effects on Electronic Properties in Quantum Dots

Vlahovic B., Suslov V., Wang K., North Carolina Central University, US

A finite element method has been utilized to simulate the residual stress distributions in the quantum dots. Both lattice mismatch and thermal expansion effects are included. Our calculation indicates that the residual stresses concentrate at [...]