This project is within the field of semiconductor spintronics that promises realization of spin-based active components for electronic circuits. The objective of the present project, supported by the Carl Trygger Foundation: CTS 21:1583: "Study of electronic focusing lens embedded in semiconductor nanodevices", is to investigate theoretically spin polarization and spin-dependent electron transport through electronic lens embedded in a wide quantum wire (QW) fabricated in GaAs/AlGaAs heterostructure. The experimental setup consists of three quantum point contacts (QPCs), with two of them functioning as spin injectors and the third acting as a spin detector. The main aim of this research is to study the possibility of implementing an electronic lens within a QW with shallow confinement, using an experimentally proposed electron focusing device that incorporates an asymmetrically loaded QPC. Spin-dependent transport through this asymmetrically loaded QPC is tested by the electronic lens and the spin detector QPC. . Theoretical study of electron transport through a lens area is based on density functional theory (DFT). For this purpose, we have implemented an algorithm based on the Kohn-Sham local spin density approximation (LSDA) model and adapted it for a parallel high-performance cluster with distributed memory at the National Supercomputer Center in Linköping.