Akademik Veri Yönetim Sistemi
Micro and Nanostructures, cilt.216, 2026 (SCI-Expanded, Scopus)
In this work, electronic and optical properties of asymmetric spiral shaped GaAs/AlGaAs quantum wires (QWs) are systematically investigated as a function of spiral thickness ξ and externally applied electric field (EF). The confinement potential is constructed based on the spiral geometry, and the time-independent Schrödinger equation is solved within the effective mass approximation using the finite difference method (FDM). The results reveal that spiral QWs exhibit a highly tunable broadband nonlinear optical response, with resonance energy shifts in a range of 0-16 meV. The dipole moment matrix elements (DMME) product shows an extended response between ξ=2.1nm and ξ=2.7nm under zero EF. Within this range, an exceptionally high THG coefficient of 8.167×10−10m2/V2 is achieved, compared to conventional bulk semiconductors, quantum wells, and quantum dots. Furthermore, by fixing ξ=2.5nm, the THG spectrum can be effectively tuned via external EFs without significant loss in amplitude. Comparable THG strengths are obtained for both positive and negative EF polarities, accompanied by controllable red- and blue-shifts of the resonance peak. These findings demonstrate that spiral QWs provide a highly efficient and electrically tunable platform for strong THG, highlighting their potential as compact direct THz and long-infrared sources as absorbers/emitters for future photonic device integration.