Bonn 2025 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 49: Poster – Photonics, Lasers, and Applications
Q 49.39: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Coherent Control in Size Selected Semiconductor Quantum Dot Thin Films — •Victor Kärcher1, Tobias Reiker1, Pedro F. M. G. da Costa2, Andrea S. S. de Camargo3, and Helmut Zacharias1 — 148149, Münster, Uni Münster — 2São Carlos Institute of Physics, University of São Paulo, São Carlos - SP 13566-590, Brazil, — 3Federal Institute for Materials Research and Testing (BAM), 12489 Berlin
We introduce a novel technique for coherent control that employs resonant internally generated fields in CdTe quantum dot (QD) thin films at the L-point. The bulk band gap of CdTe at the L-point amounts to 3.6 eV, with the transition marked by strong Coulomb coupling. Third harmonic generation is used to control quantum interference of three-photon resonant paths between the valence and conduction bands. Different thicknesses of the CdTe QDs are used to manipulate the phase relationship between the external fundamental and the internally generated third harmonic, resulting in either suppression or strong enhancement of the resonant third harmonic, while the non-resonant components remain nearly constant. This development could pave the way for new quantum interference based applications in ultrafast switching of nanophotonic devices.
Keywords: Coherent Control; Quantum Interference; Quantum Dots; Thin Films; Third Harmonic Generation