Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 20: Poster I
HL 20.34: Poster
Tuesday, March 10, 2026, 18:00–20:00, P1
Optimization of quantum dot in nanowire for efficient emission in telecom spectral range — •Tomasz Gzyl1, Giada Bucci2, Valentina Zannier2, Paweł Mrowiński1, Anna Musiał1, Elisa García-Tabarés3, Ileana Florea4, Beatriz Galiana3, Lucia Sorba2, Wojciech Rudno-Rudziński1, and Grzegorz Sek1 — 1Wrocław University of Science and Technology, 50-370 Wrocław, Poland — 2NEST Istituto Nanoscienze CNR and Scuola Normale Superiore, 56127 Pisa, Italy — 3Universidad Carlos III de Madrid, 28903 Getafe, Spain — 4CNRS-CHREA, 06560 Valbonne, France
One of the promising platforms for realization of a single photon source emitting in telecom wavelengths is an InAs(P) quantum dot (QD) embedded in a nanowire (NW), designed to enhance extraction efficiency and directionality of QD emission. Chemical Beam Epitaxy technique is employed to grow the QD within novel zinc-blende InP NW or wurzite InAsP NW. Here, we present numerical simulations of the QD-NW system, using finite-difference time-domain method to find optimal NW geometry for maximal extraction efficiency, within numerical aperture of 0.4 used in experiment and taking into account parameters space limited by the growth technology. To verify the calculations and further guide the growth of optimized structures, we performed micro-photoluminescence measurements as a function of excitation power on samples with different composition and NW shell diameter. The structural quality of the samples was confirmed using Scanning Transmission Electron Microscopy with Energy Dispersive X-ray Spectroscopy.
Keywords: Quantum dots; Nanowires; Telecom; Single photon source; Spectroscopy