Antireflective Photonic Structure for Coherent Nonlinear Spectroscopy of Single Magnetic Quantum Dots

Abstract

International audienc

Coupling of Quantum Dots with Quantum Wells in a System Based on (Cd,Zn,Mg)Te

“…PL peak of QDs consist of many quite sharp emission lines, as expected for QDs. However, they are not very well resolved which makes them rather similar to wide QW peak at higher energy than to QD peak observed for similar CdTe/(Cd,Mg)Te QDs grown in samples without QWs [20], where resolving individual QDs was not difficult. Most probably, coupling of QDs and QW is responsible by increased broadening of individual QD lines.…”

Coherent dynamics of a single Mn-doped quantum dot revealed by four-wave mixing spectroscopy

“…36,37 To bring the benefits of quantum optics and related tools to solotronics, one first needs to introduce the dopant ion into the QD [38][39][40] and enclose it within a photonic structure to enhance the light-matter coupling. 41,42 Recently, this requirement was fulfilled by molecular beam epitaxy (MBE) of the II-VI semiconductor CdTe, nowadays offering QD systems hosting various magnetic ions 37,43,44 and reliable fabrication of optical microcavities. 45 Nevertheless, the progress in coherent spectroscopy of single excitons in CdTe QDs has been laborious, 22,42 due to the restricted availability of femtosecond laser sources emitting in the visible range.…”

“…41,42 Recently, this requirement was fulfilled by molecular beam epitaxy (MBE) of the II-VI semiconductor CdTe, nowadays offering QD systems hosting various magnetic ions 37,43,44 and reliable fabrication of optical microcavities. 45 Nevertheless, the progress in coherent spectroscopy of single excitons in CdTe QDs has been laborious, 22,42 due to the restricted availability of femtosecond laser sources emitting in the visible range.…”

“…Inspired by that performance-boost, we here go beyond the previously used half-cavity design. 42 We develop full monolithic cavities, choosing the quaternary alloy CdZnMgTe as building material. After having deposited a buffer on the GaAs substrate, a bottom distributed Bragg reflector (DBR) is grown by alternating Mg content between 10% and 50%.…”

“…Then, 4 layer-pairs for the upper DBR are deposited, completing the growth, which increases the light-matter coupling compared to sample studied in Ref. 42 . To further improve the incoupling of the optical excitation and the out-coupling of the optical signals, we attach a solid immersion lens (SIL) made of zirconium oxide on the sample surface.…”