Wojciech Pacuski - Antireflective photonic structure for coherent nonlinear spectroscopy of single magnetic quantum dots

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      Publication Details (including relevant citation   information):

      W. Pacuski, J.-G. Rousset, V. Delmonte, T. Jakubczyk, K. Sobczak,   J. Borysiuk, K. Sawicki, E. Janik, J. Kasprzak, Cryst. Growth   Des. 17, 2987 (2017).


      This work presents epitaxial growth and optical spectroscopy of   CdTe quantum dots (QDs) in (Cd,Zn,Mg)Te barriers placed on top of   the (Cd,Zn,Mg)Te distributed Bragg reflector. The photonic mode   formed in our half-cavity structure permits enhancement of the   local excitation intensity and extraction efficiency of the QD   emission, while suppressing the reflectance within the spectral   range covering the QD transitions. This allows us to perform   coherent, nonlinear, resonant spectroscopy of individual QDs. The   coherence dynamics of a charged exciton is measured via four-wave   mixing, with the estimated dephasing time T2 = (210 ± 40) ps. The   same structure contains QDs doped with single Mn2+ ions, as   detected in photoluminescence spectra. Our work therefore paves   the way toward investigating and controlling coherence of   individual excitons coupled, via s,p-d exchange interaction, with   individual spins of magnetic dopants.

      Address (URL): http://pubs.acs.org/doi/abs/10.1021/acs.cgd.6b01596