Premium
Single‐photon and photon‐pair emission from CdSe/Zn(S,Se) quantum dots
Author(s) -
Ulrich S. M.,
Sebald K.,
Michler P.,
Passow T.,
Hommel D.,
Bacher G.,
Forchel A.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200303060
Subject(s) - quantum dot , biexciton , photon , exciton , polarization (electrochemistry) , physics , excitation , atomic physics , molecular physics , materials science , optoelectronics , condensed matter physics , optics , chemistry , quantum mechanics
Abstract We report on the generation of triggered single photons and photon pairs relying on pulsed optical excitation of epitaxially grown self‐assembled CdSe quantum dots (QDs). Single‐photon emission is studied on individual CdSe/Zn(S,Se) QDs for temperatures up to 200 K. At low temperatures nearly perfect single‐photon emission is achieved whereas at higher temperatures an increasing multi‐photon emission probability due to spectrally overlapping acoustic phonon sidebands of neighboring QDs is observed. The multi‐photon emission probability of a bare QD (background subtracted) is strongly suppressed. Furthermore, the polarization cross correlation of the biexciton–exciton cascade has been investigated in a CdSe/ZnSe QD at low temperatures. A strong polarization correlation of the emitted photon pairs of ∼74% is observed in a linear detection basis.