Berlin 2018 – scientific programme
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O: Fachverband Oberflächenphysik
O 77: Poster: Plasmonics and Nanooptics
O 77.21: Poster
Wednesday, March 14, 2018, 18:15–20:30, Poster A
Photon Correlation Measurements on Quantum Dots — •Lok-Yee Yan, Manuel Peter, and Stefan Linden — Physikalisches Institut, University of Bonn, Nußallee 12, D-53115 Bonn, Germany
Semiconductor quantum dots (QDs) can be used as single photon emitters
in various applications. In our group we have developed a lithographic
method that allows us to deposit a controllable number of colloidal semiconductor QDs
on freely definable sites on the substrate. Lately, we improved this method to the reliable placement of single QDs which could be confirmed by electron micrographs.
In order to demonstrate photon-antibunching of the fluorescence
of a single QD, we are performing a Hanbury-Brown-Twiss
experiment (HBT) which leads to the direct measurement of the second-order correlation function g(2)(τ).
In the HBT the fluorescence is divided by a 50:50 beam splitter and detected by two avalanche photodiodes.
Both output signals of the photodiodes
are fed into a Time-Correlated Single
Photon Counting unit. The correlation function g(2)(τ) can then be extracted by measuring the histogram of the time difference τ between the
two signals. As a clear indicator for photon-antibunching, we expect a significant decrease of g(2)(0).