Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Plasmonics and Nanooptics

O 59.30: Poster

Dienstag, 21. März 2017, 18:30–20:30, P2-OG1

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 colloidal semiconductor QDs on freely definable sites on the substrate. So far, we have used this method for the precise placement of small patches of QDs containing several emitters. The aim of this work is its improvement to reliable single QD placement. In order to show photon-antibunching of the fluorescence of a single QD we are performing a Hanbury-Brown-Twiss experiment (HBT). In the HBT the fluorescence is divided by a 50:50 beam splitter and detected by two avalanche photodiodes. By connecting the output signals of the photodiodes to a Time-Correlated Single Photon Counting unit, one signal serves as start and the other as stop signal. By measuring the histogram of the time difference between the two signals, we obtain the second-order correlation function g(2)(τ). Since the excitation is done by a pulsed laser, we expect g(2)(τ) to be periodic. To show photon-antibunching, we want to measure a significant decrease at g(2)(0).

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