Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.51: Poster

Thursday, March 26, 2009, 15:00–17:30, P2

Optical Investigations of the Mode Spectra of InP–Quantum Dots Embedded in (Al_xGa_1−x)InP Micro Pillars. — •Moritz Bommer¹, Tim Thomay², Wolfgang–Michael Schulz¹, Martin Tomas², Robert Rossbach¹, Michael Jetter¹, Alfred Leitenstorfer², Rudolf Bratschitsch², and Peter Michler¹ — ¹Institut für Halbleiteroptik und Funktionelle Grenzflächen, Allmandring 3, D-70569 Stuttgart, Germany — ²1. Department of Physics and Center for Applied Photonics, University of Konstanz, D-78464 Konstanz, Germany

InP–quantum dots (QDs) are promising sources of single–photons and as active laser medium, emitting in the red part of the visible spectrum and thus in the range of the highest sensitivity of current silicon detectors.

The self assembled QDs were grown by metal organic vapor phase epitaxy and are embedded in between distributed Bragg reflectors (DBRs), afterwards the sample was processed by a Focused Ion Beam to fabricate micro–pillars. The DBRs and the high refractive index step between pillar and air results in a three dimensional mode confinement and highly directed emission and thus higher intensity.

We have investigated the mode spectra by micro–photo luminescence measurements for different pillar diameters and compared the spectra with a theoretical model showing up good consistency. Q–factors up to 3600 were achieved.