Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 15: Devices

HL 15.5: Vortrag

Montag, 25. Februar 2008, 12:15–12:30, ER 164

Towards an electrically driven single photon source — •Christian Jendrysik, Roland Enzmann, Daniela Baierl, Christian Seidel, Andreas Heindl, Silvan Türkcan, Gerhard Böhm, Ralf Meyer, Jonathan Finley, and Markus-Christian Amann — Walter Schottky Institute, Am Coulombwall 3, D-85748 Garching, Germany

To realize applications like quantum cryptography electrically driven, efficient single photon sources are necessary. We present a concept of an electrically driven, quantum dots based single photon device, which is furthermore compatible with a high quality resonator like a photonic crystal and should therefore allow high extraction efficiencies.

The quantum dots are pumped optically via a light emitting diode (LED) which is monolithically integrated underneath the quantum dot layer. The wavelength of the photons emitted by the LED can be adjusted to resonant or non-resonant excitation of the quantum dots. For high efficiency it is necessary to shift the emission of the quantum dots into the mode of the photonic crystal. This can be done by a Schottky contact in reverse bias. Thus an electrical field at the location of the quantum dots can be generated which leads to a red shift of the emission because of the quantum confined stark effect. Hence the wavelength of the quantum dots can be modified independently of the pumping process. First measurements show the feasibility of our concept to realize a single photon device.