Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 20: Quantum Optics III

Q 20.2: Talk

Monday, March 5, 2018, 16:30–16:45, K 0.016

Emission properties and photon statistics of quantum-dot superluminescent diodes — •Franziska Friedrich and Reinhold Walser — Institut für Angewandte Physik, TU Darmstadt, Darmstadt, Germany

Broadband emitting quantum-dot superluminescent diodes (QD-SLDs) are indispensable semiconductor devices with many applications, e.g. in medical diagnostics (optical coherence tomography) or in fiber sensor technologies. Despite the widespread use, unusual behavior was observed regarding their photon statistics in a specific temperature regime [1]: the intensity correlation dropped down from 2 to 1.33 at T=190K, which is relevant from a fundamental point of view.

Here, we present a microscopic theory of the amplified spontaneous emission (ASE) of a broadband QD-SLD with tilted end facets. This multimode quantum theory yields rate equations for the optical power densities, the level occupation of an inhomogeneous ensemble of quantum dots within the diode, as well as the emitted optical spectra. As a main result, we find the external power spectrum as a convolution of the intra-diode photon spectrum with a Lorentzian response, which agrees quantitatively with available experimental data [2]. In addition, we discuss photon statistics of QD-SLDs as a function of temperature.

M. Blazek, W. Elsäßer, Phys. Rev. A 84, 063840 (2011)
[2] F. Friedrich, R. Walser, to be published