Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 5: Semiconductor Lasers

HL 5.11: Talk

Monday, March 12, 2018, 12:15–12:30, EW 202

Fabrication of spectrally homogeneous microlaser arrays as a nanophotonic hardware for reservoir computing — •Tobias Heuser¹, Jan Grosse¹, Arsenty Kaganskiy¹, James Lott¹, Daniel Brunner², Ingo Fischer³, and Stephan Reitzenstein¹ — ¹Institut für Festkörperphysik, Technische Universiät Berlin, D-10623 Berlin, Germany — ²FEMTO-ST, 15B Avenue des Montboucons, 25030 Besançon, France — ³IFISC (UIB-CSIC), Campus Universitat de les Illes Balear, E-07122 Palma de Mallorca, Spain

Reservoir computing is a powerful machine learning concept for a new kind of data processing which is inspired by the neurons in the brain. In this concept an interacting network of nodes, called the reservoir, is evaluated by a trained readout for applications like fast pattern recognition. To further improve the performance of this concept, a photonic hardware implementation is of particular interest. Here, we report on developements of our fabrication process to realize large 2D arrays of microlasers, namely quantum dot micropillars and VCSELs, which will serve as a nonlinear network via diffractive optical coupling [1]. For this spectral alignment of the involved lasers is crucial. To achieve this with a spectral homogeneity better than 200µeV throughout the array of up to 900 lasers, shifts of the emission energy, which are related to the material growth, are compensated by electrical tuning or by precisely adjusting the radius of the fabricated micropillars [2].
References:

[1]D.Brunner, I.Fischer, Opt. Lett. 40, 3854-3857 (2015).

[2]S.Reitzenstein, A.Forchel, J.Phys.D.Appl.Phys. 43, 033001 (2010)