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HL: Fachverband Halbleiterphysik

HL 107: Microcavities, polaritons and condensates

HL 107.8: Vortrag

Freitag, 20. März 2015, 12:15–12:30, EW 015

Ultrafast all-optical switching of a single micropillar cavity — Henri Thyrrestrup¹, Emre Yüce¹, •Georgios Ctistis^1,2, Julien Claudon^3,4, Jean-Michel Gérard^3,4, and Willem L. Vos¹ — ¹Complex Photonic Systems (COPS), MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands — ²Nano-Bio Interfaces, Saxion University of Applied Sciences, Enschede, The Netherlands — ³CEA/INAC/SP2M, Nanophysics and Semiconductor Laboratory, Grenoble, France — ⁴University Grenoble Alpes, INAC-SP2M, Nanophysics and Semiconductors Lab, F-38000 Grenoble, France

Micropillar cavities are versatile nanophotonic structures for locally enhancing light-matter interaction due to their high quality factors, low mode volumes, and clean free-space optical interface. These qualities have facilitated the successful application of micropillars as efficient single photon sources, for cavity QED strong coupling, and diode lasers. We present here frequency- and time-resolved pump-probe experiments of a single GaAs/AlAs micropillar cavity with a diameter of 6 µm studying the dynamics of the cavity resonance. All-optical switching is achieved by excitation of free carriers. We observe a simultaneous shift of two different transverse modes in the micropillar. The high-resolution frequency time traces of the resonances show a strongly non-exponential relaxation dynamics [1]. We interpret this with a second-order mechanism including the radiative recombination of electron and holes and a slow free carrier trapping time.

[1] H. Thyrrestrup et al, Appl. Phys. Lett. 105, 111115 (2014)