Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 33: Optical properties I

HL 33.1: Vortrag

Dienstag, 1. April 2014, 09:30–09:45, POT 006

Investigation of the Purcell effect in rolled-up active metamaterials by means of time-resolved photoluminescence measurements — •Hoan Vu1,3, Marvin Schulz1, Stephan Schwaiger1, Tobias Korn2, Christian Schüller2, David Sonnenberg1, Christian Heyn1, Tobias Kipp3, and Stefan Mendach11Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, D-20355 Hamburg, Germany — 2Institut für Experimentelle und Angewandte Physik, Universität Regensburg, D-93040 Regensburg, Germany — 3Institut für Physikalische Chemie, Universität Hamburg, Grindelallee 117, D-20146 Hamburg, Germany

In materials with hyperbolic light dispersion a broadband Purcell effect was predicted and recently experimentally investigated [1]. Here, we probe the Purcell effect of a GaAs quantum well embedded in rolled-up radial metamaterials, which we prepare exploiting the self-rolling mechanism of strained semiconductor layers [2]. We varied the thickness ratio η of rolled-up Ag/GaAs layer systems to tune the effective permittivity at the quantum well emission energy (1.63 eV) and thereby change the effective dispersions' iso-frequency surface from a closed ellipsoidal iso-frequency surface (η < 0.53) to an open hyperboloidal iso-frequency surface (η>0.53). We show by means of time-resolved photoluminescence measurements that the lifetime of GaAs quantum wells is enhanced by a factor of 2.5. We acknowledge financial support by the Deutsche Forschungsgemeinschaft (DFG) via ME 3600/1. [1] H. N. S. Krishnamoorthy et al., Science 336, 6078 (2012) [2] S. Schwaiger et al., Phys. Rev. B 84, 155325 (2011)

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