Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 28: Poster Session: Graphen; Transport properties; Transport in high magnetic fields / Quantum Hall effect; Metal-semiconductor hybrid systems

HL 28.27: Poster

Montag, 11. März 2013, 16:00–20:00, Poster A

Purcell effect in rolled-up active hyperbolic metamaterials — •Marvin Schulz, Hoan Vu, Stephan Schwaiger, David Sonnenberg, Christian Heyn, and Stefan Mendach — Institute of Applied Physics, University of Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany

Using the relaxation process of strained semiconductor layers [1] we fabricate microtubes whose walls represent three-dimensional hyperbolic metamaterials consisting of alternating semiconductor ((Al)(In)GaAs) and metal (Ag) layers [2]. Here, we investigate the Purcell effect for a GaAs quantum well embedded in the semiconductor compound of the metamaterials [3]. We varied the Ag/GaAs thickness ratio η = d_(Ag)/d_(GaAs) to tune the anisotropic effective permittivity tensor of the metamaterial at the quantum well emission energy (1.63 eV). Time-resolved photoluminescence measurements reveal a sharp decrease of the embedded quantum well's lifetime τ from τ = 430 ps for metamaterials with η < 0.53 to τ = 250 ps for metamaterials with η > 0.53. This well corresponds to an increase of the photon density of states as expected at the transition to the hyperbolic dispersion regime [4, 5]. The authors acknowledge financial support by the Deutsche Forschungsgemeinschaft via Graduiertenkolleg 1286.

[1] V. Ya. Prinz et al., Physica E 6, 828 (2000).

[2] S. Schwaiger et al., Phys. Rev. Lett. 102, 163903(2009).

[3] S. Schwaiger et al., Phys. Rev. B 84, 155325 (2011).

[4] M. A. Noginov et al., Opt. Lett. 35, 1863 (2010).

[5] T. Tumkur et al., Appl. Phys. Lett. 99, 151115 (2011).