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HL: Fachverband Halbleiterphysik
HL 33: Optical properties
HL 33.1: Vortrag
Dienstag, 17. März 2020, 14:00–14:15, POT 112
Influence of edge roughness on the optical properties of ZnSe-based microdisks — •Wilken Seemann1, Alexander Kothe1, Gesa Schmidt2, Alexander Pawlis2, and Jürgen Gutowski1 — 1Institute of Solid State Physics, Semiconductor Optics, University of Bremen, 28359 Bremen, Germany — 2Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany
The considerable storage of light in whispering gallery modes (WGM) being favored in microdisk resonators is necessary to achieve low-threshold lasing [1]. It is furthermore an interesting aspect for the use of these resonators in several quantum optical applications where emission centers inside the disk act as single-photon sources or spin-qubits, like quantum memories [2].
We will show micro-photoluminescence (µPL) spectra of WGMs from ZnSe-based quantum well microdisks with diameters in the range of 2.5 to 4 µm and relate their optical properties to structural properties obtained from the analysis of scanning electron microscopy (SEM) images of the disks. We discuss that recutting the disks with a focused ion beam (FIB) can reduce the roughness of their edges and thus lead to better optical quality, i.e. increased light containment.
[1] L. He et al.: Laser & Photonics Reviews 7(1), 2013, 60.
[2] J.I. Cirac et al.: Physical Review Letters 78(16), 1997, 3221.