SKM 2021 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 23: Focus Session: Highlights of Materials Science and Applied Physics III (joint session DS/HL)

HL 23.1: Vortrag

Freitag, 1. Oktober 2021, 11:15–11:30, H1

Free-Standing ZnSe-Based Microdisk Resonators - Influence of Edge Roughness on the Optical Quality and Degradation Reduction with Supported Geometry — •Wilken Seemann¹, Alexander Kothe¹, Christian Tessarek¹, Gesa Schmidt², Siqi Qiao², Nils von den Driesch², Jan Wiersig³, Alexander Pawlis², Gordon Callsen¹, and Jürgen Gutowski¹ — ¹Institute of Solid State Physics, University of Bremen, Germany — ²Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, Germany — ³Institut für Physik, Universität Magdeburg, Germany

Free-standing microdisks with ZnCdSe quantum wells in ZnMgSe barriers are analyzed using micro-photoluminescence (μPL). Stimulated emission into whispering gallery modes (WGMs) is demonstrated. Deformation functions of the resonators are determined via scanning electron microscopy (SEM). A correlation between edge roughness and optical quality is found. These results are confirmed by calculations based on the boundary element method using the measured deformation functions.

To reduce degradation in the ZnSe structures a fabrication technique new to this material system is introduced. It yields "supported" disks with no underetching which enhances the mechanical stability of the resonator and its thermal contact to the substrate. SEM measurements reveal an excellent structural quality of these resonators. The formation of WGMs in supported ZnSe:Cl resonators is demonstrated in μPL and confirmed by theoretical calculations.