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Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 36: II-VI- and III-V-semiconductors

HL 36.1: Vortrag

Donnerstag, 4. April 2019, 09:30–09:45, H31

Optical properties of ZnSe-based microcavities — •Wilken Seemann1, Alexander Kothe1, Gesa Schmidt2, Alexander Pawlis2, and Jürgen Gutowski11Institute of Solid State Physics, Semiconductor Optics, University of Bremen, 28359 Bremen, Germany — 2Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany

In the past years microcavities and microdisks have been shown to be a well-suited platform for the realization of low-threshold and thresholdless lasers since a small volume of the gain medium and strong containment of light can be achieved [1]. Particular interest has been directed towards whispering gallery modes (WGM) in microdisks which propagate along the border of the disk by total reflection and are therefore strongly contained. Such lasing modes were also realized in VCSEL-micropillar structures with quantum dots as gain medium [2].

Here, we analyse II-VI micropillar-microcavities and microdisks by means of micro-photoluminescence (μPL) and time-resolved μPL studies. The micropillar-microcavities were manufactured by cutting vertical 1λ-cavities with three quantum wells situated between distributed Bragg reflectors (DBRs) through focused ion beam (FIB) etching. Both the micropillar-microcavities and the microdisks exhibit diameters of a few micrometers. The results obtained from microdisk and micropillar structures are compared and their influence on the containment and the modes is discussed.

[1] L. He et al.: Laser & Photonics reviews 7(1), 2013, 60.

[2] V. N. Astratov et al.: Applied Physics Letters 91(7), 2007, 071115.

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