Abstract
This study is devoted to the luminescence and stimulated emission properties of the ZnO hybrid structure, which is vertically aligned microcrystals with the [0001] crystallographic orientation and a pronounced hexagonal shape formed on a continuous layer of micron thickness. These microcrystals are up to 10 µm high and up to 8 µm in diameter and form the main part of the structure’s thickness. The structure was synthesized on the M(101¯0) plane of sapphire using the magnetron sputtering method. Luminescence of the structure, represented only by conventional near-UV and green components under low-intensity continuous photoexcitation, confirms its high structural and optical quality. Under pulsed photoexcitation with relatively high intensity, stimulated emission (SE) was observed from the structure in the near-UV region at room temperature. The threshold power density for SE was 0.1–0.2 MW/cm2. Exceeding the threshold leads to a significant increase in the emission intensity compared to the control film without [0001] microcrystals, also grown on M(101¯0) sapphire. It was assumed that the optical gain is provided by the whispering gallery modes of individual [0001] microcrystals as a result of inelastic exciton–electron scattering, at least at near-threshold excitation intensities.
Funder
the Council of the President of the Russian Federation for State Support of Young Scientists and Leading Scientific Schools
Subject
Radiology, Nuclear Medicine and imaging,Instrumentation,Atomic and Molecular Physics, and Optics
Reference47 articles.
1. Klingshirn, C.F., Meyer, B.K., Waag, A., Hoffmann, A., and Geurts, J. (2010). Zinc Oxide: From Fundamental Properties towards Novel Applications, Springer.
2. Whispering-gallery mode lasing in ZnO microcavities;Laser Photon Rev.,2014
3. Ultraviolet lasing behavior in ZnO optical microcavities;J. Mater.,2017
4. Photoluminescence and ultraviolet lasing of polycrystalline ZnO thin films prepared by the oxidation of the metallic Zn;Appl. Phys. Lett.,1999
5. Biexciton luminescence in high-quality ZnO epitaxial thin films;J. Appl. Phys.,2001
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