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The Cavity-Effect in Site-Controlled GaN Nanocolumns with InGaN Insertions

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Abstract

We have studied optical properties of site-controlled GaN nanocolumns (NCs) with an insertion of InGaN QW grown on the micro-cone patterned substrate. Time-resolved photoluminescence spectroscopy reveals two bands emission. Comparison of these spectra with the emission of a separate nanocolumn, recorded by μ-CL with high spatial resolution, allows us to ascribe the higher energy band to emission from the InGaN QW situated on the top of NCs, while the lower-energy band originates from the QW in the rest area. By the modeling of the decay times and amplitudes of PL decay curves, we have exhibited a significant enhancement of signal from the QW inside the NCs. Investigation of the NCs as a Fabry-Perót cavity at eigenfrequencies around the optical transitions has revealed that the cavity modes can provide significant enhancement of the emission from the inserted QW owing to the Purcell factor.

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ACKNOWLEDGMENTS

The authors thank V.N. Jmerik for providing samples and G. Pozina for the help in structural and optical characterization.

Funding

The study was carried out with the financial support of RFBR grant no. 19-02-00185. E.A.E. appreciates the partial support from the Russian Science Foundation (project no. 19-72-30040).

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Authors and Affiliations

  1. Ioffe Institute, 194021, St Petersburg, Russia

    D. R. Kazanov, E. A. Evropeytsev & T. V. Shubina

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  1. D. R. Kazanov
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  2. E. A. Evropeytsev
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  3. T. V. Shubina
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Correspondence to D. R. Kazanov, E. A. Evropeytsev or T. V. Shubina.

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Kazanov, D.R., Evropeytsev, E.A. & Shubina, T.V. The Cavity-Effect in Site-Controlled GaN Nanocolumns with InGaN Insertions. Semiconductors 53, 2085–2089 (2019). https://doi.org/10.1134/S1063782619120121

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  • DOI: https://doi.org/10.1134/S1063782619120121

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