Emission Properties of GaN Planar Hexagonal Microcavities

Galia Pozina, Carl Hemmingsson, Alexei V. Belonovskii, Iaroslav V. Levitskii, Maxim I. Mitrofanov, Elizaveta I. Girshova, Konstantin A. Ivanov, Sergey N. Rodin, Konstantin M. Morozov, Vadim P. Evtikhiev, Mikhail A. Kaliteevski

Research output: Contribution to journalArticle

Abstract

Fabrication of microcavities based on III-nitrides is challenging due to difficulties with the coherent growth of heterostructures having a large number of periods, at the same time keeping a good precision in terms of thickness and composition of the alloy. A planar design for GaN microresonators supporting whispering gallery modes is suggested. GaN hexagonal microstructures are fabricated by selective-area metalorganic vapor phase epitaxy using focused ion beam for mask patterning. Low-temperature cathodoluminescence spectra measured with a high spatial resolution demonstrate two dominant emission lines in the near bandgap region. These lines merge at room temperature into a broad emission band peaking at ≈3.3 eV, which is shifted toward lower energies compared with the reference excitonic spectrum measured for the GaN layer. A numerical analysis of exciton–polariton modes shows that some strongly localized cavity modes can have high Purcell coefficients and can strongly interact with the GaN exciton.

Original languageEnglish
Article number1900894
JournalPhysica Status Solidi (A) Applications and Materials Science
DOIs
Publication statusAccepted/In press - Jan 1 2019

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Keywords

  • cavity modes
  • GaN hexagonal microstructures
  • planar microcavities
  • Purcell factor
  • selective area epitaxy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Pozina, G., Hemmingsson, C., Belonovskii, A. V., Levitskii, I. V., Mitrofanov, M. I., Girshova, E. I., Ivanov, K. A., Rodin, S. N., Morozov, K. M., Evtikhiev, V. P., & Kaliteevski, M. A. (Accepted/In press). Emission Properties of GaN Planar Hexagonal Microcavities. Physica Status Solidi (A) Applications and Materials Science, [1900894]. https://doi.org/10.1002/pssa.201900894