Current Optics and Photonics

Optical Society of Korea (한국광학회)
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Polarization Ellipticity of Micro-photoluminescence in a Single GaAs/AlGaAs Quantum Ring

  • Kim, Minju (Department of Opto-mechatronics and Cogno-mechatronics Engineering, Pusan National University) ;
  • Jang, Juyeong (Department of Opto-mechatronics and Cogno-mechatronics Engineering, Pusan National University) ;
  • Lee, Seunghwan (Department of Opto-mechatronics and Cogno-mechatronics Engineering, Pusan National University) ;
  • Song, Jindong (Nano-Photonics Research Center, KIST) ;
  • Kyhm, Kwangseuk (Department of Opto-mechatronics and Cogno-mechatronics Engineering, Pusan National University)
  • Received : 2020.11.05
  • Accepted : 2020.12.24
  • Published : 2021.02.25
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Abstract

The polarized micro-photoluminescence spectrum was analyzed to investigate the anisotropic localized states in a single GaAs quantum ring. An energy difference of ~0.1 meV was observed from the perpendicularly polarized spectrum measured by a pair of linear analyzers. Spectral dependence of the polarized emission was also characterized in terms of rotation and ellipticity angles using four Stokes parameters. While the rotation angle indicates the symmetric axis of an anisotropic quantum ring with a small variation (± 2°), the ellipticity angle varies from 7.4° down to -2.5°. We conclude that optical anisotropy and birefringence are induced by the crescent-like lateral shape of localized states.

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References

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