Optical shaping of the polarization anisotropy in a laterally coupled quantum dot dimer

Heedae Kim; Kwangseuk Kyhm; Robert A. Taylor; Jong Su Kim; Jin Dong Song; Sungkyun Park

doi:10.1038/s41377-020-0339-3

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Optical shaping of the polarization anisotropy in a laterally coupled quantum dot dimer

Original Articles

- Optical shaping of the polarization anisotropy in a laterally coupled quantum dot dimer
- Light: Science & Applications Vol. 9, Issue 4, Pages: 1040-1049(2020)
- Affiliations：
  
  1.School of Physics, Northeast Normal University, 130024 Changchun, China
  2.Clarendon Laboratory, Department of Physics, University of Oxford, Oxford OX1 3PU, UK
  3.Department of Opto-mechatronics, Pusan Nat'l University, Busan 609-735, Republic of Korea
  4.Department of Physics, Yeungnam University, Gyeongsan 712-749, Republic of Korea
  5.Nano-Photonics Research Center, KIST, Seoul 136-791, Republic of Korea
  6.Department of Physics, Pusan Nat'l University, Busan 609-735, Republic of Korea
- Author bio：
  
  Kwangseuk Kyhm (kskyhm@pusan.ac.kr)
  Robert A. Taylor (robert.taylor@physics.ox.ac.uk)
- Funds：
- DOI：10.1038/s41377-020-0339-3
  CLC：
- Published：2020，
  
  Published Online：11 June 2020，
  
  Received：17 August 2019，
  
  Revised：27 May 2020，
  
  Accepted：01 June 2020
- Accepted：
Scan QR Code
Kim, H. et al. Optical shaping of the polarization anisotropy in a laterally coupled quantum dot dimer. Light: Science & Applications, 9, 1040-1049 (2020).
DOI：

Kim, H. et al. Optical shaping of the polarization anisotropy in a laterally coupled quantum dot dimer. Light: Science & Applications, 9, 1040-1049 (2020). DOI： 10.1038/s41377-020-0339-3.

摘要

Abstract

We find that the emission from laterally coupled quantum dots is strongly polarized along the coupled direction [1

$$\bar 1$$

]

and its polarization anisotropy can be shaped by changing the orientation of the polarized excitation. When the nonresonant excitation is linearly polarized perpendicular to the coupled direction [110

]

excitons (X

and X

) and local

biexcitons (X

and X

) from the two separate quantum dots (QD

and QD

) show emission anisotropy with a small degree of polarization (10%). On the other hand

when the excitation polarization is parallel to the coupled direction [1

$$\bar 1$$

]

the polarization anisotropy of excitons

local biexcitons

and coupled biexcitons (X

) is enhanced with a degree of polarization of 74%. We also observed a consistent anisotropy in the time-resolved photoluminescence. The decay rate of the polarized photoluminescence intensity along the coupled direction is relatively high

but the anisotropic decay rate can be modified by changing the orientation of the polarized excitation. An energy difference is also observed between the polarized emission spectra parallel and perpendicular to the coupled direction

and it increases by up to three times by changing the excitation polarization orientation from [110

]

to [1

$$\bar 1$$

]

. These results suggest that the dipole–dipole interaction across the two separate quantum dots is mediated and that the anisotropic wavefunctions of the excitons and biexcitons are shaped by the excitation polarization.

关键词

Keywords

references

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