Low-threshold surface-emitting colloidal quantum-dot circular Bragg laser array

Yangzhi Tan; Yitong Huang; Dan Wu; Yunjun Wang; Xiao Wei Sun; Hoi Wai Choi; Kai Wang

doi:10.1038/s41377-024-01714-9

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Low-threshold surface-emitting colloidal quantum-dot circular Bragg laser array

Original Articles

- Low-threshold surface-emitting colloidal quantum-dot circular Bragg laser array
- Light: Science & Applications Vol. 14, Issue 1, Pages: 238-248(2025)
- Affiliations：
  
  1.State Key Laboratory of Optical Fiber and Cable Manufacture Technology, Institute of Nanoscience and Applications, Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen, China
  2.Department of Electrical and Electronic Engineering, The University of Hong Kong, Hong Kong, China
  3.College of New Materials and New Energies, Shenzhen Technology University, Shenzhen, China
  4.Suzhou Xingshuo Nanotech Co., Ltd. (Mesolight), Suzhou, China
- Author bio：
  
  Dan Wu (wudan@sztu.edu.cn)
  Xiao Wei Sun (sunxw@sustech.edu.cn)
  Hoi Wai Choi (hwchoi@hku.hk)
  Kai Wang (wangk@sustech.edu.cn)
- Funds：
- DOI：10.1038/s41377-024-01714-9
  CLC：
- Published：31 January 2025，
  
  Published Online：07 January 2025，
  
  Received：31 May 2024，
  
  Revised：30 November 2024，
  
  Accepted：2024-12-04
- Accepted：
Scan QR Code
Tan, Y. Z. et al. Low-threshold surface-emitting colloidal quantum-dot circular Bragg laser array. Light: Science & Applications, 14, 238-248 (2025).
DOI：

Tan, Y. Z. et al. Low-threshold surface-emitting colloidal quantum-dot circular Bragg laser array. Light: Science & Applications, 14, 238-248 (2025). DOI： 10.1038/s41377-024-01714-9.

摘要

Abstract

Colloidal quantum dots (CQDs) are attractive gain media due to their wavelength-tunability and low optical gain threshold. Consequently

CQD lasers

especially the surface-emitting ones

are promising candidates for display

sensing and communication. However

it remains challenging to achieve a low-threshold surface-emitting CQD laser array with high stability and integration density. For this purpose

it is necessary to combine the imp

rovement of CQD material and laser cavity. Here

we have developed high-quality CQD material with core/interlayer/graded shell structure to achieve a low gain threshold and high stability. Subsequently

surface-emitting lasers based on CQD-integrated circular Bragg resonator (CBR) have been achieved

wherein the near-unity mode confinement factor (Γ of 89%) and high Purcell factor of 22.7 attributed to the strong field confinement of CBR enable a low lasing threshold of 17 μJ cm

−2

which is 70% lower than that (56 μJ cm

−2

) of CQD vertical-cavity surface-emitting laser. Benefiting from the high quality of CQD material and laser cavity

the CQD CBR laser is capable of continuous stable operation for 1000 hours (corresponding to 3.63 × 10

pulses) at room temperature. This performance is the best among solution-processed lasers composed of nanocrystals. Moreover

the miniaturized mode volume in CBR allows the integration of CQD lasers with an unprecedentedly high density above 2100 pixels per inch. Overall

the proposed low-threshold

stable and compactly integrated CQD CBR laser array would advance the development of CQD laser for practical applications.

关键词

Keywords

references

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