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Updated: May 6, 2026

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Published on: October 13, 2017

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

Yangzhi Tan^1,2, Yitong Huang¹, Dan Wu³

¹State 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.

Light, Science & Applications

|January 6, 2025

Summary

This summary is machine-generated.

We developed high-quality colloidal quantum dots (CQDs) and integrated them into circular Bragg resonators (CBRs) to create stable, low-threshold surface-emitting CQD lasers. This breakthrough enables high-density laser arrays for advanced applications.

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Area of Science:

Materials Science
Optoelectronics
Nanotechnology

Background:

Colloidal quantum dots (CQDs) offer tunable wavelengths and low optical gain thresholds, making them suitable for lasers.
Surface-emitting CQD lasers are promising for displays, sensing, and communication.
Challenges remain in achieving low thresholds, high stability, and integration density in CQD laser arrays.

Purpose of the Study:

To develop high-quality CQD materials and integrate them into advanced laser cavities.
To achieve low-threshold, stable, and highly integrated surface-emitting CQD laser arrays.
To demonstrate the potential of CQD lasers for practical applications.

Main Methods:

Developed core/interlayer/graded shell CQD structures for enhanced material quality.
Fabricated surface-emitting lasers using CQD-integrated circular Bragg resonators (CBRs).
Characterized laser performance, including threshold, stability, and integration density.

Main Results:

Achieved a low lasing threshold of 17 μJ/cm², a 70% reduction compared to CQD vertical-cavity surface-emitting lasers.
Demonstrated continuous stable operation for 1000 hours (3.63 × 10⁸ pulses) at room temperature.
Enabled high integration density exceeding 2100 pixels per inch due to the miniaturized mode volume of CBRs.

Conclusions:

The developed CQD material and CBR cavity combination significantly lowers lasing thresholds and enhances stability.
The high performance and integration density of CQD CBR lasers represent a significant advancement over existing nanocrystal-based lasers.
This work paves the way for practical applications of CQD lasers in displays, sensing, and communication.