Related Experiment Video
Updated: Oct 13, 2025
12:57
Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
9.3K
Bound State in the Continuum in Nanoantenna-Coupled Slab Waveguide Enables Low-Threshold Quantum-Dot Lasing.
Mengfei Wu1,2, Lu Ding1, Randy P Sabatini2
1Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore 138634, Singapore.
Nano Letters
|November 15, 2021
Summary
Colloidal quantum dots combined with nanoantennas achieve low-threshold lasing using bound states in the continuum (BICs). This breakthrough enables efficient, tunable lasers for various applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Colloidal quantum dots (CQDs) are key for solution-processed, tunable lasers.
- Potential applications include displays, communications, and biomedical devices.
Purpose of the Study:
- To achieve lasing in CQDs using bound states in the continuum (BICs).
- To engineer CQD films and nanoantennas for optimal BIC coupling and lasing performance.
Main Methods:
- Fabrication of a CQD film integrated with titanium dioxide nanoantenna arrays.
- Engineering CQD film thickness and nanoantenna dimensions for BIC mode optimization.
- Optical characterization of room-temperature lasing under pulsed excitation.
Main Results:
- Achieved room-temperature lasing with a low threshold of ~11 kW/cm2.
- Demonstrated BIC-based lasing through coupling of waveguide modes with nanoantennas.
- Engineered parameters for good spatial and spectral overlap between BICs and CQDs.
Conclusions:
- Bound states in the continuum (BICs) are effective for surface-emitting lasing in CQD systems.
- This approach offers a versatile platform for developing advanced, solution-processed lasers.
- Highlights BIC modes in distributed-feedback lasers for future optical device development.
