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Efficient Upconverted Exciton-Polariton Lasing via Three-Photon Absorption in Colloidal Quantum Wells
Haixiao Zhao1, Junhong Yu2, Chenlin Wang1
1School of Information Science and Engineering, Key Laboratory of Laser & Infrared System (Shandong University), Ministry of Education, Shandong University, Qingdao 266237, China.
Colloidal quantum wells achieve low-threshold upconverted lasing through three-photon absorption and exciton-polariton strong coupling. This breakthrough enables efficient nonlinear polaritonic devices and advanced laser applications.
Area of Science:
- Materials Science
- Quantum Optics
- Nanotechnology
Background:
- Achieving low-threshold lasing under multiphoton excitation is difficult due to weak nonlinear absorption and population inversion requirements.
- Colloidal quantum wells (CQWs) offer potential solutions with their unique optical properties.
Purpose of the Study:
- To demonstrate low-threshold, upconverted exciton-polariton lasing in colloidal semiconductors using CQWs.
- To investigate the potential of CQWs for nonlinear polaritonic devices.
Main Methods:
- Utilizing colloidal quantum wells (CQWs) with large three-photon absorption (3PA) cross sections.
- Employing femtosecond laser excitation at 1030 nm.
- Embedding CQWs in Fabry-Pérot cavities to achieve exciton-photon strong coupling.
Main Results:
- Observed photoluminescence and amplified spontaneous emission via 3PA in CdSe and CdSe/CdS CQWs.
- Demonstrated pronounced polariton dispersions with a Rabi splitting of ~202 meV.
- Achieved inversion-free exciton-polariton lasing with a reduced threshold via bosonic final-state stimulation.
Conclusions:
- CQWs enable the first upconverted exciton-polariton lasing in colloidal semiconductors.
- CQWs provide a powerful platform for developing low-threshold, upconverted lasers.
- This research paves the way for novel nonlinear polaritonic devices.
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