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Two-Photon-Pumped Perovskite Semiconductor Nanocrystal Lasers.
Yanqing Xu1, Qi Chen1, Chunfeng Zhang1,2
1National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210093, China.
Journal of the American Chemical Society
|March 4, 2016
Summary
Perovskite nanocrystals enable efficient two-photon absorption and optical gain, overcoming limitations in frequency up-conversion lasers. This breakthrough facilitates stable, low-threshold two-photon-pumped lasing for practical applications.
Area of Science:
- Materials Science
- Optics and Photonics
- Nanotechnology
Background:
- Two-photon-pumped lasers offer frequency up-conversion but face material limitations.
- Conventional methods require phase matching, which is not always feasible.
- Lack of materials with efficient two-photon absorption and population inversion hinders practical use.
Purpose of the Study:
- To address the challenges in developing two-photon-pumped lasers.
- To explore perovskite nanocrystals as a potential solution for frequency up-conversion.
- To demonstrate efficient two-photon absorption and lasing using CsPbBr3 nanocrystals.
Main Methods:
- Utilizing colloidal CsPbBr3 nanocrystals in toluene solutions.
- Measuring two-photon absorption cross-section.
- Exciting optical gain in thin films.
- Coupling nanocrystals with microtubule resonators for lasing.
Main Results:
- Observed highly efficient two-photon absorption (2.7 × 10^6 GM) in CsPbBr3 nanocrystals.
- Achieved large optical gain (>500 cm^-1) in thin films.
- Demonstrated stable two-photon-pumped lasing with a low threshold.
Conclusions:
- Perovskite nanocrystals overcome material limitations for two-photon-pumped lasers.
- CsPbBr3 nanocrystals serve as excellent gain media for frequency up-conversion.
- This work paves the way for practical, high-performance up-conversion lasers.
