Ultralow-threshold multiphoton-pumped lasing from colloidal nanoplatelets in solution

Mingjie Li, Min Zhi, Hai Zhu, Wen-Ya Wu, Qing-Hua Xu, Mark Hyunpong Jhon and Yinthai Chan ()
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Mingjie Li: National University of Singapore
Min Zhi: National University of Singapore
Hai Zhu: National University of Singapore
Wen-Ya Wu: National University of Singapore
Qing-Hua Xu: National University of Singapore
Mark Hyunpong Jhon: Institute of High Performance Computing A*STAR
Yinthai Chan: National University of Singapore

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: Abstract Although multiphoton-pumped lasing from a solution of chromophores is important in the emerging fields of nonlinear optofluidics and bio-photonics, conventionally used organic dyes are often rendered unsuitable because of relatively small multiphoton absorption cross-sections and low photostability. Here, we demonstrate highly photostable, ultralow-threshold multiphoton-pumped biexcitonic lasing from a solution of colloidal CdSe/CdS nanoplatelets within a cuvette-based Fabry–Pérot optical resonator. We find that colloidal nanoplatelets surprisingly exhibit an optimal lateral size that minimizes lasing threshold. These nanoplatelets possess very large gain cross-sections of 7.3 × 10−14 cm2 and ultralow lasing thresholds of 1.2 and 4.3 mJ cm−2 under two-photon (λexc=800 nm) and three-photon (λexc=1.3 μm) excitation, respectively. The highly polarized emission from the nanoplatelet laser shows no significant photodegradation over 107 laser shots. These findings constitute a more comprehensive understanding of the utility of colloidal semiconductor nanoparticles as the gain medium in high-performance frequency-upconversion liquid lasers.

Date: 2015
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DOI: 10.1038/ncomms9513

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