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

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) cm(2) 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 10(7) 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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Li M,Zhi M,Zhu H,Wu WY,Xu QH,Jhon MH,Chan Y

doi

10.1038/ncomms9513

subject

Has Abstract

pub_date

2015-09-30 00:00:00

pages

8513

issn

2041-1723

pii

ncomms9513

journal_volume

6

pub_type

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