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 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.

Active photonic devices based on colloidal semiconductor nanocrystals and organometallic halide perovskites

“…Lasing from the colloidal solution of CdSe/CdS NPs was also obtained by using the end faces of a cuvette as mirrors (see Fig. 11e) [73]. Moreover, the high absorption cross section of the NPs developed an efficiency excitation under TPA (excitation wavelength at 800 nm) or even under three photon excitation (excitation wavelength at 1300 nm).…”

“…(e) Sides of a cuvette acting as mirrors. Published with permission of Nature publishing group [73].…”

A comparative study demonstrates strong size tunability of carrier–phonon coupling in CdSe-based 2D and 0D nanocrystals

“…Particularly 2D semiconductors in the form of nanoplatelets and sheets [1][2][3][4][5][6] receive growing attention due to fast radiative lifetimes 7,8 related to strong exciton correlation and the giant oscillator strength effect 4,9,10 allowing high quantum yields, 11,12 promising lasing properties [13][14][15] and high two-photon absorption. [15][16][17] Furthermore, their directed emission 18 and polarization 19 and well-width dependent high dark-bright splitting 20,21 of 3-6 meV are of direct interest. High exciton binding energies (of >100 meV) have been predicted and measured, 4,14,22,23 confirming the presence of robust excitons even at room temperature.…”

Up-Conversion Perovskite Nanolaser with Single Mode and Low Threshold

“…11,12,17 Thus, it is highly desired to find a new type of semiconductor materials to overcome above problems.…”