The features of nonlinear absorption of two-photon excited excitons in CdSe/ZnS quantum dots

Днепровский, В. С.; Kozlova, M. V.; Smirnov, A. M.; Wumaier, Tuerdi

doi:10.1016/j.physe.2012.05.028

Cited by 23 publications

(21 citation statements)

References 13 publications

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“…where σ (2) is the TPACS, N is the number of QDs in the excited volume, Φ is the PL QY, and g is the factor of PL collection efficiency. However, when we placed the QD near the PNP, the excitons interacted not only with external far-field E 0 , but also with the plasmon-induced near-field.…”

Section: Resultsmentioning

confidence: 99%

“…However, when we placed the QD near the PNP, the excitons interacted not only with external far-field E 0 , but also with the plasmon-induced near-field. Thus, if we still use the easily measurable far-field intensity I 0 (eqn (1)) we should use the effective TPACS (σ eff (2) ) instead of σ (2) to account for the effect of plasmons on the TPA of excitons in QDs:…”

Section: Resultsmentioning

confidence: 99%

“…Semiconductor quantum dots (QDs) are known for their highly efficient two-photon absorption (TPA) compared to the conventional organic fluorophores. 1,2 Due to the very high values of two-photon absorption cross-sections (TPACSs), 3,4 QDs are widely used for two-photon fluorescent bioimaging, [5][6][7] where they ensure a uniquely high contrast, as well as for fabrication of nonlinear optoelectronic devices operating in the up-conversion mode. 8,9 However, due to the nonlinear nature of the TPA process, efficient two-photon excitation (TPE) of QD photoluminescence (PL) requires very high laser intensities, 2 which limits their applications.…”

Section: Introductionmentioning

confidence: 99%

“…1,2 Due to the very high values of two-photon absorption cross-sections (TPACSs), 3,4 QDs are widely used for two-photon fluorescent bioimaging, [5][6][7] where they ensure a uniquely high contrast, as well as for fabrication of nonlinear optoelectronic devices operating in the up-conversion mode. 8,9 However, due to the nonlinear nature of the TPA process, efficient two-photon excitation (TPE) of QD photoluminescence (PL) requires very high laser intensities, 2 which limits their applications. It is well known that the efficiency of the exciton PL in QD can be enhanced by coupling with plasmons in metal nanoparticles under single-photon excitation, which allows the use of lower radiation intensities for the excitation of PL.…”

Section: Introductionmentioning

confidence: 99%

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Strong increase in the effective two-photon absorption cross-section of excitons in quantum dots due to the nonlinear interaction with localized plasmons in gold nanorods

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strong increase in the effective two-photon absorption cross-section of excitons in quantum dots due to the nonlinear interaction with localized plasmons in gold nanorods

et al. 2021

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“…The observed output cross section intensity distribution of the beams was attributed to Fresnel self-diffraction at rigid circular aperture that arise due to the creation of transparency channel as a result of the bleaching (decreasing of exciton absorption, dominating state-filling effect [7][8][9][10][11] in CdSe/ZnS QDs at resonant excitation by powerful picosecond pulses of Nd:YAG-laser's second harmonic.…”

Section: Introductionmentioning

confidence: 99%

Modeling of self-diffraction from the induced aperture in colloidal quantum dots

Ezhova

Smirnov

2015

SPIE Proceedings

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Modeling of self-diffraction pattern formation from the induced diaphragm, arising in the case of the transparency channel saturation by one-photon resonant non-stationary excitation of the basic exciton transition in colloidal quantum dots (QDs) is realized. The simulation results allow us to obtain the reference image of self-diffraction pattern and dependence of the intensity transverse distribution of the output beam from the intensity of the excitation beam, forming a transparency channel. A powerful laser pulse creates a transparency channel, so that it self-diffracts on the induced diaphragm. The possibility to apply the obtained simulation results for intensity estimation of the laser radiation and for the possible application in the technique (nonlinear-optical limiters of intense laser radiation in the visible and nearinfrared region, optical switches) are discussed.

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A New Generation of Liquid Lasers from Engineered Semiconductor Nanocrystals with Giant Optical Gain

Huang

Sun

et al. 2023

Laser & Photonics Reviews

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With the development of optofluidic technology, liquid lasers have attracted intense interest but still face a formidable challenge due to the lack of qualified gain media and creative device design. Compared to the organic fluorescent dyes and traditional CdSe‐based nanocrystals (NCs), the lead‐halide perovskite (LHP) NCs feature larger gain coefficient and higher robustness, which renders LHP NCs a promising unexploited liquid gain medium. Herein, for the first time, the hidden principle governing the solution‐based light amplification in LHP semiconductor NCs is demystified and it is demonstrated that the LHP NCs are superior solution‐phase gain media showing a giant (≈2600 cm−1) optical gain. On this basis, a novel microfluidic laser device is designed and realized that exhibits a record‐low pump threshold (≈22.7 µJ cm−2), high Q‐factor (≈7480), large output polarization (≈0.91), and long‐time robustness over high‐intensity operation, which is readily applicable to practical applications. The findings represent a significant step toward the technologically important liquid lasers of the new generation and can advance optofluidic applications.

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The features of nonlinear absorption of two-photon excited excitons in CdSe/ZnS quantum dots

Cited by 23 publications

References 13 publications

Strong increase in the effective two-photon absorption cross-section of excitons in quantum dots due to the nonlinear interaction with localized plasmons in gold nanorods

Strong increase in the effective two-photon absorption cross-section of excitons in quantum dots due to the nonlinear interaction with localized plasmons in gold nanorods

Modeling of self-diffraction from the induced aperture in colloidal quantum dots

A New Generation of Liquid Lasers from Engineered Semiconductor Nanocrystals with Giant Optical Gain

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