Self-diffraction of ultrashort laser pulses under resonant excitation of excitons in a colloidal solution of CdSe/ZnS quantum dots

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

doi:10.1070/qe2013v043n10abeh015257

Cited by 17 publications

(2 citation statements)

References 9 publications

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“…And in this case we can say about dynamic photonic crystal formation. Also diffraction rings typical for Fresnel diffraction arise for the beams penetrated through the sample holding input beams directions and even for the first order self-diffraction beams 6 . The intensity of I ±1 beams is sufficient to create in their turn transparency channels and to be diffracted at rigid circular aperture.…”

Section: Qd2mentioning

confidence: 99%

Degenerate four-wave mixing and two-photon induced gratings in colloidal quantum dots CdSe/ZnS

2015

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The features of nonlinear and electro-optical processes has been discovered in the case of two-photon resonant excitation of the excitons in colloidal CdSe/ZnS quantum dots. Self-diffraction arises for two laser beams intersecting in the cell with colloidal CdSe/ZnS quantum dots (QDs) due to the dynamic phase grating formatting. The calculated induced change in the refractive is sufficient to form a phase diffraction grating. Such a large value of χ (3) as compared to the third-order nonlinear susceptibility for the solvent (hexane) is due to the increase in χ (3) occurring when the intermediate resonance is attained in a medium transparent for laser radiation. In order to identify physical processes responsible for the induced grating formation and the diffraction efficiency self-diffracted pulse intensity dependences on the incident pulse intensity were measured for two samples of colloidal QD CdSe/ZnS, which frequency of the fundamental exciton transition is tuned to the high-frequency and low-frequency region from the double laser frequency. The discovered cubic dependence of the self-diffracted pulse intensity on the incident pulse intensity was explained by four-wave mixing process. Discovered above 5-th index of power dependence of the self-diffracted pulse intensity on the excitation pulses intensity we explained by the increasing magnitude of two-photon absorption (due to shifting of two photons energy of laser radiation to the exact exciton absorption resonance by red Stark shift of the exciton absorption), accompanied by the growth absorption by two-photon excited carriers that leads to the induced amplitude grating formation in addition to the phase grating.

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Section: Qd2mentioning

confidence: 99%

Degenerate four-wave mixing and two-photon induced gratings in colloidal quantum dots CdSe/ZnS

2015

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“…The nonlinearity leads to many nonlinear optical (NLO) phenomena, such as frequency‐mixing processes, Kerr effects, multi‐photon absorption, and saturable absorption, opening doors for advanced photonic devices . Therefore, it is fascinating to discover promising NLO materials for future photonics, and various novel NLO materials have been studied, including organic materials, carbon nanomaterials, metal nanoparticles, semiconductor quantum dots, etc.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Optical Properties of Few‐Layer Rhenium Disulfide Nanosheets and Their Passively Q‐switched Laser Application

Liu

Wang

Yin

et al. 2019

Physica Status Solidi (a)

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Rhenium disulfide nanosheets (ReS 2 NSs) are attracting increasing attention because of their unique layer-independent physicochemical properties, however, their nonlinear optical (NLO) properties are less investigated. Herein, ReS 2 NSs are successfully exfoliated by the sonication assisted liquid phase exfoliation method. Their broadband NLO responses are studied by open aperture and closed-aperture Z-scan technique at 532-1342 nm. The ReS 2 NSs dispersion exhibits saturable absorption, nonlinear scattering, and refraction responses. Broadband saturable absorption responses are also observed for the ReS 2 NSs film on the glass substrate. Additionally, twophoton absorption response is shown at 1342 nm at larger excitation energy. The saturable absorption of ReS 2 NSs makes it possible to fabricate the saturable absorber with the as-prepared nanosheets. Passively Q-switched laser operations are realized at 1.06 and 1.3 mm. These results have revealed the potential of ReS 2 NSs in versatile NLO applications.

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Enhanced nonlinear optical properties of ZnS nanoparticles in 1D polymer photonic crystal cavity

Vasudevan

Divyasree

Chandrasekharan

2019

Optics & Laser Technology

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Self-diffraction of ultrashort laser pulses under resonant excitation of excitons in a colloidal solution of CdSe/ZnS quantum dots

Cited by 17 publications

References 9 publications

Degenerate four-wave mixing and two-photon induced gratings in colloidal quantum dots CdSe/ZnS

Degenerate four-wave mixing and two-photon induced gratings in colloidal quantum dots CdSe/ZnS

Nonlinear Optical Properties of Few‐Layer Rhenium Disulfide Nanosheets and Their Passively Q‐switched Laser Application

Enhanced nonlinear optical properties of ZnS nanoparticles in 1D polymer photonic crystal cavity

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