Nonlinear optical response of planar and spherical CdSe nanocrystals

Selyukov, A. S.; Исаев, А. А.; Vitukhnovsky, A. G.; Litvak, V. L.; Katsaba, A. V.; Korshunov, Vladislav M.; Vasiliev, R. B.

doi:10.1134/s1063782616070228

Cited by 14 publications

(6 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7. In our experiment we did not observe any traces of trapping of charges at defect sites [21,27], so we do not take this effect into account in this model.…”

Section: Theory and Discussionmentioning

confidence: 73%

“…Despite a set of potential applications of colloidal NPLs, experimental investigation of their fundamental properties was mainly focused on the time ranges of the excited states dynamics, such as decay pathways of the single-exciton state [12,21], recombination dynamics of band edge excitons [16], non-radiative Auger recombination [11,23] or photoluminescence decay dynamics [24,25]. In the same time various possible applications of NPLs in optical devices calls for detailed investigation of their nonlinear optical properties at high (room) temperature [26][27][28]. This however have hardly been done up to date.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear light absorption in colloidal CdSe/CdS nanoplatelets

Mantsevich,

Smirnov,

Smirnov

et al. 2018

Preprint

Self Cite

View full text Add to dashboard Cite

We investigated the nonlinear optical properties of CdSe/CdS nanoplatelets in the vicinity of heavy hole and light hole exciton resonances. The two color pump-probe technique was applied. The first intense pulse created non-equilibrium exciton population, which was detected as a decrease of probe light absorption. We observed intense scattering of excitons between heavy-and lighthole excitonic states. We also studied experimentally saturation of absorption in nanoplatelets. Theoretical description of these phenomena allowed us to determine parameters of exciton dynamics in nanoplatelets.

show abstract

“…7. In our experiment we did not observe any traces of trapping of charges at defect sites [21,27], so we do not take this effect into account in this model.…”

Section: Theory and Discussionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Nonlinear light absorption in colloidal CdSe/CdS nanoplatelets

Mantsevich,

Smirnov,

Smirnov

et al. 2018

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…In another recent report, 26 Smirnov's group studied the nonlinear change in transmission and photoluminescence of the colloidal CdSe NPLs exciting at 360 nm and probing around 420−500 nm with pulses of 9 ns duration. Seliukov and coauthors 27 studied the NLO of a colloidal solution of CdSe semiconductor NPLs and compared it to CdSe quantum dots. In their work, the excitation source was from a continuous-wave (CW) laser with a wavelength of 473 nm, and they employed the spatial selfphase modulation technique, generating rings to infer the NLO response.…”

Section: T X Xmentioning

confidence: 99%

Nonlinear Optical Properties of 2D CdSe Nanoplatelets in a Nonresonant Regime

et al. 2023

View full text Add to dashboard Cite

The nonlinear optical response of CdSe and CdSe/CdS core/shell nanoplatelets (NPLs) in toluene suspension was determined by using Z-scan and optical Kerr gate (OKG) techniques at 800 nm in the femtosecond regime. First, an analysis of the nonlinearities based on the Z-scan resulted in n 2 = 1.4 × 10 −16 cm 2 /W and n 2 = 1.3 × 10 −16 cm 2 /W for CdSe and CdSe/CdS core/shell NPLs, respectively. Fifth-order nonlinear absorption behavior was predominant, resulting in α 4 = 4.0 × 10 −2 cm/GW for CdSe NPLs and α 4 = 9.0 × 10 −3 cm/GW for CdSe/CdS core/shell NPLs for an optical intensity of 60.97 and 122 GW/cm 2 , respectively. The nonlinear refractive index obtained from Z-scan is in good agreement with those obtained from the OKG, and the response time obtained from OKG showed a decay of less than 1 ps for all studied materials, about 5 times slower than the pulse duration. For optical intensities in the range between 30.45 and 182.8 GW/cm 2 , NLA was not observed for toluene but was observed for CdSe and CdSe/CdS core/shell NPLs, revealing that the presence of the NPLs decreases the threshold of the absorptive nonlinearity. The results are discussed and explained based on the well-known materials' electronic structure.Article pubs.acs.org/JPCC

show abstract

“…The effective separation of this quantum state from all other excited quantum states of QDs was realized on the basis of a significant difference in the relaxation time of this quantum state compared to other quantum states. The characteristic relaxation time of such a quantum state lies in the millisecond range [10][11][12][13]. This time exceeds the characteristic time of exciton luminescence, which is the main channel of relaxation of separated charge carriers, by 6 orders of magnitude, which allows us to consider this quantum state of QDs as the second stable quantum state of q-bits.…”

Section: Quantum Superposition As a Quantum Spacementioning

confidence: 99%

Two Signs of Superfluid Liquid in a Suspension of CdSe/ZnS Quantum Dots at Room Temperature

Исаев

2019

International Journal of Optics

Self Cite

View full text Add to dashboard Cite

The paper presents experimental results of the interaction of a focused optical beam with a suspension of CdSe/ZnS quantum dots in toluene. Two autographs characteristic only of the behavior of a superfluid quantum liquid were experimentally observed. The first was the fountain effect from the region of local heating of the suspension with an optical beam; the second was the complete “creeping out” of the QDs suspension in the form of a thin film along the walls of the cuvette in which the suspension was located. The results of the work suggest that superfluid quantum liquid may arise at room temperature as a result of the functioning of many-particle quantum superposition. Bose-Einstein condensation of entangled quantum states is proposed as a physical mechanism for producing a superfluid liquid, regardless of temperature.

show abstract

Nonlinear optical response of planar and spherical CdSe nanocrystals

Cited by 14 publications

References 13 publications

Nonlinear light absorption in colloidal CdSe/CdS nanoplatelets

Nonlinear light absorption in colloidal CdSe/CdS nanoplatelets

Nonlinear Optical Properties of 2D CdSe Nanoplatelets in a Nonresonant Regime

Two Signs of Superfluid Liquid in a Suspension of CdSe/ZnS Quantum Dots at Room Temperature

Contact Info

Product

Resources

About