Nonlinear Refraction in Colloidal Silver Sulfide Quantum Dots

Zvyagin, A. I.; Chevychelova, T. A.; Grevtseva, I. G.; Selyukov, A. S.; Ovchinnikov, O. V.; Ganeev, R. A.

doi:10.1007/s10946-020-09923-4

Cited by 13 publications

(3 citation statements)

References 31 publications

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“…В работе [34] на основании решения уравнения тепловой диффузии показано, что в условиях проводимого эксперимента тепловая дефокусировка не наблюдается или имеет величину меньше порога регистрации аппаратуры, а нелинейная рефракция обусловлена заполнением локализованных состояний структурных дефектов под воздействием лазерного излучения.…”

Section: результаты и их обсуждениеunclassified

Динамика наведенного поглощения и нелинейно-оптический отклик в коллоидных квантовых точках Ag-=SUB=-2-=/SUB=-S

Смирнов¹,

Овчинников²,

Звягин³

et al. 2022

Оптика И Спектроскопия

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The mechanism of formation of the nonlinear optical response of colloidal solutions of Ag2S quantum dots passivated with thioglycolic acid molecules is considered. Using the Z-scan method for 10 ns pulses of the second harmonic of a YAG:Nd laser, the appearance of nonlinear absorption and nonlinear refraction is shown. A saturating dependence of the absorption coefficient with an increase in the intensity of the incident radiation is found. An assumption was made about the participation in the process of nonlinear absorption of localized states of levels of Ag2S structural defects, including the defect luminescence center, which was confirmed by femtosecond induced absorption spectroscopy. The formation of a broad structureless induced absorption band in the 500–1000 nm region is shown, which decays on a time scale of hundreds of picoseconds. It is concluded that the induced absorption signal is determined by the fast (within fractions of picoseconds) process of charge carrier capture by localized states, which subsequently determine the nonlinear absorption of 10 ns pulses.

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Section: результаты и их обсуждениеunclassified

Динамика наведенного поглощения и нелинейно-оптический отклик в коллоидных квантовых точках Ag-=SUB=-2-=/SUB=-S

Смирнов¹,

Овчинников²,

Звягин³

et al. 2022

Оптика И Спектроскопия

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“…It has been recognized in past decades that nanoparticle suspensions consisting of various materials, including metal, semiconductor, dielectric, and even organic and biological structures reveal extraordinary nonlinear optical properties [ 1 , 2 , 3 ]. Observation of Stimulated Rayleigh–Mie Scattering (SRMS) in two-photon absorbing nanocolloids becomes one of the very fascinating novelties in modern nonlinear optics [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths

et al. 2022

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Recent discoveries in nonlinear optical properties of nanoparticle colloids make actual the challenge to lower the energy threshold of phase conjugation and move it into the domain of shorter pulse widths. A novel effect of the stimulated Rayleigh-Mie scattering (SRMS) in two-photon absorbing nanocolloids is considered as a promising answer to this challenge. We report the results of experimental and theoretical study of the two-photon-assisted SRMS in Ag and ZnO nanocolloids in the nanosecond-to-picosecond pulse width domain. For 12 ns 0.527 μm laser pulses, the four-wave mixing SRMS scheme provides lasing and amplification of backscattered anti-Stokes signal in Ag nanocolloids in toluene at the threshold 0.2 mJ and the spectral shifts up to 150 MHz. For 100 ps 0.532 μm pulses, we observed for the first time efficient (over 50% in signal-to-pump ratio of pulse energies) SRMS backscattering of the anti-Stokes signal in Ag nanocolloids in toluene and predominantly Stokes signal in ZnO nanocolloids in water, with the spectral shifts up to 0.25 cm−1. We develop the first order-in-perturbation model of the four-wave mixing two-photon absorption-assisted SRMS process which shows that at nanosecond pulses, amplification is predominantly due to the thermal-induced coherent oscillations of polarization while the slow temperature wave acts also as a dynamic spatial grating which provides a self-induced optical cavity inside the interaction region. At a picosecond pulse width, according to our model, the spectral overlap between pump and signal pulses results in formation of only the dynamic spatial temperature grating, and we succeeded at recovering the linear growth of the spectral shift with the pump power near the threshold.

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“…Over the past decade, plasmonic nanoantennas based on nanoparticle-on-mirror (or nanopatch antenna, NPA) have been extensively studied and their efficiency for nanophotonic applications, including plasmonic sensors [1][2][3], super absorbers [4][5][6], structures for second-harmonic generation enhancement [7] and light-emitting elements [8][9][10][11], has been demonstrated. Furthermore, using a nanopatch antenna, photons were generated with a high repetition frequency (up to 10-100 ps) with various emitters, such as organic molecules [12][13][14], nanodiamonds with nitrogen-vacancy (NV) centers [15], two-dimensional semiconductors [16], and quantum dots (QDs) [17][18][19][20] that also been proved to be efficient as active emitting layers of hybrid organic-inorganic light-emitting diodes [21,22] and as nonlinear optical materials [23][24][25]. Moreover, nanopatch antennas with single QDs [26] and NV centers [15] can generate single photons.…”

Section: Introductionmentioning

confidence: 99%

Hybrid cube-in-cup nanoantenna: towards ordered photonics

Gritsienko¹,

Kurochkin²,

Lega³

et al. 2021

Nanotechnology

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The most significant goal of nanophotonics is the development of high-speed quantum emitting devices operating at ambient temperature. In this regard, plasmonic nanoparticles-on-mirror are potential candidates for designing high-speed photon sources. We introduce a novel hybrid nanoantenna (HNA) with CdSe/CdS colloidal quantum dots (QDs) based on a silver nanocube in a metal cup that presents a nanoparticle-in-cavity coupled with an emitters system. We use focused ion beam nanolithography to fabricate an ordered array of cups, which were then filled with colloidal nanoparticles using the most simple drop-casting and spin coating methods. The spectral and time-resolved studies of the samples with one or more nanocubes in the cup reveal a significant change in the radiation characteristics of QDs inside the nanoantenna. The Purcell effect causes an increase in the fluorescence decay rate (≥30) and an increase in the fluorescence intensity (≥3) of emitters in the HNA. Using the finite element method simulations, we have discovered that the proximity of the cups wall affects the oscillation modes of the gap plasmon, which, in turn, leads to changes in the electric field enhancement inside the nanoantenna gap. Additionally, substantial variations in the behavior of the gap plasmons at different polarizations of the exciting radiation have been revealed. The proposed nanoantenna can be useful in the development of plasmonic sensors, display pixels, and single-photon sources.

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Nonlinear Refraction in Colloidal Silver Sulfide Quantum Dots

Cited by 13 publications

References 31 publications

Динамика наведенного поглощения и нелинейно-оптический отклик в коллоидных квантовых точках Ag-=SUB=-2-=/SUB=-S

Динамика наведенного поглощения и нелинейно-оптический отклик в коллоидных квантовых точках Ag-=SUB=-2-=/SUB=-S

Stimulated Thermal Scattering in Two-Photon Absorbing Nanocolloids under Laser Radiation of Nanosecond-to-Picosecond Pulse Widths

Hybrid cube-in-cup nanoantenna: towards ordered photonics

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