Effects of nanoparticles size and concentration and laser power on nonlinear optical properties of Au and Au–CdSe nanocrystals

Salah, Akram; Mansour, Ahmed S.; Mohamed, Mona; Azzouz, I.M.; Hassab-Elnaby, Salah; Badr, Y.

doi:10.1016/j.apsusc.2015.06.060

Cited by 32 publications

(12 citation statements)

References 26 publications

(23 reference statements)

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“…[96][97][98] The combination of nanometals and semiconductors has acquired particular interest for basic sciences and technological applications. 99,100 In the study reported by Salah et al, 101 Au NPs and nanocomposite of Au-CdSe of different NPs sizes and concentrations were prepared.…”

Section: Size (Nm)mentioning

confidence: 99%

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Nonlinear optical properties of metal nanoparticles: a review

2017

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Metal nanoparticles (MNPs) hold great technological promise because of the possibility of engineering their electronic and optical properties through material design. One of the effective methods to fabricate MNPs is ion implantation. In this review, recent results on the nonlinear optical properties of nanoparticles (including copper, silver, gold, and bismuth nanoparticles) doped in various bases have been discussed. Some specific optical nonlinear properties, such as nonlinear refraction, two-photon absorption, and optical limiting, for femtosecond, picosecond, and nanosecond laser pulses have also been covered. In addition to ion implantation, we have summarized several other methods for the preparation of composite materials, and Z-scan has been used to study the nonlinear optical properties of these materials.

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Section: Size (Nm)mentioning

confidence: 99%

“…OA Z-scan transmission of Au-CdSe at 0.31 GW cm À2 for different concentrations of CdSe (3.54 nm) 101. …”

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confidence: 99%

Nonlinear optical properties of metal nanoparticles: a review

2017

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“…The nonlinear absorption coefficient β and the nonlinear refraction index γ were calculated to be −6.5 × 10 −14 m/w and 3.0 × 10 −20 m 2 /w, the third-order nonlinear susceptibility of the glass sample was estimated to be χ (3) = 1.7 × 10 −14 esu. As the estimated nonlinear optical properties are affected by many factors such as nanoparticle size and concentration, laser power, and repetition rate of lasers [22,24], this study paves the way for more detailed researches in the future. With further improvement, the glass may have potential application in nonlinear optics.…”

Section: Discussionmentioning

confidence: 93%

“…The ultrafast electronic nonlinearity was associated to the optical Kerr effect for the time-resolved optical Kerr gate and Z-scan techniques (825 nm, 80 fs), while a thermal effect was identified as the main mechanism responsible for the nonlinear optical refraction induced by nanosecond pulses (532 nm, 1 ns). Abeer Salah et al [24] synthesized Au and Au-CdSe nanoparticles (NPs) at different NP sizes and concentrations by organometallic pyrolysis method and they conducted OA Z-scan measurements by a Q-switched Nd-YAG laser (532 nm, 6 ns) as a function of excitation energy. The result showed that the location of SP energy and excitonic peak shifted from 538 to 613 nm as the NP size increased and saturation absorption was reversed by increasing power densities.…”

Section: +mentioning

confidence: 99%

Sol-gel synthesis and third-order optical nonlinearity of Au nanoparticles doped monolithic glass

Gao

Xiang

et al. 2015

Gold Bull

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Gold nanoparticles (Au NPs) doped monolithic and transparent sodium borosilicate glass has been synthesized by both sol-gel and atmosphere control heat treatment methods. Fourier transform infrared (FTIR) spectra in the wavenumber range of 400 to 4000 cm −1 were applied to collect variation information of surface groups of the samples in the sintering process. The microstructure of Au NPs in the glass was characterized by means of X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and high-resolution TEM (HRTEM). Meanwhile, the linear optical properties of the glass were analyzed by UV-vis spectrometer between the wavelength of 300 and 1000 nm, and a broad absorption band around 600 nm was observed. The third-order nonlinear optical properties of the glass were investigated by using Z-scan technique at the wavelength of 800 nm, pulse duration of 190 fs, and repetition rate of 20 Hz. The glass showed saturable absorption and self-focusing nonlinear refraction, and the optical nonlinear susceptibility χ (3) was estimated to be 1.7 × 10 −14 esu, with the single-pulse energy of 1 μJ.

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“…A simple open aperture z-scan setup was used to study the nonlinear optical properties of magnetic-plasmonic nanoparticles with different thicknesses of gold on the magnetic, Fe 3 O 4 nanoparticle core. The methodology employed by Salah et al [ 22 ] to study CdSe-Au nanocrystals is applied in this work. The aforementioned optical parametric oscillator laser system is used, with the output tuned to 690 nm to probe as close as possible to the absorption of the nanostructure.…”

Section: Methodsmentioning

confidence: 99%

Dark Field and Coherent Anti-Stokes Raman (DF-CARS) Imaging of Cell Uptake of Core-Shell, Magnetic-Plasmonic Nanoparticles

et al. 2021

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Magnetic-plasmonic, Fe3O4-Au, core-shell nanoparticles are popular in many applications, most notably in therapeutics and diagnostics, and thus, the imaging of these nanostructures in biological samples is of high importance. These nanostructures are typically imaged in biological material by dark field scatter imaging, which requires an even distribution of nanostructures in the sample and, therefore, high nanoparticle doses, potentially leading to toxicology issues. Herein, we explore the nonlinear optical properties of magnetic nanoparticles coated with various thicknesses of gold using the open aperture z-scan technique to determine the nonlinear optical properties and moreover, predict the efficacy of the nanostructures in nonlinear imaging. We find that the magnetic nanoparticles coated with gold nanoseeds and thinner gold shells (ca. 4 nm) show the largest nonlinear absorption coefficient β and imaginary part of the third-order susceptibility Im χ(3), suggesting that these nanostructures would be suitable contrast agents. Next, we combine laser dark field microscopy and epi-detected coherent anti-Stokes Raman (CARS) microscopy to image the uptake of magnetic-plasmonic nanoparticles in human pancreatic cancer cells. We show the epi-detected CARS technique is suitable for imaging of the magnetic-plasmonic nanoparticles without requiring a dense distribution of nanoparticles. This technique achieves superior nanoparticle contrasting over both epi-detected backscatter imaging and transmission dark field imaging, while also attaining label-free chemical contrasting of the cell. Lastly, we show the high biocompatibility of the Fe3O4 nanoparticles with ca. 4-nm thick Au shell at concentrations of 10–100 µg/mL.

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Effects of nanoparticles size and concentration and laser power on nonlinear optical properties of Au and Au–CdSe nanocrystals

Cited by 32 publications

References 26 publications

Nonlinear optical properties of metal nanoparticles: a review

Nonlinear optical properties of metal nanoparticles: a review

Sol-gel synthesis and third-order optical nonlinearity of Au nanoparticles doped monolithic glass

Dark Field and Coherent Anti-Stokes Raman (DF-CARS) Imaging of Cell Uptake of Core-Shell, Magnetic-Plasmonic Nanoparticles

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