Nonlinear Optical Properties and Cytotoxicity Studies of Fruit Extract Synthesized Silver and Gold Nanostructures

2021 ◽  
pp. 2150031
Author(s):  
E. Ramya ◽  
L. Jyothi ◽  
Narayana Rao Desai
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Punica Granatum ◽  
Antimicrobial Activities ◽  
Nonlinear Optical Properties ◽  
Ag Nps ◽  
Au Nps ◽  
Transmission Electron ◽  
Cytotoxicity Studies ◽  
Visible Spectra

Eco-friendlybiosynthesis of silver nanoparticles (Ag NPs) and gold (Au NPs) nanoparticles by using Punica granatum and C. reticulata extracts were synthesized efficiently. Ag and Au NPs with sizes 8–10 nm and 30–40 nm were successfully synthesized and extracts serve as capping agents. Forming of NPs was confirmed through UV-visible spectra, transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectra (FTIR) studies. The effect of NPs on the luminescence of Eu(TTFA)3 and Sm(TTFA)3 complexes was investigated. Luminescence intensities of the complexes were enhanced several times in the presence of silver and get quenched due to reabsorption of Au NPs. The nonlinear optical properties of NPs were calculated using open aperture Z-scan and degenerate four-wave mixing in the femtosecond region. The toxicity and antimicrobial activities of Ag and Au NPs were studied.

scholarly journals Characterization of the Optical Nonlinearities of Silver and Gold Nanoparticles

2019 ◽  
Vol 127 (9) ◽  
pp. 453
Author(s):  
R.A. Ganeev
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Transient Absorption ◽  
Nonlinear Optical Properties ◽  
Ag Nps ◽  
Electron Phonon Interaction ◽  
High Order Harmonic ◽  
Absorption Studies ◽  
Gold Nps ◽  
Variable Morphology

The synthesis of nanostructured materials took much attention due to their advanced optical and nonlinear optical properties, which can be used in various areas of communications, optics, laser physics and medicine. During last two decades, special attention was given to the nonlinear optical properties of the nanoparticles (NPs) of variable morphology. Here we review the recent studies of the nonlinear optical properties of silver and gold NPs. We discuss the Z-scans and pump-probe transient absorption studies allowing determining the nonlinear refractive indices, nonlinear absorption coefficients and electron-phonon interaction times. The analysis of the low- and high-order harmonic generation in the laser-produced plasmas containing Ag NPs and Au NPs is also presented.

Nonlinear Optical Properties of CdSe Quantum Dots Having Different Sizes

2020 ◽  
Vol 20 (12) ◽  
pp. 7710-7715
Author(s):  
Emusani Ramya ◽  
Dushyant Kushavah ◽  
M. Veeramohan RaO ◽  
T. Arun Kumar ◽  
D. Narayana Rao
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Picosecond Laser ◽  
Nonlinear Optical Properties ◽  
Cdse Qds ◽  
Linear Absorption ◽  
Visible Absorption ◽  
Transmission Electron ◽  
Cadmium Selenide Quantum Dots

We synthesis different sizes of cadmium selenide quantum dots (CdSe QDs) and their linear and nonlinear optical properties. Size-controlled CdSe QDs are characterized by ultraviolet-visible absorption, photoluminescence, transmission electron microscope (TEM), and Z-scan techniques. Redshift was observed in the linear absorption and photoluminescence with an increase in the size of CdSe QDs. TEM images show the sizes of the QDs are 2.2 nm–4.9 nm. Bandgap tuning CdSe QDs of third-order nonlinear optical properties are investigated at 532 nm with an open aperture Z-scan technique using a picosecond laser. These CdSe QDs can be used as optical limiters.

Nonlinear optical properties of Ag-enriched ZnO nanostructures

2019 ◽  
Vol 28 (03) ◽  
pp. 1950027 ◽  
Author(s):  
Emusani Ramya ◽  
M. Veeramohan Rao ◽  
D. Narayana Rao
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Visible Region ◽  
Picosecond Laser ◽  
Nonlinear Optical Properties ◽  
Zno Nps ◽  
Electron Microscopic ◽  
Two Photon ◽  
Transmission Electron ◽  
Novel Method

Ag-enriched ZnO nanoparticles (NPs) are prepared by using silver nitrate, zinc acetate, and N,N-dimethylformamide (DMF) as source elements, a novel method under particular conditions without any additives added as stabilizing or reducing agent. The transmission electron microscopic (TEM) studies reveal that the ZnO layer is well formed onto the Ag core. The photoluminescence shows the energy transfer and electron-hole recombination between the conductor and semiconductor layers. Nonlinear optical properties are studied by using picosecond laser. Nonlinear absorption values are increased by increasing the Ag concentration in Ag-enriched ZnO NPs. Nonlinear optical effects in Ag-enriched ZnO NPs are due to two-photon induced free carrier and inter-band transitions. Optical limiting characteristics are measured in the picosecond time domain. Ag-enriched ZnO NPs are used as optical limiters in the visible region.

MAGNETIC FIELD, PRESSURE AND TEMPERATURE DEPENDENT OPTICAL PROPERTIES IN A GaAs 9.0 P 1.0 QUANTUM DOT

2014 ◽  
Vol 6 (2) ◽  
pp. 1178-1190
Author(s):  
A. JOHN PETER ◽  
Ada Vinolin
Keyword(s):  
Magnetic Field ◽  
Optical Properties ◽  
Quantum Dot ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Photon Energy ◽  
Nonlinear Optical ◽  
Binding Energies ◽  
Nonlinear Optical Properties ◽  
Optical Rectification

Simultaneous effects of magnetic field, pressure and temperature on the exciton binding energies are found in a 9.0 1.0 6.0 4.0 GaAs P / GaAs P quantum dot. Numerical calculations are carried out taking into consideration of spatial confinement effect. The cylindrical system is taken in the present problem with the strain effects. The electronic properties and the optical properties are found with the combined effects of magnetic field strength, hydrostatic pressure and temperature values. The exciton binding energies and the nonlinear optical properties are carried out taking into consideration of geometrical confinement and the external perturbations.Compact density approach is employed to obtain the nonlinear optical properties. The optical rectification coefficient is obtained with the photon energy in the presence of pressure, temperature and external magnetic field strength. Pressure and temperature dependence on nonlinear optical susceptibilities of generation of second and third order harmonics as a function of incident photon energy are brought out in the influence of magnetic field strength. The result shows that the electronic and nonlinear optical properties are significantly modified by the applications of external perturbations in a 9.0 1.0 6.0 4.0 GaAs P / GaAs P quantum dot.

Linear and Nonlinear Optical Properties of Small Silicon Clusters

1990 ◽  
Author(s):  
Tapio T. Rantala ◽  
Mark I. Stockman ◽  
Daniel A. Jelski ◽  
Thomas F. George
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Silicon Clusters ◽  
Linear And Nonlinear
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