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.

scholarly journals Scalable Production of Boron Quantum Dots for Broadband Ultrafast Nonlinear Optical Performance

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 687
Author(s):  
Shuolei Meng ◽  
Qianyuan Chen ◽  
Hongjian Lin ◽  
Feng Zhou ◽  
Youning Gong ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Relaxation Time ◽  
Nonlinear Optical ◽  
Average Diameter ◽  
Optical Devices ◽  
Nonlinear Optical Properties ◽  
Saturable Absorption ◽  
Nonlinear Optical Susceptibility ◽  
Tandem Structure

A simple and effective approach based on the liquid phase exfoliation (LPE) method has been put forward for synthesizing boron quantum dots (BQDs). By adjusting the interactions between bulk boron and various solvents, the average diameter of produced BQDs is about 7 nm. The nonlinear absorption (NLA) responses of as-prepared BQDs have been systematically studied at 515 nm and 1030 nm. Experimental results prove that BQDs possess broadband saturable absorption (SA) and good third-order nonlinear optical susceptibility, which are comparable to graphene. The fast relaxation time and slow relaxation time of BQDs at 515 nm and 1030 nm are about 0.394–5.34 ps and 4.45–115 ps, respectively. The significant ultrafast nonlinear optical properties can be used in optical devices. Here, we successfully demonstrate all-optical diode application based on BQDs/ReS2 tandem structure. The findings are essential for understanding the nonlinear optical properties in BQDs and open a new pathway for their applications in optical devices.

scholarly journals Electronic properties and third-order optical nonlinearities in tetragonal chalcopyrite AgInS2, AgInS2/ZnS and cubic spinel AgIn5S8, AgIn5S8/ZnS quantum dots

2017 ◽  
Vol 5 (1) ◽  
pp. 149-158 ◽  
Author(s):  
Bartłomiej Cichy ◽  
Dominika Wawrzynczyk ◽  
Marek Samoc ◽  
Wiesław Stręk
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Electronic Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Optical Nonlinearities ◽  
Third Order

Electronic as well as third-order nonlinear optical properties of chalcopyrite AgInS2 and non-stoichiometric spinel AgIn5S8 quantum dots compared with corresponding Zn2+ alloyed compounds are presented in this work.

Third-Order Nonlinear Optical Properties of Infrared Emitting PbS and PbSe Quantum Dots

2016 ◽  
Vol 120 (38) ◽  
pp. 21939-21945 ◽  
Author(s):  
Dominika Wawrzynczyk ◽  
Janusz Szeremeta ◽  
Marek Samoc ◽  
Marcin Nyk
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Third Order

scholarly journals Nonlinear Optical Properties of Spheroidal Metallic Inclusions in a Dielectric Medium

2011 ◽  
Vol 2011 ◽  
pp. 1-9
Author(s):  
Bernard de Dormale ◽  
Vo-Van Truong
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Symmetry Axis ◽  
Rotational Symmetry ◽  
Strong Dependence ◽  
Wavelength Region ◽  
Nonlinear Optical Properties ◽  
Linear Absorption ◽  
Direction Parallel ◽  
Depolarization Factor

A model for linear and nonlinear optical properties of a composite material consisting of spheroidal metal inclusions embedded in a host medium has been formulated using an effective medium approach. Both aligned and randomly oriented spheroids have been considered, and the results obtained showed a considerable difference between the two situations. Numerical calculations for metallic Au inclusions in a glass matrix have shown that the linear absorption in the case of aligned spheroids with their symmetry axis parallel to the z-axis is largely dependent on the depolarization factor, exhibiting an absorption in the vicinity of 500 nm when the depolarization factor in the direction parallel to the rotational symmetry axis is small. This structure shifts progressively to higher wavelengths when this depolarization factor is increased. In the case of randomly oriented spheroids, contributions from the different particle depolarization factors are present and prominent structures in the linear absorption appear in the long wavelength region, beyond 700 nm. Nonlinear optical properties for both aligned and randomly oriented spheroids also show a strong dependence on the depolarization factor and significant enhancements of these properties can be observed, suggesting possible tailoring of composite properties for various applications.

Nonlinear Optical Properties of II–VI Semiconductor Quantum Dots

1993 ◽  
pp. 133-139
Author(s):  
A. Uhrig ◽  
A. Wörner ◽  
M. Saleh ◽  
C. Klingshirn ◽  
N. Neuroth ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Semiconductor Quantum Dots ◽  
Nonlinear Optical Properties
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