Influence of Hermanson's Dielectric Screening Function on the Nonlinear Optical Properties of Impurity Doped Quantum Dots in Presence of Gaussian White Noise

2017 ◽  
Vol 6 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Aindrila Bera ◽  
Surajit Saha ◽  
Jayanta Ganguly ◽  
Manas Ghosh
Keyword(s):  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Optical Absorption Coefficient ◽  
Optical Rectification ◽  
Related Field ◽  
Nlo Properties ◽  
Mode Of Application ◽  
Dielectric Screening ◽  
Impurity Doped

We study the modulation of various nonlinear optical (NLO) properties of impurity doped quantum dot (QD) under the influence of position-dependent dielectric screening function (PDDSF) in presence and absence of noise. The NLO properties include total optical absorption coefficient (TOAC), total refractive index change (TRIC), nonlinear optical rectification (NOR), second harmonic generation (SHG), and third harmonic generation (THG). The profiles of above NLO properties have been analysed as a function of incident photon energy using both static dielectric constant (SDC) and PDDSF. Noise function assumes a Gaussian distribution and applied to the system additively as well as multiplicatively. Critical comparison among the profiles of above NLO properties using SDC and PDDSF has been conducted to realize the role of the latter. In addition, the role of mode of application of noise (additive/multiplicative) on the said profiles has also been explored. The profiles are found to display shift of peak position, amplification, diminish, and maximization of peak values under different conditions. The observations reveal subtle interplay between noise and PDDSF in tailoring the intricate features of various NLO properties and bear importance in the related field of research.

Exploring Optical Dielectric Function of Impurity Doped Quantum Dots in Presence of Gaussian White Noise

2017 ◽  
Vol 6 (1) ◽  
pp. 48-55
Author(s):  
Surajit Saha ◽  
Suvajit Pal ◽  
Jayanta Ganguly ◽  
Manas Ghosh
Keyword(s):  
White Noise ◽  
Dielectric Function ◽  
Gaussian White Noise ◽  
Peak Height ◽  
Peak Position ◽  
Doped Quantum Dots ◽  
Mode Of Application ◽  
Impurity Doped ◽  
Optical Dielectric

We investigate the total optical dielectric function (TODF) of impurity doped quantum dot (QD) in presence and absence of noise. Noise invoked is Gaussian white noise and the QD is doped with Gaussian impurity. Noise has been introduced to the system additively and multiplicatively. The TODF profiles have been monitored as a function of incident photon energy for different values of several important parameters. Moreover, the role of mode of application of noise (additive/multiplicative) on the TODF profiles has also been meticulously analyzed. We have found that the shift of TODF peak position and change in TODF peak height sensitively depend on presence/absence of noise and also on its mode of application. Introduction of multiplicative noise causes greater deviation of TODF profiles from that of noise-free condition than using additive noise.

scholarly journals The Role of Surface Plasmon Resonance of Gold Nanoparticles for the Enhancement of Second Harmonic Generation of Nonlinear Chromophores

Inorganics ◽  
2019 ◽  
Vol 7 (5) ◽  
pp. 64 ◽  
Author(s):  
Anu Singh Bisht ◽  
Khuyen Hoang-Thi ◽  
Isabelle Ledoux-Rak ◽  
Hynd Remita ◽  
Frédéric Dumur ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Phenyl Ring ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Nlo Response ◽  
Spherical Gold Nanoparticles

A significant enhancement of the second harmonic generation (SHG) from second-order nonlinear optical (NLO) dyes in solution has been evidenced when these dyes were grafted onto the surface of spherical gold nanoparticles (AuNPs), as compared to their NLO response without AuNPs. The length, as well as the nature of the spacers between the gold particle and the chromophore, is shown to play an important role, a benzene linker being more favorable to AuNP-4-dimethylamino-N-methyl-4-stilbazolium tosylate (DAST) interactions, as illustrated by a higher exaltation of the NLO response for DAST molecules linked to AuNP via a phenyl ring as compared to their equivalent with a CH2–CH2 link.

Simultaneous effects of hydrostatic pressure, temperature and aluminum concentration on nonlinear optical rectification, second- and third-harmonic generation in a GaAs/Ga1−xAlxAs morse quantum well

2019 ◽  
Vol 33 (04) ◽  
pp. 1950009 ◽  
Author(s):  
Jun-Sheng Li ◽  
Zhi-Hai Zhang ◽  
You-Wen Liu ◽  
Jian-Hui Yuan
Keyword(s):  
Hydrostatic Pressure ◽  
Quantum Well ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Great Influence ◽  
Third Harmonic Generation ◽  
Aluminum Concentration ◽  
Optical Rectification ◽  
Third Harmonic ◽  
Nonlinear Optical Rectification

In this work, the simultaneous effects of aluminum concentration, hydrostatic pressure and temperature on the nonlinear optical rectification (OR), second- and third-harmonic generation (SHG and THG) in a GaAs/Ga[Formula: see text]Al[Formula: see text]As morse quantum well (QW) are studied. The expressions of OR, SHG and THG in morse QW were derived with the use of the compact-density-matrix approach and iterative method. The simultaneous effects of aluminum concentration, hydrostatic pressure and temperature on the effective mass have been taken into account. It is found that (1) the presence of the aluminum concentration, hydrostatic pressure and temperature have a great influence on the symmetry of the system, the nonlinear OR, SHG and THG. (2) the variation of the resonant peaks of the OR and SHG shows complicated behavior as the temperature changes. (3) the temperature effect is weaker than the aluminum concentration and hydrostatic pressure effects on the nonlinear OR, SHG and THG. The influences of different parameters of GaAs/Ga[Formula: see text]Al[Formula: see text]As morse QW and applied field strengths on the nonlinear OR, SHG and THG are discussed.

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