OPTICALLY-OPERATED ELASTOOPTICAL EFFECTS IN POLYMER MATRICES WITH NANOCRYSTALLITES

2011 ◽  
Vol 04 (04) ◽  
pp. 357-359 ◽  
Author(s):  
I. V. KITYK ◽  
N. ALZAYED ◽  
A. H. RESHAK ◽  
K. J. PLUCINSKI ◽  
J. BERDOWSKI ◽  
...  
Keyword(s):  
Polymer Nanocomposites ◽  
Polymer Matrices ◽  
Laser Beams ◽  
Optical Treatment ◽  
Nanoparticle Content ◽  
532 Nm

We have found that the optical treatment by bicolor two laser beams at 1064 and 532 nm, at energy densities 80–120 mJ/cm2 originating from the same 10 ns Nd3+ garnett lasers causes the occurrence of the piezooptical effect in 50–80 nm γ-glicyne polymer nanocomposites at nanoparticle content about 6.5% in weighting unit. We propose to use this effect for optical triggers.

Relaxation Polarization Dependence of Circular Vector Gratings in Azobenzene Glassy Molecular Films

2020 ◽  
Vol 850 ◽  
pp. 285-290
Author(s):  
Andris Ozols ◽  
Peteris Augustovs ◽  
Kaspars Traskovskis ◽  
Valdis Kokars ◽  
Lauma Laipniece ◽  
...  
Keyword(s):  
Diffraction Efficiency ◽  
Relaxation Times ◽  
Grating Period ◽  
Volume Density ◽  
Laser Beams ◽  
Relaxation Polarization ◽  
Polarized Beam ◽  
Sandwich Type ◽  
Phd Thesis ◽  
532 Nm

Holographic grating recording and relaxation is studied in different azobenzene molecular glassy films by circularly orthogonally polarized 532 nm laser beams L and R. The readout was made by circularly polarized (R or L) 632.8 nm laser beam. Sandwich-type samples (glass-film-glass) were also studied. Maximum diffraction efficiency of 81% has been achieved in sandwich-type AR-173 film. The following relaxation features have been found: after reaching diffraction efficiency (DE) maximum no DE decay took place; DE read out by R-polarized beam was always higher than that by L-polarized beam; in sandwich-type samples DE decayed until zero when read out by R-polarization whereas DE was zero when read out by L-polarization. 50% relaxation times varied from 4 to 44 minutes, and they mainly decreased when grating period was increased. The observed relaxation peculiarities can be understood if one assumes that volume birefringence grating (VBG) is recorded followed by volume density grating (VDG) and surface relief grating (SRG) recording. R-polarization "feels" all gratings whereas L-polarization only VDG and SRG. At large exposures VDG and SRG dominate. These results confirm the conclusion made by J.Mikelsone in her 2018 PhD thesis that birefringence grating recording in azobenzene materials is a neccessary condition for SRG appearance.

BICOLOR OPTICAL TREATMENT OF MULTI-LAYERS FILM SAMPLES

2010 ◽  
Vol 24 (08) ◽  
pp. 937-942 ◽  
Author(s):  
K. OZGA ◽  
J. EBOTHÉ ◽  
H. NGUYEN CONG ◽  
D. MARTEL ◽  
W. GRUHN ◽  
...  
Keyword(s):  
Electric Field ◽  
Power Density ◽  
Local Heating ◽  
Independent Measurement ◽  
Yag Lasers ◽  
Optical Susceptibility ◽  
Dc Electric Field ◽  
Optical Treatment ◽  
532 Nm ◽  
Multi Layer Film

In the present paper, we study the influence of simultaneous polarized optical treatment (10 ns Nd: YAG lasers with wavelengths 1064 nm and 532 nm with power density 0.6 GW/cm2) together with electrostatic dc electric field (up to 8 kV/cm) on self-assembled multi-layer film samples. The second-order optical susceptibility (SOS) achieves the maximal values after one minute simultaneous dc electrical-optical treatment. Further treatment will not enhance the values and even leads to the decrease of SOS. The independent measurement of the local temperature shows that local heating does not exceed 10.1 K.

Designing high performance polymer nanocomposites by incorporating robustness-controlled polymeric nanoparticles: insights from molecular dynamics

2022 ◽  
Author(s):  
Guangyi Hou ◽  
Sai Li ◽  
Jun Liu ◽  
Yun-Xuan Weng ◽  
Liqun Zhang
Keyword(s):  
Molecular Dynamics ◽  
Polymer Nanocomposites ◽  
High Performance ◽  
Polymeric Nanoparticles ◽  
Polymer Nanoparticles ◽  
Polymer Matrices ◽  
Interesting Topic ◽  
High Performance Polymer

Introducing polymer nanoparticles into polymer matrices is an interesting topic, and the robustness of polymeric nanoparticles is very crucial for the properties of polymer nanocomposites (PNCs). In this study, by...

scholarly journals Investigation of the properties of nanographene in polymer nanocomposites through molecular simulations: dynamics and anisotropic Brownian motion

2019 ◽  
Vol 21 (43) ◽  
pp. 23843-23854 ◽  
Author(s):  
Anastassia N. Rissanou ◽  
Petra Bačová ◽  
Vagelis Harmandaris
Keyword(s):  
Molecular Dynamics ◽  
Brownian Motion ◽  
Molecular Dynamics Simulations ◽  
Polymer Nanocomposites ◽  
Dynamical Behavior ◽  
Molecular Simulations ◽  
Polymer Matrices ◽  
Dynamics Simulations

The dynamical behavior of nanographene sheets dispersed in polymer matrices is investigated through united-atom molecular dynamics simulations.

The Effect of Laser Wavelength and Concentration on Thermal Nonlinear Refractive Index of Graphene Suspensions

NANO ◽  
2015 ◽  
Vol 10 (04) ◽  
pp. 1550053 ◽  
Author(s):  
A. Arandian ◽  
R. Karimzadeh ◽  
S. Y. Faizabadi
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Continuous Wave ◽  
Concentration Level ◽  
Laser Wavelength ◽  
Laser Beams ◽  
Power Laser ◽  
Wave Regime ◽  
532 Nm ◽  
Concentration Levels

In this work, the nonlinear refractive properties of graphene suspension at different concentration levels are investigated by means of Z-scan technique with continuous wave low power laser beams at 532 nm and 635 nm. Results show that the dispersion of graphene in water exhibits negative nonlinear refractive index in continuous wave regime, which is mainly attributed to thermal nonlinear effect. We find that the absorption coefficient and nonlinear refractive index of the samples increase with increasing the concentration level of the graphene. Moreover, it is obtained that the nonlinear refractive index of the samples at different concentration levels depends on the wavelength of laser beam.

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