THRESHOLD-TUNABLE OPTICAL LIMITERS OF Au NANOPARTICLES IN CASTOR OIL

2012 ◽  
Vol 21 (02) ◽  
pp. 1250024 ◽  
Author(s):  
HODA ALEALI ◽  
LEILA SARKHOSH ◽  
ROUHOLLAH KARIMZADEH ◽  
NASTARAN MANSOUR
Keyword(s):  
Gold Nanoparticle ◽  
Castor Oil ◽  
Nonlinear Refraction ◽  
Optical Limiting ◽  
Nanoparticle Concentration ◽  
Non Local ◽  
Set Up ◽  
532 Nm ◽  
Limiting Threshold ◽  
Good Agreement

Optical limiting performance of gold nanoparticles (AuNPs) in castor oil is studied using a low power laser irradiation at 532 nm. Our results suggest that it is possible to tune the optical limiting threshold of the AuNPs by modifying the parameters of the set-up and gold nanoparticle concentration of the colloids. The closed Z-scan measurements reveal that non-local thermal nonlinear refraction process is responsible for the limiting action of the colloids. We have investigated the Z-scan behavior of the samples based on the non-local thermal nonlinear refraction process without using photo-thermal thin lens approximation. It is shown that this model is in good agreement with the experimental results and large enhancement factors are measured for values of nonlinear thermal refractive index and thermo-optical coefficients of the colloids at higher gold nanoparticle concentration compared to the measurement of castor oil.

Analysis of Z-scan measurement for large thermal nonlinear refraction in gold nanoparticle colloid

2015 ◽  
Vol 24 (02) ◽  
pp. 1550014 ◽  
Author(s):  
Leila Sarkhosh ◽  
Nastaran Mansour
Keyword(s):  
Phase Shift ◽  
Gold Nanoparticle ◽  
Nonlinear Refraction ◽  
Optical Limiting ◽  
Diffraction Theory ◽  
Lens Model ◽  
Nonlinear Phase Shift ◽  
Nonlinear Phase ◽  
Conventional Models ◽  
Limiting Threshold

In this work, based on nonlocal heat effect and Fresnel diffraction theory, the characteristics of closed Z-scan in materials with a large nonlinear phase shift have been studied and a formula for Z-scan transmittance is derived. Numerical computations show that the shapes of Z-scan curves are greatly affected by the values of thermal nonlinear phase shift. The Z-scan behavior is compared to the conventional thermal Z-scan theories, including the thermal thin lens and aberrant thermal lens model. We have used the Z-scan models to determine the nonlinear refraction of gold nanoparticle (AuNP) dispersed in cyclohexanone under irradiation of a low power CW laser at 532 nm. The Z-scan theory based on the conventional models does not fit the experimental data well. It is found that peak-to-valley features of the AuNPs colloid Z-scan curve behave the same as the derived Z-scan theory for large thermal nonlinear phase shift. This allows us to measure nonlinear refractive index up to -1.0 × 10-6 cm2/W in the tested samples. The optical limiting performance of the colloidal AuNPs is also investigated for device application. The results show that the optical limiting threshold of the AuNPs can be improved by making an appropriate choice of design geometry and increasing the AuNPs concentration of the colloids.

Optical Limiting in Solutions of Polycyclic Aromatic Hydrocarbon Diones.

1994 ◽  
Vol 374 ◽  
Author(s):  
L. V. Natarajan ◽  
R. L. Sutherland ◽  
D. McLean ◽  
M. Brant ◽  
D. M. Brandelik ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbon ◽  
Optical Limiting ◽  
Threshold Values ◽  
Limiting Behavior ◽  
Polycyclic Aromatic ◽  
Excitation Laser ◽  
532 Nm ◽  
Limiting Threshold ◽  
Triplet Absorption

AbstractOptical limiting in toluene solutions of substituted benzanthracene- 3,4 diones and three other quinones, namely, benzpyrene-7,8-dione, benzphenanthrene-3,4-dione and chrysene-5,6-dione was investigated at laser wavelengths 532 nm and 694 nm. Low limiting threshold values of the order of 0.01J/cm2 were obtained for some of the quinones at 532nm. Strong triplet-triplet absorption at the excitation laser wavelengths may explain the optical limiting behavior.

NONLINEAR SCATTERING ORIGIN IN CARBON NANOTUBE SUSPENSIONS

2000 ◽  
Vol 09 (03) ◽  
pp. 297-307 ◽  
Author(s):  
L. VIVIEN ◽  
D. RIEHL ◽  
F. HACHE ◽  
E. ANGLARET
Keyword(s):  
Heat Transfer ◽  
Carbon Nanotube ◽  
Bubble Growth ◽  
Optical Limiting ◽  
Nonlinear Scattering ◽  
Pump Probe ◽  
Emission Studies ◽  
532 Nm ◽  
Growth Threshold ◽  
Limiting Threshold

In order to determine the origin of optical limiting in singlewall carbon nanotube (SWNT) suspensions, we carried out Z-scan and pump-probe experiments at 532 nm and 1064 nm, for different input energies. We evidenced strong nonlinear scattering due to heat transfer from the carbon nanotubes to solvent which induced solvent bubble growth and a nonlinear refractive effect. We noticed similar comportment at 1064 nm and at 532 nm, but with a lower bubble growth threshold at 532 nm. At the microsecond timescale, we evidenced cavitation bubbles. We also evidenced, via emission studies, a phase change corresponding to optical limiting threshold, which we associated to carbon nanotube sublimation. Optical limiting performances of water and chloroform suspensions were compared and solvent effects are discussed.

Linear and Nonlinear Optical Properties of Natural Dyes Freestanding Films and Application in Optical Limiting

2020 ◽  
pp. 139-143
Keyword(s):  
Absorption Coefficient ◽  
Water Solution ◽  
Optical Limiting ◽  
Refraction Index ◽  
Laser Wavelength ◽  
Solid State Laser ◽  
Natural Dyes ◽  
Linear And Nonlinear ◽  
532 Nm ◽  
Absorbance Spectra

Natural dyes were followed and prepared from a pomegranate, purple carrot, and eggplant peel. The absorbance spectra was measured in the wavelength range 300-800 nm. The linear properties measurements of the prepared natural dye freestanding films were determined include absorption coefficient (α0), extinction coefficient (κ), and linear refraction index (n). The nonlinear refractive index n2 and nonlinear absorption coefficient β2 of the natural dyes in the water solution were measured by the optical z-scan technique under a pumped solid state laser at a laser wavelength of 532 nm. The results indicated that the pomegranate dye can be promising candidates for optical limiting applications with significantly low optical limiting of 3.5 mW.

scholarly journals Laboratory Measurements of Light Scattering by Dust Particles

1996 ◽  
Vol 150 ◽  
pp. 409-413
Author(s):  
Patrick P. Combet ◽  
Philippe L. Lamy
Keyword(s):  
Light Scattering ◽  
Laser Beam ◽  
Mie Theory ◽  
Spherical Particles ◽  
Dust Particles ◽  
Laboratory Measurements ◽  
Scattering Function ◽  
Hene Laser ◽  
Set Up ◽  
Good Agreement

AbstractWe have set up an experimental device to optically study the scattering properties of dust particles. Measurements over the 8 — 174° interval of scattering angles are performed on a continuously flowing dust loaded jet illuminated by a polarized red HeNe laser beam. The scattering is averaged over the population of the dust particles in the jet, which can be determined independently, and give the “volume scattering function” for the two directions of polarization directly. While results for spherical particles are in good agreement with Mie theory, those for arbitrary particles show conspicuous deviations.

Optical Limiting of a Covalently Bonded Gold Nanoparticle/Polylysine Hybrid Material

2005 ◽  
Vol 109 (44) ◽  
pp. 20854-20857 ◽  
Author(s):  
Wenfang Sun ◽  
Qiu Dai ◽  
James G. Worden ◽  
Qun Huo
Keyword(s):  
Gold Nanoparticle ◽  
Hybrid Material ◽  
Optical Limiting ◽  
Covalently Bonded

Wave propagation improvement in two-dimensional bond-based peridynamics model

2021 ◽  
pp. 095440622098555
Author(s):  
Reza Alebrahim ◽  
Pawel Packo ◽  
Mirco Zaccariotto ◽  
Ugo Galvanetto
Keyword(s):  
Wave Propagation ◽  
Dynamic Performance ◽  
Numerical Dispersion ◽  
Motion Modeling ◽  
Minimization Method ◽  
Irregular Wave ◽  
Point Collocation ◽  
Potential Applications ◽  
Non Local ◽  
Set Up

In this study, methods to mitigate anomalous wave propagation in 2-D Bond-Based Peridynamics (PD) are presented. Similarly to what happens in classical non-local models, an irregular wave transmission phenomenon occurs at high frequencies. This feature of the dynamic performance of PD, limits its potential applications. A minimization method based on the weighted residual point collocation is introduced to substantially extend the frequency range of wave motion modeling. The optimization problem, developed through inverse analysis, is set up by comparing exact and numerical dispersion curves and minimizing the error in the frequency-wavenumber domain. A significant improvement in the wave propagation simulation using Bond-Based PD is observed.

The Reduction of Bias Error in Transfer Function Estimates Using FFT-Based Analyzers

1984 ◽  
Vol 106 (1) ◽  
pp. 29-35 ◽  
Author(s):  
P. Cawley
Keyword(s):  
Transfer Function ◽  
Random Excitation ◽  
Analogue Computer ◽  
Bias Error ◽  
Testing Time ◽  
Theoretical Predictions ◽  
Set Up ◽  
Modal Mass ◽  
Time Required ◽  
Good Agreement

The susceptibility to bias error of two methods for computing transfer (frequency response) functions from spectra produced by FFT-based analyzers using random excitation has been investigated. Results from tests with an FFT analyzer on a single degree-of-freedom system set up on an analogue computer show good agreement with the theoretical predictions. It has been shown that, around resonance, the bias error in the transfer function estimate H2 (Syy/Sxy*) is considerably less than that in the more commonly used estimate, H1 (Sxy/Sxx). The record length, and hence the testing time, required for a given accuracy is reduced by over 50 percent if the H2 calculation procedure is used. The analysis has also shown that if shaker excitation is used on lightly damped structures with low modal mass, it is important to minimize the mass of the force gage and the moving element of the shaker.

Simulating the behaviour of folded cartons during complex packing operations

2006 ◽  
Vol 220 (12) ◽  
pp. 1797-1811 ◽  
Author(s):  
D M Sirkett ◽  
B J Hicks ◽  
C Berry ◽  
G Mullineux ◽  
A J Medland
Keyword(s):  
End Users ◽  
Fundamental Issue ◽  
Trial And Error ◽  
Machine Material ◽  
Packaging Machine ◽  
Set Up ◽  
Fine Tune ◽  
Responsiveness To Change ◽  
Lower Production ◽  
Good Agreement

The folding carton is a widely used packaging solution. Recent European Union packaging legislation has forced carton manufacturers to use lighter-weight grades of carton board. This typically results in a reduction in board stiffness, which can lead to decreased process efficacy or even prevent successful processing. In order to overcome this, end-users lower production rates and fine-tune packaging machine settings for each pack and material. This trial-and-error approach is necessary because the rules relating machine set-up to pack design and material properties are not generally well known. The present study addresses this fundamental issue through the creation of a finite-element computer simulation of carton processing. Mechanical testing was performed to ascertain the key mechanical properties of the carton walls and creases. The carton model was validated against the experimental results and was then subjected to the machine-material interactions that take place during complex packaging operations. The overall approach was validated and the simulation showed good agreement with the physical system. The results of the simulation can be used to determine guidelines relating machine set-up criteria to carton properties. This will improve responsiveness to change and will ultimately allow end-users to process thinner lighter-weight materials more effectively.

Nonlinear optical properties of colloidal carbon nanoparticles: nanodiamonds and carbon dots

RSC Advances ◽  
2014 ◽  
Vol 4 (76) ◽  
pp. 40152-40160 ◽  
Author(s):  
Irene Papagiannouli ◽  
Athanasios B. Bourlinos ◽  
Aristides Bakandritsos ◽  
Stelios Couris
Keyword(s):  
Optical Properties ◽  
Carbon Dots ◽  
Carbon Nanoparticles ◽  
Nonlinear Optical ◽  
Laser Excitation ◽  
Optical Limiting ◽  
Nonlinear Optical Properties ◽  
Nlo Response ◽  
Colloidal Carbon ◽  
532 Nm

Nanodiamonds (NDs) and carbon-dots (CDs) suspensions exhibit significant NLO response under both ps and ns laser excitation. NDs exhibit important optical limiting action under nanosecond visible (532 nm) and infrared (1064 nm) laser excitation.

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