Measurement of nonlinear refractive index of Ag and Au nano-particles using moiré technique

Ara, M.H. Majles; Javadi, Z.; Sirohi, R. S.

doi:10.1016/j.ijleo.2010.11.025

Cited by 11 publications

(3 citation statements)

References 19 publications

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“…After the pump illumination, its optical-field-induced refractive index changes in the nonlinear sample. The role of the electronic and thermal mechanisms in the process of refraction index changes in the interaction of intense laser light with matter has been studied in many papers [20][21][22]. Because the phase distribution of the distorted wavefront is actually the phase projection, the interfering fields can be written as…”

Section: Theorymentioning

confidence: 99%

Nonlinear refractive index measuring using a double-grating interferometer in pump–probe configuration and Fourier transform analysis

Rasouli

Ghorbani

2012

J. Opt.

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In this paper, we have presented a simple, stable, highly sensitive and timesaving method based on a double-grating interferometer in conjunction with a pump–probe technique for measuring the nonlinear refractive index. A pump laser beam is aligned collinearly with an expanded plane parallel probe beam by a dichroic mirror. These beams pass through the sample, while right behind the sample using a suitable bandpass filter the pump beam is intercepted. The distorted probe beam then passes through a double-grating interferometer. One of the lateral shearing interference patterns is recorded by use of a CCD camera and, after digitization, has been stored in a computer. The interference pattern is analyzed by means of a Fourier transform algorithm. The refractive index changes have been obtained from phase distribution of the recorded fringe patterns. The implementation of the technique is straightforward and the arrangement is very simple and stable yet its sensitivity is comparable with other interferometry methods. It is also not a time consuming method. The method is applied for measuring the thermal nonlinear refractive index n2 of colloidal gold nanoparticles in water solution.

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Section: Theorymentioning

confidence: 99%

Nonlinear refractive index measuring using a double-grating interferometer in pump–probe configuration and Fourier transform analysis

Rasouli

Ghorbani

2012

J. Opt.

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“…The Moiré technique (MT) has been used in a variety of areas, as for example, to evaluate the soil surface [35], to decode information hiding scheme for visual cryptography [36], to digitalize the human body [37], to the measurement of nonlinear optical properties of noble metal nanoparticles [38] and to analyze biological surface profiles and shapes without contact [39].…”

Section: Introductionmentioning

confidence: 99%

Determination of the wear resistance of 1020 steel superficially treated in contact with 3104 aluminum alloy using the microwear test compared to the designed wear test evaluated by the moiré optical technique

Soares,

Manfrinato,

Gazzola

et al. 2024

Matéria (Rio J.)

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The AA 3104 aluminum alloy is widely used as packaging for food storage. However, the package fabrication causes wear to the cutting knife and stamping tools. The objective of this work was to evaluate the wear resistance of the 1020 steel applied in tools for molding and cutting operations of AA 3104, with and without surface treatment, comparing two techniques of wear tests. The samples of 1020 steel were treated by plasma nitriding and DLC film deposition. All samples were tested by a microwear test by fixed ball (MWT). Also, a prototype of the tools machine was developed to simulate the wear between 1020 steel against AA 3104 that occurs in service, whose wear result was analyzed by the moiré optical technique by phase-shifting (DWT). It was observed that the treated samples increased the wear resistance compared to the base material (BM), indicating an increase in the cutting tool lifetime. The DLC film treatment presented greater wear resistance than the nitriding treatment. The microwear test presented the wear volume behavior similar to the behavior of the prototype of wear test, showing that the MWT can be used to study the wear phenomenon with good relationship with the practice, the DWT can indicate the wear behavior of the material in service and the moiré technique can be efficiently used to determine a wear behavior in the designed wear test.

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“…Because silver nanoparticles (AgNPs) exhibit a high surface plasmon resonance (SPR) in visible light, they have recently received much attention in various photonic devices [ 14 ]. SPR can lead to increased electric fields in a localized region, altering the optical characteristics that could be beneficial in various applications such as optical limiting, electronics, and optical signal processing [ 15 , 16 ]. Among various optical characteristics, nonlinear absorption is considered the most important because it can alter strong light propagation in the medium and lead to various applications [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Excitation Wavelength and Colloids Concentration-Dependent Nonlinear Optical Properties of Silver Nanoparticles Synthesized by Laser Ablation

et al. 2022

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We reported experimental results from investigations that employed the Z-scan method to explore the dependence of silver nanoparticles’ (AgNPs) nonlinear optical properties on the excitation wavelength, AgNP concentration, and size. Using a 532 nm Nd: YAG laser beam at 100 mJ/pulse for different ablation times, AgNPs were synthesized from a silver target immersed in distilled water. UV–Vis spectroscopy and an atomic absorption spectrometer are used to characterize the optical properties of laser-synthesized AgNPs as well as their concentrations. The AgNPs’ size and shape are determined using a transmission electron microscope (TEM). The laser-synthesized AgNPs are spherical, with an average particle size of 12 to 13.2 nm. Whatever the ablation time, the AgNP colloids exhibit reversed saturable absorption and a negative nonlinear refractive index (n2). Both n2 and the nonlinear absorption coefficient (α3) increase as the AgNP concentration increases. As the excitation wavelength and average size of the AgNPs increase, n2 and α3 decrease.

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Measurement of nonlinear refractive index of Ag and Au nano-particles using moiré technique

Cited by 11 publications

References 19 publications

Nonlinear refractive index measuring using a double-grating interferometer in pump–probe configuration and Fourier transform analysis

Nonlinear refractive index measuring using a double-grating interferometer in pump–probe configuration and Fourier transform analysis

Determination of the wear resistance of 1020 steel superficially treated in contact with 3104 aluminum alloy using the microwear test compared to the designed wear test evaluated by the moiré optical technique

Excitation Wavelength and Colloids Concentration-Dependent Nonlinear Optical Properties of Silver Nanoparticles Synthesized by Laser Ablation

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