High-sensitivity, single-beam n_2 measurements

Sheik‐Bahae, Mansoor; Said, Ali A.; Stryland, Eric W. Van

doi:10.1364/ol.14.000955

Cited by 2,339 publications

(973 citation statements)

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“…The input beam was spatially filtered using a pin hole to obtain a pure Gaussian profile in the far field. Z-scan studies [32][33][34][35][36] were performed by focusing a 3-mm diameter input beam using a 200 mm focal length convex lens into the sample in both ps domain. The sample was placed on a high resolution linear translation stage and the detector (Si photodiode, SM1PD2A, Thorlabs) output was connected to a lock-in amplifier.…”

Section: Methodsmentioning

confidence: 99%

Magnetic and nonlinear optical properties of BaTiO3 nanoparticles

et al. 2015

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In our earlier studies the BaTiO3 samples were processed at higher temperatures like 1000oC and explained the observed magnetism in it. It is found that the charge transfer effects are playing crucial role in explaining the observed ferromagnetism in it. In the present work the samples were processed at lower temperatures like 650oC-800oC. The carrier densities in these particles were estimated to be ∼ 1019-1020/cm3 range. The band gap is in the range of 2.53eV to 3.2eV. It is observed that magnetization increased with band gap narrowing. The higher band gap narrowed particles exhibited increased magnetization with a higher carrier density of 1.23×1020/cm3 near to the Mott critical density. This hint the exchange interactions between the carriers play a dominant role in deciding the magnetic properties of these particles. The increase in charge carrier density in this undoped BaTiO3 is because of oxygen defects only. The oxygen vacancy will introduce electrons in the system and hence more charge carriers means more oxygen defects in the system and increases the exchange interactions between Ti3+, Ti4+, hence high magnetic moment. The coercivity is increased from 23 nm to 31 nm and then decreased again for higher particle size of 54 nm. These particles do not show photoluminescence property and hence it hints the absence of uniformly distributed distorted [TiO5]-[TiO6] clusters formation and charge transfer between them. Whereas these charge transfer effects are vital in explaining the observed magnetism in high temperature processed samples. Thus the variation of magnetic properties like magnetization, coercivity with band gap narrowing, particle size and charge carrier density reveals the super paramagnetic nature of BaTiO3 nanoparticles. The nonlinear optical coefficients extracted from Z-scan studies suggest that these are potential candidates for optical imaging and signal processing applications.

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Section: Methodsmentioning

confidence: 99%

Magnetic and nonlinear optical properties of BaTiO3 nanoparticles

et al. 2015

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“…In Figure 6, the sign of n 2 for all three samples is negative because the curves exhibited a valley after a peak. This situation demonstrates that all three samples act as selfdefocusing materials [34].…”

Section: Nlo Studiesmentioning

confidence: 74%

“…From this curve, the sign of nonlinear refractive index n 2 consequently self-focusing or defocusing the quiddity of the sample can be determined. The magnitude of n 2 can be calculated from the closed-aperture curve as well as the following equations [34]:…”

Section: Nlo Studiesmentioning

confidence: 99%

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Effect of temperature on the structural, linear, and nonlinear optical properties of MgO-doped graphene oxide nanocomposites

Kimiagar

Abrinaei

2017

Nanophotonics

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Magnesium oxide (MgO)-graphene oxide (GO) nanocomposites were prepared by the hydrothermal method at different temperatures. The effect of growth temperature on the structural, linear, and nonlinear optical (NLO) parameters was investigated. The decoration of MgO on GO sheets was confirmed by X-ray diffraction, scanning electron microscopy, Fourier transform infrared, and UV-visible (UV-vis) spectroscopy analyses. The energy band-gaps of MgO-GO nanocomposites were calculated from UV-vis spectrum using Tauc plot. The NLO parameters of MgO-GO nanocomposites were calculated for the first time by the simple Z-scan technique with nanosecond Nd:YAG laser at 532 nm. The nonlinear absorption coefficient β and nonlinear refractive index n 2 for MgO-GO nanocomposites at the laser intensity of 1.1 × 10 8 W/cm 2 were measured to be in the order of 10 −7 cm/W and 10 −12 cm 2 /W, respectively. The third-order NLO susceptibility of MgO-GO nanocomposites was measured in the order of 10 −9 esu. The results showed that MgO-GO structures have negative nonlinearity as well as good nonlinear two-photon absorption at 532 nm. Furthermore, the NLO parameters increased by the enhancement of the growth temperature. As the investigation of new materials plays an important role in the advancement of optoelectronics, MgO-GO nanocomposites possess potential applications in NLO devices.

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“…The optical limiting based on the nonlinear refractive index of the metal complexes of curcumin was investigated. The origin of the nonlinearity was investigated by comparison the Gaussian beam composition [12,13] and the thermal lens model [14]. …”

Section: Introductionmentioning

confidence: 99%