Thermal-lens model compared with the Sheik-Bahae formalism in interpreting Z-scan experiments on lyotropic liquid crystals

Cuppo, Fábio Luiz Sant'Anna; Neto, A. M. Figueiredo; Gómez, Sergio L.; Palffy‐Muhoray, Peter

doi:10.1364/josab.19.001342

Cited by 214 publications

(85 citation statements)

References 22 publications

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“…Thus the nonlinear refraction behaviour of Au-PVA nanofluid was affected by the sample synthesizing technique. Since the effective thermal nonlinearity of the medium can be written as [20] n th…”

Section: Methodsmentioning

confidence: 99%

Effect of particle size on nonlinear refractive index of Au nanoparticle in PVA solution

Shahriari¹,

Yunus²,

Saion³

2010

Braz. J. Phys.

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Nonlinear refractive index of Au nanoparticle suspended in PVA solution was measured using a single beam Z-scan technique. Measurements were carried out using a green CW laser beam operated at 532 nm as excitation source. Five nanoparticle samples with different particle sizes were prepared by γ radiation method. The Au nano-fluid shows a good third order nonlinear response for particle sizes ranging from 7.0 nm to 18.7 nm. The sign of the nonlinear refractive index was found to be negative and the magnitude was in the order of 10 −8 cm 2 /W. The results show that the nonlinear effect tends to be increased linearly with the increasing of particle sizes thus could be a good candidate for nonlinear optical devices.

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Section: Methodsmentioning

confidence: 99%

Effect of particle size on nonlinear refractive index of Au nanoparticle in PVA solution

Shahriari¹,

Yunus²,

Saion³

2010

Braz. J. Phys.

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“…The localized absorption of the laser beam propagating through an absorbing solution medium produces a spatial distribution of the temperature in sample solution and, consequently, a spatial variation of the refractive index that acts as a thermal lens results in the phase distortion of the propagating beam [25,33,34]. The thermal effect has been discussed by Sheik-Bahae et al [15,16,35] in terms of temperature derivative of the index of refraction ( dn/ dT ) of the medium.…”

Section: Nonlinear Measurementsmentioning

confidence: 99%

“…To determine the sign and magnitude of nonlinear refractive index n 2 of the studied sample, the normalized transmittance of closed aperture is given by [16,[35][36][37]:…”

Section: Nonlinear Measurementsmentioning

confidence: 99%

Optical Nonlinearity Investigation of the Novel Organic-Inorganic Hybrid Salt: 1,1'-methylenedipyridinium pentacynidonitrosoferrate(II)pentahydrate Using Z-Scan System

2016

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The organic-inorganic hybrid salt: 1, 1 -methylenedipyridinium pentacynidonitrosoferrate(II)pentahydrate is synthesized and characterized by multinuclear NMR, IR, and UV-vis spectroscopies and elemental analysis. The third order nonlinear optical properties of the new complex in an aqueous solution have been studied using Z-scan technique. Measurements were performed for input intensities (I0) of 437 and 241 W/cm 2 for the two concentrations with a CW diode laser at 635 nm wavelength. The nonlinear optical absorption coefficient (β) and nonlinear refraction (n2) are found at 1.28 × 10 −3 cm/W and 10.17 × 10 −9 cm 2 /W, respectively. The overall results suggested that better nonlinearity was observed at a higher concentration of sample. Our results suggest that this material is considered as a promising candidate for future optical device applications.

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“…A transmitância normalizada é calculada, em cada ponto z, e instante t, através da equação 2.7 (CUPPO et al, 2002):…”

Section: Modelo De Lente Térmicaunclassified

“…Nesse caso, observa-se que a curva é antisimétrica em relação ao ponto z = 0 e T N = 1, não apresentando distorções. Além disso, o pico da transmitância normalizada não ultrapassa o valor de 1,2, condição para que o modelo teórico de lente térmica se ajuste bem aos dados experimentais (CUPPO et al, 2002). Já os pontos representados por quadrados vermelhos são da medida realizada a uma potência demasiadamente alta para essa amostra: P = 116 mW.…”

Section: Transmitância Normalizadaunclassified

Efeito de lente térmica e não-linearidades ópticas do silício amorfo hidrogenado dopado com fósforo.

Espinosa¹

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Thermal-lens model compared with the Sheik-Bahae formalism in interpreting Z-scan experiments on lyotropic liquid crystals

Cited by 214 publications

References 22 publications

Effect of particle size on nonlinear refractive index of Au nanoparticle in PVA solution

Effect of particle size on nonlinear refractive index of Au nanoparticle in PVA solution

Optical Nonlinearity Investigation of the Novel Organic-Inorganic Hybrid Salt: 1,1'-methylenedipyridinium pentacynidonitrosoferrate(II)pentahydrate Using Z-Scan System

Efeito de lente térmica e não-linearidades ópticas do silício amorfo hidrogenado dopado com fósforo.

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