Nonlinear optical properties of Au nanoparticles colloidal system: Local and nonlocal responses

Souza, Rui Fragassi; Alencar, Márcio A. R. C.; Silva, Eid C. da; Meneghetti, Mário R.; Hickmann, Jandir M.

doi:10.1063/1.2929385

Cited by 54 publications

(38 citation statements)

References 24 publications

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“…By changing laser fluenece, laser wavelength, laser repetition rate, and focal length of focusing lens, one may control the morphology, size and concentration of nanoparticles (Jeon and Yeh 1998;Prochazka et al 1997;Haider et al 2011). The present study of isolated particles allows the directed observation of ultrafast coherent nonlineaties associated with the plasmon as well as incoherent heating effects (Pelton et al 2005;Sudheesh and Chandrasekharan 2012;Souza et al 2008). Therefore, the laser ablated suspended metal nanoparticles prepared in liquid phase can be used for optical limiting (OL) devises.…”

Section: Introductionmentioning

confidence: 92%

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Thermo optical properties of Ag nanoparticles produced by pulsed laser ablation

2015

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The linear and nonlinear optical properties of silver nanoparticles have been investigated experimentally. Colloidal nanoparticle samples were synthesized by laser ablation at various fluences. The samples were characterized by linear absorption spectroscopy, transmission electron microscopy and dynamic light scattering methods. The behavior of nonlinear refractive index of nanoparticles was studied using the close and open Z-scan techniques by low power CW laser beam. Observation of asymmetrical configurations of the Z-scan curve indicates that nonlinear refraction occurring in the Ag samples is related to the thermo optical process. In addition, the observed optical limiting behavior is due to nonlinear refraction of samples arising from thermal lens formation under low power CW excitation. The optimum position for samples as the optical limiter based on self-defocusing effect is the valley point. When the illumination laser power is low, the self-defocusing effect is mainly dominated. Actually laser fluence variation during the ablation procedure leads to concentration variation of nanoparticles in suspensions which in turn affect the optical properties of samples. The dependence of the nonlinear properties on morphological parameters, metal concentration, and particle size have been explained by experimental results.

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Section: Introductionmentioning

confidence: 92%

“…These NLO properties of a colloid can be mainly attributed to two different origins: local field effect and large metals nonlinear response (Souza et al 2008). In this step, the Thermo optical properties of Ag nanoparticles produced… NLO refractive index of samples can be obtained by using the single beam Z-scan method.…”

Section: Z-scan Experimentsmentioning

confidence: 99%

Thermo optical properties of Ag nanoparticles produced by pulsed laser ablation

2015

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“…Moreover, this vegetable oil presents negligible third-order nonlinear optical responses at near infrared region. 14,35 Hence, the colloid nonlinear refractive index and absorption coefficient depend mainly on the third-order nonlinear susceptibility of the metallic particles. The oil was degassed for approximately 3h at 298 K under vacuum prior to being introduced into the sputtering machine (MED 020, Bal-Tech).…”

Section: Methodsmentioning

confidence: 99%

“…(5) and (6), several authors obtained the third-order nonlinear susceptibilities of nanoparticles produced by different methods. 14,[19][20][21][22][23][24][25][26] Nevertheless, the use of this procedure to characterize particles produced by wet chemistry methods can lead to inaccurate results. In fact, the nanoparticles' production based on chemical reactions intrinsically results in colloidal systems containing byproducts, stabilizing agents, and remaining substrates.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15] Owing to this fact, different proposals have been made in order to exploit this effect for the development of different optical and photonic applications, such as surface enhanced Raman spectroscopy (SERS), 4 optical limiters, [4][5][6] and optical switching devices. 5,6 In particular, aiming ultrafast all-optical switching applications, it is necessary to develop a suitable colloid, combining the liquid host and metallic particles' absorptive and refractive responses.…”

Section: Introductionmentioning

confidence: 99%

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Third-order nonlinear optical response of colloidal gold nanoparticles prepared by sputtering deposition

Castro

Wender

Alencar

et al. 2013

Journal of Applied Physics

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The nonlinear optical responses of gold nanoparticles dispersed in castor oil produced by sputtering deposition were investigated, using the thermally managed Z-scan technique. Particles with spherical shape and 2.6 nm of average diameter were obtained and characterized by transmission electron microscopy and small angle X-ray scattering. This colloid was highly stable, without the presence of chemical impurities, neither stabilizers. It was observed that this system presents a large refractive third-order nonlinear response and a negligible nonlinear absorption. Moreover, the evaluation of the all-optical switching figures of merit demonstrated that the colloidal nanoparticles prepared by sputtering deposition have a good potential for the development of ultrafast photonic devices.

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Tuning the Refractive Index of Homopolymer Blends by Controlling Nanoscale Domain Size via RIR‐MAPLE Deposition

McCormick

Cline²,

Chadha

et al. 2013

Macro Chemistry & Physics

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Anti‐reflection (AR) coatings designed for glass and other rigid, inorganic substrates are commercially available; however, these inorganic AR coatings tend to crack or delaminate on flexible substrates. A polymeric film with a gradient refractive index (GRIN) profile would make an ideal AR coating for flexible substrates, but such coatings are challenging to fabricate using traditional, solution‐based techniques. Emulsion‐based resonant infrared, matrix‐assisted pulsed laser evaporation (RIR‐MAPLE) offers a straightforward approach to enabling the desired GRIN profile in polymeric materials. Two homopolymers (polystyrene (PS) and poly(methyl methacrylate) (PMMA)) are deposited as a blend and one component (PMMA) is dissolved, leaving behind a porous PS film. The porosity and refractive index (RI) are controlled by the volume ratio of the two homopolymers in the film. Structural and optical characterizations, as well as comparison to modeled optical properties, confirm that porous films fabricated from polymer blends deposited by RIR‐MAPLE behave as effective media over most of the visible spectrum. While evidence for the partial collapse of the porous polymer networks is observed, the RI of the porous films is reduced from that of the bulk material. Importantly, these studies demonstrate that RIR‐MAPLE should enable broadband, omnidirectional, polymeric AR coatings appropriate for flexible substrates.

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Nonlinear optical properties of Au nanoparticles colloidal system: Local and nonlocal responses

Cited by 54 publications

References 24 publications

Thermo optical properties of Ag nanoparticles produced by pulsed laser ablation

Thermo optical properties of Ag nanoparticles produced by pulsed laser ablation

Third-order nonlinear optical response of colloidal gold nanoparticles prepared by sputtering deposition

Tuning the Refractive Index of Homopolymer Blends by Controlling Nanoscale Domain Size via RIR‐MAPLE Deposition

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