<i>In situ</i> synthesis and nonlinear optical properties of Au:Ag nanocomposite polymer films

Karthikeyan, B.; Anija, M.; Philip, Reji

doi:10.1063/1.2168667

Cited by 98 publications

(51 citation statements)

References 9 publications

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“…The experimental data fits well to the corresponding nonlinear transmission equation, given by The non linear absorption coefficient is higher in the coreshell nanoparticles as compared to uncoated nanoparticles, in confirmation with a previous report [15]. The three photon absorption data fitted well with the experimental curves, indicating that three-photon absorption is the basic mechanism of optical limiting.…”

Section: Optical Limiting Studiessupporting

confidence: 76%

Optical Limiting Characteristics of Core-Shell Nanoparticles

Vinitha

Manirahulan

Ramalingam

2010

J. Nonlinear Optic. Phys. Mat.

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Abstract-TiO 2 nanoparticles were synthesized by hydrothermal method at 180˚C from TiOSO 4 aqueous solution with1m/l concentration. The obtained products were coated with silica by means of a seeded polymerization technique for a coating time of 1440 minutes to obtain well defined TiO 2 @SiO 2 core-shell structure. The uncoated and coated nanoparticles were characterized by using X-Ray diffraction technique (XRD), Fourier Transform Infrared Spectroscopy (FT-IR) to study their physico-chemical properties.Evidence from XRD and FTIR results show that SiO2 is homogenously coated on the surface of titania particles. FTIR spectra show that there exists an interaction between TiO 2 and SiO 2 and results in the formation of Ti-O-Si chemical bonds at the interface of TiO 2 particles and SiO 2 coating layer. The non linear optical limiting properties of TiO2 and TiO 2 @SiO 2 nanoparticles dispersed in ethylene glycol were studied at 532nm using 5ns Nd:YAG laser pulses. Three-photon absorption is responsible for optical limiting characteristics in these nanoparticles and it is seen that the optical nonlinearity is enhanced in core-shell structures when compared with single counterparts. This effective three-photon type absorption at this wavelength, is of potential application in fabricating optical limiting devices.

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Section: Optical Limiting Studiessupporting

confidence: 76%

Optical Limiting Characteristics of Core-Shell Nanoparticles

Vinitha

Manirahulan

Ramalingam

2010

J. Nonlinear Optic. Phys. Mat.

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“…The nonlinear absorption coefficient increases substantially in the nanocomposites, as compared to pure ZnO and Ag colloids. It is reported that the nonlinear absorption coefficient increases in the bimetallic and core-shell nanocomposites, as compared to pure metals [23].…”

Section: Resultsmentioning

confidence: 99%

Spectral and nonlinear optical characteristics of nanocomposites of ZnO–Ag

Irimpan

Nampoori

Radhakrishnan

2008

Chemical Physics Letters

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a b s t r a c tIn this Letter we present the spectral and nonlinear optical properties of ZnO-Ag nanocomposites prepared by colloidal chemical synthesis. Obvious enhancement of ultraviolet (UV) emission of the samples is observed and the strongest UV emission is over three times than that of pure ZnO. These nanocomposites show self-defocusing nonlinearity and good nonlinear absorption behaviour which increases with increasing Ag volume fraction. The observed nonlinear absorption is explained through two photon absorption followed by free carrier absorption. ZnO-Ag is a potential nanocomposite material for the UV light emission and for the development of nonlinear optical devices with a relatively small limiting threshold.

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“…The switch over from saturable absorption to reverse saturable absorption is an interesting effect that can be utilized for optical switching, optical pulse compression and laser pulse narrowing. The change over in sign of the non-linearity is related to the interplay of exciton band bleach and optical limiting mechanisms [100].In semiconductors, RSA results mainly due to the nonlinear mechanisms such as two-photon absorption (TPA), free-carrier absorption (FCA), nonlinear scattering or a combination of these processes [95,101]. In semiconductors, two-photon absorption is allowedwhen the incident light source energy is less than the direct band gap energy Eg, but greater than Eg/2.…”

Section: +mentioning

confidence: 99%

“…In the present case the nonlinear absorption coefficient α(I) can be expressed by the following relation [99] …”

Section: +mentioning

confidence: 99%