Optical Limiting Characteristics of Core-Shell Nanoparticles

Vinitha, G.; Manirahulan, K.; Ramalingam, A.

doi:10.1142/s0218863510005510

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…The thresholds of Cu 2 O and CuS were measured to be 1.78 and 0.51 J/cm 2 , respectively. 546 Silica-coated core−shell TiO 2 nanoparticles were synthesized by hydrothermal method 547 and evaluated for their OL performance using the open aperture Z-scan in both pulsed and CW modes at 532 nm. RSA was observed during the open aperture Z-scan using low power CW Nd:YAG laser and was more efficient in the core−shell nanoparticles when compared to individual nanoparticles.…”

Section: Metal Nanoparticlesmentioning

confidence: 99%

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

2016

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The control of luminous radiation has extremely important implications for modern and future technologies as well as in medicine. In this Review, we detail chemical structures and their relevant photophysical features for various groups of materials, including organic dyes such as metalloporphyrins and metallophthalocyanines (and derivatives), other common organic materials, mixed metal complexes and clusters, fullerenes, dendrimeric nanocomposites, polymeric materials (organic and/or inorganic), inorganic semiconductors, and other nanoscopic materials, utilized or potentially useful for the realization of devices able to filter in a smart way an external radiation. The concept of smart is referred to the characteristic of those materials that are capable to filter the radiation in a dynamic way without the need of an ancillary system for the activation of the required transmission change. In particular, this Review gives emphasis to the nonlinear optical properties of photoactive materials for the function of optical power limiting. All known mechanisms of optical limiting have been analyzed and discussed for the different types of materials.

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Section: Metal Nanoparticlesmentioning

confidence: 99%

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

2016

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“…Nonlinear absorption coefficient b was estimated from Open-aperture (OA) Z-scan data by using the following equation [20,21]. is the linear transmittance of the aperture with r 0 as the aperture radius, and w 0 indicating the beam radius at the aperture in the linear regime, and DF  is the on-axis phase shift at the focus (Z=0).…”

Section: Nonlinear Optical Studiesmentioning

confidence: 99%

Third order nonlinearity and optical power limiting studies of PS/ZnO nanocomposite foils for photonic applications

Barala

Maidur²,

Mohan

et al. 2022

Phys. Scr.

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The present work focuses on the preparation of Polystyrene (PS) and PS/ZnO nanocomposite foils by solution casting method and study their structural and nonlinear optical (NLO) characterizations. The Zinc Oxide (ZnO) nanoparticles were synthesized by Sol-gel method. Structural analysis of the prepared nanocomposite foils was carried out by X-ray diffraction (XRD) with an estimated average crystallite size of 27.33 nm. UV-Vis-NIR spectra reveal that the nanocomposite foils are transparent in the visible region. FESEM micrographs show the surface morphology of the prepared nanocomposite foils. Energy Dispersive X-Ray Spectroscopy (EDX) of the prepared foils confirmed the compositional and spatial distribution of the elements. The NLO properties such as nonlinear absorption coefficient (β), nonlinear index of refraction (n2), and third-order nonlinear susceptibility (χ⁽³⁾) were investigated by Z-scan technique at a wavelength of 532 nm and 200 mW with field intensity I_0=5.43 KW cm^(-2).The values of β were found to bein the order of ~ 10-7 cm/W, n2 in the order of ~10-12 cm2/W and χ⁽³⁾ in the range 4.99 x 10-7-38.7 x 10-7e.s.u. Further, the optical power limiting threshold was calculated to be 3.646 KW/cm2 for 8 wt % of PS/ZnO nanocomposite foil which is a better candidate to act as an optical limiter. The figure of merit has also been determined that establishes the suitability of nanocomposite foils for optical limiting and/or optical switching applications in the visible region.

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“…To determine the value of nonlinear absorption coefficient β, the following equation [34,35] was used:…”

Section: Open Aperture; Nonlinear Absorptionmentioning

confidence: 99%

Measurements of Nonlinear Optical Properties of PVDF/ZnO Using Z-Scan Technique

et al. 2015

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The nonlinear optical properties of ZnO nanoparticles dispersed in poly (vinylidene fluoride) (PVDF) polymer are investigated. PVDF/ZnO nanocomposites were prepared by mixing different concentrations of ZnO nanoparticles, as the filler, with PVDF, as the polymer matrix, using casting method. Acetone was used as a solvent for the polymer. FTIR spectra of the samples were analyzed thus confirming the formation of α and β phases. The absorbance spectra of the samples were obtained, thereby showing high absorption in the UV region. The linear absorption coefficient was calculated. The single-beam Z-scan technique was used to measure the nonlinear refractive index and the nonlinear absorption coefficient of the PVDF/ZnO nanocomposite samples. We observed that the nonlinear refractive index is in the order of 10 −13 cm 2 /W with the negative sign, whereas the nonlinear absorption coefficient is in the order of 10 −8 cm/W.

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Optical Limiting Characteristics of Core-Shell Nanoparticles

Cited by 9 publications

References 14 publications

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

Nonlinear Optical Materials for the Smart Filtering of Optical Radiation

Third order nonlinearity and optical power limiting studies of PS/ZnO nanocomposite foils for photonic applications

Measurements of Nonlinear Optical Properties of PVDF/ZnO Using Z-Scan Technique

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