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Showing 1 to 20 of 25 for “"z scan"”.
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Measuring Nonlinear Properties of Graphene Thin Films Using Z-Scan Technique
… measuring the nonlinear parameters, and the Z-scan method has been considered the standard approach due to its simplicity and sensitivity. The main goal of this research was to investigate the thermal nonlinearities of nonfunctionlaized and functionalized graphene thin films without and with …
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Experimental Techniques For Nonlinear Material Characterization: A Nonlinear Spectrometer Using A White-light Continuum Z-scan
… like, white-light continuum pump-probe and Z-scan techniques were used to measure the peak 2PA cross-sections for a number of commercially available photoinitiators. In the new method mentioned above, a high energy, broadband femtosecond white-light continuum is used to replace the single …
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Quantitative Fluorescence Studies in Living Cells: Extending Fluorescence Fluctuation Spectroscopy to Peripheral Membrane Proteins
… membrane. We developed a new method based on z-scan FFS that accounts for the fluorescence contributions from cytoplasmic and membrane layers by incorporating a fluorescence intensity z-scan through the cell. H-Ras-EGFP served as a model system to demonstrate the feasibility of the technique. …
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Propriétés optiques linéaires et non linéaires des couches minces de carbone déposées par ablation laser
… de la couche mince. La méthode du Z-scan est souvent utilisée afin de mesurer des coefficients optiques non linéaires d'un matériau. Une problématique qui provient de la méthode du Z-scan est le cas où nous utilisons des couches minces trop fragiles et leur structure change de …
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Não-linearidade óptica de terceira ordem de líquidos orgânicos e colóides com nanobastões de ouro
… estes fenômenos. Dentre elas, a técnica Z-scan é a mais utilizada para deter- minar o índice de refração NL (n2) e coeficiente de absorção NL (α2) de terceira ordem em materiais centrossimétricos. Neste trabalho, buscamos estudar a resposta óptica NL de na- nocompósitos plasmônicos (NCPs), …
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Nonlinear optical properties of novel nanostructured ion implanted laser ablated silicon using femtosecond pulse excitation
… properties of the samples was studied by the Z-scan techniques using ~ 100 fs pulses. The Z-scan technique is a relatively simple and direct measurement of both the real and imaginary part of [chi]^{(3)}, where the nonlinear refractive index (n _2) is related to [chi]^{(3)}_{Re} and the …
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Commutation optique dans un cristal photonique à base de silicium
… autour de I.Spm. À l'aide de la technique du Z-scan, les mesures des coefficients de Kerr et d’absorption de deux photons sont effectuées dans l’échantillon. Les résultats démontrent la présence des effets non-linéaires attendus. Les mesures de la transmission de l'échantillon en fonction de la …
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Chemistry of Carbon Sulfides
… metal complexes, were measured using the z-scan technique with a 35 ps pulsed laser at 527.5 nm. The measurements were done in solution, which was continuously pumped through the sample cuvette to avoid heating. The susceptibilities of the molecules in solution was determined by subtracting …
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The synergistic role of light and heat in liquid-based nanoparticle manipulation
… the nature of the effect, a new time-resolved z-scan technique was developed to measure the timescale and magnitude of the refractive index change. Surprisingly, the data demonstrates that the timescales can only be explained by thermal-absorption, -diffusion, and thermo-optic effects. As a …
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Synthesis and characterization of ruthenium complexes with (N-N)(P-P) and (N-P)2 donor sets
… scattering (HRS) and frequency-depentdent Z-scan techniques, respectively. The first hyperpolarizabilities of the ruthenium halide and mono-alkynyl complexes described in Chapter 2 were determined by HRS measurements. The second hyperpolarizabilities of some organometallic complexes …
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Synthesis and characterization of ruthenium complexes with (N-N)(P-P) and (N-P)2 donor sets
… scattering (HRS) and frequency-depentdent Z-scan techniques, respectively. The first hyperpolarizabilities of the ruthenium halide and mono-alkynyl complexes described in Chapter 2 were determined by HRS measurements. The second hyperpolarizabilities of some organometallic complexes …
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Časově rozlišená laserová spektroskopie nanomateriálů
… of theory and experimental setup of the z-scan method, which can be used to measure the nonlinear refractive index and the two-photon absorption coefficient. In theoretical part we describe the influence the quality of laser beam, quality and thickness of the sample on measurements. There …
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Hyper-Rayleigh scattering measurements of hyperpolarizabilities for tetrahedral molecules
… are inadequate in nonlinear optics. Through z-scan measurements, thermal lensing and/or absorption coefficients have been obtained for six molecules.
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White Light Continuum for Broadband Nonlinear Spectroscopy
… for nonlinear measurement methods such as the Z-scan technique. Using a broadband WLC instead of conventional tunable sources of radiation such as optical parametric generators/amplifiers has been shown to increase the efficiency of such measurements by nearly an order of magnitude. Although WLC …
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Triphenylmethylium-Based Multitopic Two-Photon Absorbers: Synthesis and Characterization
… absorbers, which was established thanks to Z-scan measurements. Organometallic compounds bearing electron-releasing groups such as «Fe(η5-C5Me5)(κ2-dppe)C≡C−» , « Ru(Cl)(κ2-dppe) 2C≡C− » or ethynylferrocene were then synthesized and fully characterized. These organometallic dyes should possess …
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Triphenylmethylium-Based Multitopic Two-Photon Absorbers: Synthesis and Characterization
… absorbers, which was established thanks to Z-scan measurements. Organometallic compounds bearing electron-releasing groups such as «Fe(η5-C5Me5)(κ2-dppe)C≡C−» , « Ru(Cl)(κ2-dppe) 2C≡C− » or ethynylferrocene were then synthesized and fully characterized. These organometallic dyes should possess …
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Optical properties and thermal conductivity of resistive Au nanogranular films
… neuromorphic application were measured using Z-scan and optical Kerr effect (OKE) techniques. The effect of switch activation is reflected as microscopical structural changes in the nanogranular Au films as revealed by a high entropy value of the scanning electron microscopy images and by the …
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EXPERIMENTAL AND COMPUTATIONAL STUDIES OF NONLINEAR QUENCHING IN MATERIALS USED AS RADIATION DETECTORS
… of radiation detectors used in security scanning, medical imaging, and high energy physics applications depend on understanding the physical mechanisms that limit intrinsic energy resolution. Nonproportionality between electron energy response and the initial energy of a stopping electron …
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Molecular Structure-nonlinear Optical Property Relationships For A Series Of Polymethine And Squaraine Molecules
… nonlinear spectroscopic techniques (Z-scan, two-photon fluorescence and white-light continuum pump-probe spectroscopy) to obtain the 2PA spectra revealing 2PA bands, and we confirm the experimental data by comparing the results from the different methods mentioned. By systematically …
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Evaluating optical nonlinearities and applications of photonic nanomaterials
… NaNbO3 nanocrystals, using the techniques of Z-Scan, and Hyper-Rayleigh Scattering (HRS) and a random laser application was performed. Interesting properties have been found in TMD’s. A high value for the first hyperpolarizability of ZrTe2 monolayers suspended in acetonitrile (ACN) was measured …
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