Resonant electronic nonlinearity and laser heating induced nonlinearity of chlorophosphonazo I

Effect of concentration and particle size on nonlinearity of Au nano-fluid prepared by γ (60Co) radiation

“…Many of the reported nonlinearity characterizations of nanoparticle in dielectric media were performed by the use of lasers with the wavelengths close to the absorption maximum of the surface plasmon resonance of nanoparticles [11][12][13][14][15][16]. For Au nanoparticles, when the aggregation of nanoparticles increases, it will broaden the absorption spectrum of plasmon and will give rise to a spectral feature at longer wavelengths [17]. The aim of this paper is to report the effect of solution concentration and nano-particle size on the nonlinearity properties of Au nano-fluid by using a single beam Z-scan technique.…”

Fluorescence upconversion properties of a chiral polybinaphthyl induced by two‐photon absorption

“…It has been used widely in material characterization 14. The nonlinear refraction in solid and liquid samples can be rapidly measured by using closed aperture (CA) Z‐scan measurements, which uses self‐focusing or self‐defocusing phenomena in optical nonlinear materials 17. In CA Z‐scan measurements, the transmittance of a tightly focused Gaussian beam through a finite aperture in the far field is measured by a detector, which is a function of the sample position z with respect to the focal plane.…”

Saturable absorption and two-photon absorption of 1,2,5-thiadiazolo[3,4-g]quinoxaline based derivatives with near-infrared fluorescence

“…There are two distinct nonlinear absorption processes: reverse saturable absorption and the saturable absorption (SA) [2][3][4]. Two-photon absorption (TPA) is one of the most important reverse saturable absorption behaviors, which has attracted growing interest over recent years due to the many applications in multiphoton microscopy, optical limiting, frequency-upconversion lasing, pulse stabilization and reshaping [1].…”