Effect of silver nanoparticles on fluorescence and nonlinear properties of naturally occurring betacyanin dye

Silver Nanoparticles Functionalized by Fluorescein Isothiocyanate or Rhodamine B Isothiocyanate: Fluorescent and Plasmonic Materials

“…The interaction of fluorophores with Au and Ag NPs is slightly more complicated, and both enhancement and quenching of fluorophores have been reported [29][30][31][32][33]. Part of the reason for this apparent contradiction is that the interaction between fluorophores and the NP depends on the size and shape of the NPs, the distance of the fluorophore from the surface of the NPs, the orientation of the fluorophore dipole moment, and the overlap between the emission spectrum of the fluorophore and the plasmon resonance spectral feature of the NP [34][35][36].…”

Linear and nonlinear optical absorption characterization of natural laccaic acid dye

“…From the absorption spectroscopy analysis, it was found that the linear properties are concentration and thickness dependent. Nonlinear optical parameters β 2 , Im[χ (3) ] and γ calculated through the openaperture (OA) Z-scan technique were of 10 −10 , 10 −11 and 10 −32 order, respectively. The achieved values of γ in the solutions were of 10-1 order of magnitude compared to that of anionic 3-dicyanomethylen-5,5-dimethyle-1-[2-(4-hydroxyphenyl)ethenyl)]-cyclohexene (1) in Ref.…”

“…6. The NLA coefficient (β 2 ), the imaginary part of the third-order susceptibility (Im[χ (3) ]) and the second-order hyperpolarizability (γ) were evaluated, which the numerical are summarized in Table 1. Based on the fitting model [39][40][41], 2PA is found to be more consistent.…”

“…Organic materials [1], including natural dyes [1][2][3] with large NLO responses, are of major interest for their potential applications in optical signal-processing devices, upconversion lasers [4], optical limiting for photo-sensors and human eyes protection from intense laser irradiation [5][6][7][8]. Additionally, materials with NLO properties such as broadband spectral response and fast response time are of great importance for realizing optical data storage [9,10], two-photon microscopy [11] and three-dimensional optical storage micro-fabrication [12].…”

“…refractive index (n) and extinction coefficient (k), were carried out in a comprehensive way through absorbance, fluorescence and ellipsometric studies. The nonlinear optical parameters such as nonlinear absorption coefficient β eff (or β 2 ), the imaginary third-order susceptibility (Im[χ (3) ]) and the imaginary part of second-order hyperpolarizability (γ) of the samples were evaluated using the open-aperture Z-scan technique with a laser pulse duration of 10 ns at 532 nm wavelength. The corresponding numerical values of these parameters were of 10 −10 , 10 −11 and 10 −32 order, respectively.…”