نتایج جستجو برای: z scan
تعداد نتایج: 228868 فیلتر نتایج به سال:
A novel porphyrin derivative bearing one D-π-A-π-D pyrimidine chromophore at the periphery was designed, prepared, and studied using the Z-scan technique, the results showing that this compound exhibits enhanced nonlinear optical (NLO) absorption, refraction and optical limiting responses. The significant NLO properties can be ascribed to an effective combination of distinct nonlinear mechanisms.
Application of a parallel-projection inversion technique to z-scan spectra of multiply charged xenon and krypton ions, obtained by non-resonant field ionization of neutral targets, has for the first time permitted the direct observation of intensity-dependent ionization probabilities. These ionization efficiency curves have highlighted the presence of structure in the tunnelling regime, previou...
The concentration dependence of energy transfer upconversion in Nd:YAG is investigated via the z-scan technique. The ETU coefficient is determined to increase from 35×10 -18 cm 3 /s to 90×10 -18 cm 3 /s when the concentration increases from 0.3 at.% to 1.1 at.%. OCIS codes: (190.7220) Upconversion; (140.3530) Lasers, neodymium; (300.6460) Spectroscopy, saturation.
We present a high-speed atomic force microscope that exhibits a number of practical advantages over previous designs. Its central component is a high-speed scanner with a maximum scan size of 23 microm x 23 microm and a conveniently large sample stage area (6.5 mm x 6.5 mm). In combination with small cantilevers, image rates of up to 46 images s(-1) in air and 13 images s(-1) in liquid are reac...
A first approach toward understanding the targeted design of molecular photoacoustic contrast agents (MPACs) is presented. Optical and photoacoustic Z-scan spectroscopy was used to identify how nonlinear (excited-state) absorption contributes to enhancing the photoacoustic emission of the curcuminBF2 and bis-styryl (MeOPh)2BODIPY dyes relative to Cy3.
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