3 research outputs found

    Magnetic Tuning of Optical Hysteresis Behavior in Lanthanide-Doped Nanoparticles

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    Magnetic-optical bifunctional materials have attracted tremendous interest due to their potential applications in biomedicine as well as multifunctional sensors. However, much attention has been paid on the bifunctional materials rendering magnetic and optical behavior individually, rather than the interaction between magnetic field and optical process. In this paper, we examine the coupling of magnetic field with photoluminescence in Eu<sup>3+</sup>-doped NaGdF<sub>4</sub> nanoparticles. The Zeeman effect induced by magnetic field is clearly observed from the shift of luminescence bands and the splitting of the emission peaks. Furthermore, the luminescence intensity of different transitions of Eu<sup>3+</sup> in paramagnetic NaGdF<sub>4</sub> exhibits a hysteresis behavior when the magnetic field is scanned between 0 and 40 T. Compared with the optical behavior of Eu<sup>3+</sup> in the nonmagnetic NaYF<sub>4</sub>, this optical hysteresis behavior of luminescence intensity is tentatively ascribed to the magnetic response of the paramagnetic dopant ions in both hosts. Due to the high magnetic field sensitivity, the Eu<sup>3+</sup>-doped bifunctional nanoparticles could be used as optical probes in sensor and biomedical areas

    MOESM1 of A novel rejuvenation approach to induce endohormones and improve rhizogenesis in mature Juglans tree

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    Additional file 1. This file contains two figures as follows. Figure S1. Controls of endohormone immunolocalization technique. Figure S2. Comparison of Fig. 6a and f

    Linear and Nonlinear Optical Properties of Silver-Coated Gold Nanorods

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    Silver-coated gold nanorods (GNRs) with large longitudinal surface plasmon resonance (SPR) wavelength tunability were fabricated by depositing silver (Ag) on the surface of GNRs. Linear and third-order optical nonlinear properties together with the ultrafast response time of these nanorods were investigated. The results demonstrate that the longitudinal SPR wavelength of GNRs is very sensitive to the thickness (<i>t</i><sub>Ag</sub>) of the Ag coating layer, which changes the dielectric constant of the environment. As <i>t</i><sub>Ag</sub> increases from 0 to 15 nm, the SPR wavelength decreases dramatically from 840 to 520 nm, the corresponding wavelength-dependent third-order optical susceptibility changes dependently with the changing of the SPR absorption curve while the one-photon and two-photon figures of merit were required for optical switching applications, and the ultrafast response time also changes continuously with varying SPR wavelength. These observations are important for applications of plasmonic structures in ultrafast wavelength division multiplexing devices
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