3 research outputs found
Magnetic Tuning of Optical Hysteresis Behavior in Lanthanide-Doped Nanoparticles
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
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
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