In this work, the fabrication and optical properties of a planar waveguide in a neodymium-doped calcium niobium gallium garnet （Nd：CNGG） crystal are reported. The waveguide is produced by proton （H＋） implantation at 480 keV and a fluence of 1.0x 10^17 ions/cm2. The prism-coupling measurement is performed to obtain the dark mode of the waveguide at a wavelength of 632.8 nm. The reflectivity calculation method （RCM） is used to reconstruct the refractive index profile. The finite-difference beam propagation method （FD-BPM） is employed to calculate the guided mode profile of the waveguide. The stopping and range of ions in matter 2010 （SRIM 2010） code is used to simulate the damage profile induced by the ion implantation. The experimental and theoretical results indicate that the waveguide can confine the light propagation.
A series of neodymium-doped lanthanum fluoride nanoparticles （NPs） were synthesized with hydrothermal method, and the effects of several ligands on the luminescence properties of the NPs were investigated. The X-ray diffraction （XRD） results indicated that the crystal phases of the modified NPs coincided with the standard spectrum. The transmission electron microscopy （TEM） showed that the samples were of similar size, shape and dispersibility. The infi＇ared spectra suggested that the content of-OH groups as quenchers on the NPs surfaces decreased after modification. Compared with NPs modified by branched paraffin ligands, NPs conjugating ring-contained modifiers had less quenching effect and possessed stronger fluorescence intensity and longer fluorescence lifetime.
