Study of Optical and Spectroscopic Properties of Lanthanide-doped Nanorods for Near-field Nanoprobing Applications

Download or read book Study of Optical and Spectroscopic Properties of Lanthanide-doped Nanorods for Near-field Nanoprobing Applications written by Reinaldo Chacon hevia and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lanthanide-doped nanoparticles constitute a versatile family of photoluminescent local nanoprobes. In this work, we study the photoluminescence of Eu3+-doped NaYF4 nanorods characterized by highly polarized spectra. We develop a full theoretical model and paraxial approximation for nanorod dipole emission. We measure the photoluminescence of individual nanorods by fluorescence confocal microscopy and determine some of their intrinsic optical properties. We also determine the nature (electric or magnetic) and orientations of dipoles moments of the optical transitions used for nanoprobing in the visible range.In addition to the full theoretical model and the paraxial approximation, Fourier microscopy provides a third method to determine the dipole moment angle and but also gives access to the efective height of the nanorods. We also clarify the role of the electric and magnetic transition, including Stark sublevels in the formation of the Fourier plane images, in contrast to the literature.Finally, we use the nanorods as probes for the local density of optical states by performing a Drexhage-like experiment. We study the photoluminescence emitted by the nanorods, focusing on the transitions 5D0 →7F1, 5D0 →7F2 and 5D0 →7F4, as a function of the distance to a gold mirror. We determine the branching electric/magnetic ratios, the oscillators strengths and the quantum yield of these transitions. We finally demonstrate that the nanorods can be used as a vectorial probe of the electric and magnetic contributions to the local density of optical states (LDOS).