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Rare-earth doped fluoride glass particles as three-dimensional near-field optical sensors

Author: Aigouy L.   Mortier M.   Giérak J.   Bourhis E.  

Publisher: Society of Glass Technology

ISSN: 0031-9090

Source: Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Vol.47, Iss.2, 2006-04, pp. : 83-87

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Abstract

Fluoride glass materials doped with erbium and codoped with ytterbium ions readily absorb infrared light near 1 μm and emit strong visible light via several possible nonlinear upconversion processes (e.g. two photons absorption results in green light emission and three photons absorption results in blue light emission). We have utilised such a material in the form of a submicrometer particle, as a nano-optical sensor. The particle is first glued to the end of an atomic force microscope (AFM) tip using a nanomanipulator and its size is reduced using a focused ion beam (FIB) instrument. By monitoring the fluorescence output of the particle while it is scanned over a nanostructured sample illuminated with a laser beam at 980 nm, we can indirectly measure the electromagnetic field distribution on the sample. In the current work, we'll present some optical images obtained from 500 nm diameter nanoholes made in a thin gold film. We show that this probe can also be used to image the electromagnetic field in a plane perpendicular to the surface showing the high confinement of light near the nano-apertures.

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