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In the last two decades, a remarkable progress has occurred in the development of biosensor photonic devices and their application in areas ranging from environmental monitoring to food safety, medical diagnostics, drug screening. As an example, recent developments have greatly improved the sensitivity of optical sensors based on metal nanoparticle arrays and single nanoparticles; plasmonic nanosensors...
Sol-gel route is employed to prepare three nanostructured systems, namely core-shell Er3+-activated silica particles, Er3+-activated silica inverse opal; and spherical microresonators coated by Er3+-activated silica-hafnia film. Fabrication protocol, morphology, and spectroscopic assessment are presented. All the structures exhibit high compositional homogeneity leading to a significant 4I13/2 luminescence...
Sol gel-derived silica-hafnia is a reliable and flexible binary system that has proved to be suitable for rare earth doping and fabrication of amorphous and glass ceramic planar waveguides as well as for improving thermal stability of spherical microresonators. Here we present an overview concerning fabrication protocols and structural, optical and spectroscopic assessment of SiO2-HfO2 waveguides...
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