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We implement a mathematical model able to predict the amplitude variation of the optical field inside a coupled high-Q resonator as a function of the scanning wavelength. Similarly to a Fabry-Perot cavity with its two highly reflecting mirrors, the resonator has two fiber based tap couplers. By fitting experimental data with this model, it is possible to determine the physical characteristics of the...
In this paper, a brief analysis is presented of two critical issues for the full exploitation of the unique properties of microresonators based on Whispering Gallery Modes (WGM), namely the coupling of light into/out-of a WGM resonator (WGMR), and the integration of the WGMR with the light injection system and with other sub-systems (e.g. with microfluidics, in the case of biochemical sensors). The...
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...
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