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In this paper we propose a method to overcome one the major fundamental limitation of silica spherical micro resonators for frequency reference, i.e. temperature stabilization, by coating the micro resonator with an appropriate material through the use of an innovative sol-gel method. We experimentally characterize the thermal drift of a resonant frequency of a silica microsphere coated by a Polymethyl...
Paper reports recent advances in optical nanomaterials, planar microcavity, and spherical microresonators. Bottom-up fabrication and optical assessment of Er3+-activated SiO2-HfO2 waveguide glass ceramic is presented. Concerning confined structures, fabrication by radio-frequency sputtering (RFS) technique of an Er3+-activated microcavity with a quality factor of 171 using oxide-based dielectric materials...
The aim of this lecture is to highlight some advances in erbium-activated silica-based photonic systems, where suitable geometries and appropriate fabrication protocols allow tailoring and enhancement of optical and spectroscopic properties. In particular, the following topics are presented: (i) rare earth-activated glass ceramics planar waveguides; (ii) Er3+-activated Ag exchanged silicate glass;...
Er3+ active 3D photonic crystal in direct and inverse opal configuration were realized, on silica substrate, by sol-gel routes. The optical properties were investigated by means reflectance measurements at different incidence angles. From optical measurements it's evident that both structures (direct and inverse opals) exhibited a pseudo photonic band gap in the visible range. In fact a reflective...
SiO2-HfO2: Er3+-Yb3+ waveguide was prepared by multi-target rf-sputtering technique on silica substrate. The optical parameters were measured by an m-line apparatus operating at 543.5, 632.8, 1319 and 1542 nm. The structural properties were investigated with energy dispersive spectroscopy and Raman spectroscopy. The planar waveguide had a single-mode at 1.3 and 1.5 mum and an attenuation coefficient...
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