Thanks to the easy fabrication, the possibility to reach very high quality factors, and coating with active or functional materials, silica-based microsphere resonators are becoming one of the more appealing photonic devices for several applications ranging from low-threshold lasers to mechanical and chemical sensing. However, obtaining an efficient coupling between optical fibers and a microspherical resonator, insensible to environmental interferences and with good mechanical stability, is a scientific and technological challenge.
The paper proposes an alternative and innovative coupling technique and characterizes the polarization and temperature dependence of this integrated device. Moreover, the coupling mechanism between the cores of the fiber and the microsphere is explained and modelled.
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