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Optical resonators with high quality factor, i. e. better than 108, can be useful for frequency combs, sensors or oscillators applications. It is not easily reproducible to couple the light from a tapered fiber to a crystalline resonator, compared to coupling a resonator designed on a chip to a ridge defined on the same chip. Therefore, the simulation and optimization of crystalline resonators under straight waveguides, has to be performed. We must also take into account technological constraints of manufacturing. At Nanoscale, coupling makes our optimization more dynamics in term of designing space. At first step of the multi-physic optimization enables to demonstrate that, we can simulate and then find an optimal design. This process is the same for other application using coupled devices. The sensitivity analysis shows a good correlation between the obtained experimental Q-factor and the one obtained with finite element simulation. This optimization process integrate some constraints related to manufacturing process, and thermal analysis of the resonator. This process can actually bring a great support to define better performances in several applications of these resonators by achieving high performances devices to be characterized, or sensors. However, some parameters require a non-continuous domain, chosen between fixed positions, but it make the convergence more complicated to perform.
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