Abstract
The quality factor defines the rate with which a nanomechanical resonator dissipates energy. Low energy loss, i.e. a high quality factor, is desirable for most applications of nanomechanical resonators. In this chapter, the three main sources of energy loss in nanomechanical resonators are presented. Energy can be lost (1) to the surrounding medium, which can be a liquid or a gas, (2) through the clamping to the substrate via elastic waves, or (3) through dissipation mechanisms that are intrinsic to the resonator. Medium interaction losses can readily be circumvented by operation in vacuum, and clamping losses can be minimized by an optimized resonator design. This typically leaves intrinsic losses as the limiting mechanism defining the maximal obtainable quality factor. Intrinsic losses consist of material friction and fundamental loss mechanisms such as thermoelastic loss and phonon–phonon interaction loss. Generally, intrinsic losses can be reduced by decreasing the temperature. Damping dilution reduces the effect of intrinsic loss in resonators under tensile stress, resulting in quality factors up to several million even at room temperature.
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Schmid, S., Villanueva, L.G., Roukes, M.L. (2016). Quality Factor. In: Fundamentals of Nanomechanical Resonators. Springer, Cham. https://doi.org/10.1007/978-3-319-28691-4_2
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