Thin-film microcrystalline diamond micromechanical resonators with mechanical quality factor limited by thermoelastic dissipation in the diamond film are demonstrated. Surface micromachined double ended tuning fork resonators were fabricated from in-situ boron doped microcrystalline diamond films deposited using hot filament chemical vapor deposition. Time-domain thermoreflectance measurements show thermal conductivity of 110 W m−1 K−1 for heat transport through the thickness of the diamond film. Measurement of the quality factor of resonators spanning a frequency range 0.5–10 MHz shows a maximum Q = 81 646 and demonstrates good agreement with quality factor limited by thermoelastic dissipation using 100 W m−1 K−1 for the in-plane thermal conductivity of the diamond film.
Microcrystalline diamond micromechanical resonators with quality factor limited by thermoelastic damping
Hadi Najar, Amir Heidari, Mei-Lin Chan, Hseuh-An Yang, Liwei Lin, David G. Cahill, David A. Horsley; Microcrystalline diamond micromechanical resonators with quality factor limited by thermoelastic damping. Appl. Phys. Lett. 18 February 2013; 102 (7): 071901. https://doi.org/10.1063/1.4793234
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