Ultrathin Single Crystal Diamond Nanomechanical Dome Resonators

We present the first nanomechanical resonators microfabricated
in single-crystal diamond. Shell-type resonators only 70 nm thick,
the thinnest single crystal diamond structures produced to date, demonstrate
a high-quality factor (Q ≈ 1000 at room temperature, Q ≈ 20 000 at 10 K) at radio frequencies (50–600
MHz). Quality factor dependence on temperature and frequency suggests
an extrinsic origin to the dominant dissipation mechanism and methods
to further enhance resonator performance.