We demonstrate strong coupling between the flexural vibration modes of a clamped-clamped micromechanical resonator vibrating at low amplitudes. This coupling enables the direct measurement of the frequency response via amplitude- and phase modulation schemes using the fundamental mode as a mechanical detector. In the linear regime, a frequency shift of 0.8Hz is observed for a mode with a line width of 5.8Hz in vacuum. The measured response is well-described by the analytical model based on the Euler-Bernoulli beam including tension. Calculations predict an upper limit for the room-temperature Q-factor of 4.5×105 for our top-down fabricated micromechanical beam resonators.
@article{arxiv.1207.1594,
title = {Strongly coupled modes in a weakly driven micromechanical resonator},
author = {W. J. Venstra and R. van Leeuwen and H. S. J. van der Zant},
journal= {arXiv preprint arXiv:1207.1594},
year = {2013}
}