Fig. 1.

Multimode optomechanical system. (A) Optical setup, in which a low-noise Ti:S laser with modulation sidebands from an electro-optic modulator (EOM) pumps a Fabry–Perot resonator held in a cryostat. The resonator contains the sample chip (M) with the nanomechanical membrane and two spacer chips (S). (B) Tuning of optical resonator linewidth and frequency with membrane position with respect to the wavelength, which was changed in this experiment (varied around 810 nm). Solid lines are theoretical TMM predictions (SI Appendix). (C) Dark-field images of two mechanical modes.