Opto-mechanics with Graphene resonators Harold G. Craighead, Cornell University, DMR 0908634

1. Opto-mechanics with Graphene resonatorsHarold G. Craighead, Cornell University, DMR 0908634 A graphene resonator grown using chemical vapor deposition was assembled on a pre-fabricated gate-source-drain electrode setup. Using electrostatic drive and optical readout of the motion, we investigated the role of gate tuning and photothermal influence on the resonant behavior. Top image The resonant frequency can be tuned by the gate voltage. As the gate bias is varied, the distance between the gate and the graphene is altered, changing the optical cavity characteristics of the graphene-gate Fabry Perot. At appropriate gate voltage and laser power, the graphene recovers enough mechanical energy from the light to set it into self oscillation. By altering the cavity we can also cool the resonator. Optical set up (top). (Inset - graphene resonator). Lower left: increased amplitude with laser power. Right: Frequency vs Gate voltage

2. Opto-mechanics with Graphene resonatorsHarold G. Craighead, Cornell University, DMR 0908634 We wrote a review article on graphene nanoresonators (see cover illustration at left). In 2011-2012 we hosted two REU students – Patrick Yu (2012 Texas Tech) – and Reyu Sakakibara (2011 Berkeley). Patrick is working on graphene-silicon nitride integrated resonators, and Reyu worked on fabricating the graphene devices shown at left. In addition the group has attracted a student Roberto DeAlba who has Mexican American antecedents. "Fabrication and performance of graphene nanoelectromechanical systems," R. A. Barton, J. Parpia, H. G. Craighead, Journal of Vacuum Science and Technology B29, 050801 (2011). doi:10.1116/1.3623419