Optomechanics for thermal characterization of suspended graphene
Robin Dolleman (TU Delft - QN/Steeneken Lab, Kavli institute of nanoscience Delft)
S. Houri (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)
Dejan Davidovikj (TU Delft - QN/Steeneken Lab, Kavli institute of nanoscience Delft)
S.J. Cartamil Bueno (Kavli institute of nanoscience Delft, TU Delft - QN/Steeneken Lab)
IM Blanter (Kavli institute of nanoscience Delft, TU Delft - QN/Blanter Group)
Herre S J van der Zant (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)
Peter Steeneken (TU Delft - Dynamics of Micro and Nano Systems, TU Delft - QN/Steeneken Lab, Kavli institute of nanoscience Delft)
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Abstract
The thermal response of graphene is expected to be extremely fast due to its low heat capacity and high thermal conductivity. In this work, the thermal response of suspended single-layer graphene membranes is investigated by characterization of their mechanical motion in response to a high-frequency modulated laser. A characteristic delay time τ between the optical intensity and mechanical motion is observed, which is attributed to the time required to raise the temperature of the membrane. We find, however, that the measured time constants are significantly larger than the predicted ones based on values of the specific heat and thermal conductivity. In order to explain the discrepancy between measured and modeled τ, a model is proposed that takes a thermal boundary resistance at the edge of the graphene drum into account. The measurements provide a noninvasive way to characterize thermal properties of suspended atomically thin membranes, providing information that can be hard to obtain by other means.
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