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Force sensitivity of multilayer graphene optomechanical devices.
P Weber1, J Güttinger1, A Noury1
1ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels (Barcelona) 08860, Spain.
Nature Communications
|August 10, 2016
Summary
Researchers coupled multilayer graphene resonators to superconducting cavities, achieving unprecedented displacement sensitivity for ultrasensitive force and mass sensing. This breakthrough enables advanced studies of graphene properties and adsorbed molecular spins.
Area of Science:
- Physics
- Materials Science
- Nanotechnology
Background:
- Mechanical resonators using low-dimensional materials show potential for precise force and mass sensing.
- Key limitations include measurement imprecision, resonant frequency fluctuations, and measurement-induced heating.
Purpose of the Study:
- To enhance force and mass sensing capabilities using multilayer graphene resonators.
- To overcome limitations in displacement sensitivity and measurement-induced heating.
Main Methods:
- Strongly coupling multilayer graphene resonators to superconducting cavities.
- Utilizing optomechanical damping to reduce resonator vibrations.
- Carefully balancing measurement imprecision, damping, and heating effects.
Main Results:
- Achieved a displacement sensitivity of 1.3 fm Hz(-1/2).
- Reduced resonator to an average phonon occupation of 7.2.
- Obtained a force sensitivity of 390 zN Hz(-1/2) with a 200 Hz bandwidth.
Conclusions:
- The developed optomechanical system significantly improves sensitivity for force and mass sensing.
- This platform is suitable for investigating quantum capacitance, magnetization, and molecular spin properties of graphene.
