We report the experimental observation of the squeezing effect in a graphene mechanical resonator due to an optical actuation force. We fabricate a circular suspended graphene mechanical resonator and measure two quadrature components of the mechanical mode via a phase-locked demodulation technique. By analyzing the correlated distribution of the two components, we find a squeezing effect when increasing the actuation power. We also observe singularity phenomena right at the cut-off frequency, which might be related to the nonlinear effect. Further study is needed to fully understand these phenomena. Our results might find new applications in the fields of sensing and mechanical information processing.
We present an optically assisted frequency modulation (FM) demodulation method to characterize the resonance mode of a graphene resonator. The intensity of a laser at 795 nm is FM demodulated to actuate the graphene resonator, where the carrier frequency is approximately around the resonant frequency of the resonator and the FM deviation is set by the reference signal from the lock-in amplifier. A continuous laser at 633 nm is directed in the sample to perform the optical interferometry technique and the resonance mode of the graphene resonator is extracted through the lock-in amplifier. In this way, resonance modes at high frequencies much larger than the bandwidth of the lock-in amplifier could be detected within a high accuracy. In our configuration, we have obtained the graphene resonance mode at frequencies around 10 MHz with a 100 kHz bandwidth lock-in amplifier.
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