ICFO-Institut de Ciencies Fotoniques , Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain.
Nano Lett. 2014 May 14;14(5):2854-60. doi: 10.1021/nl500879k. Epub 2014 Apr 23.
Graphene is an attractive material for nanomechanical devices because it allows for exceptional properties, such as high frequencies, quality factors, and low mass. An outstanding challenge, however, has been to obtain large coupling between the motion and external systems for efficient readout and manipulation. Here, we report on a novel approach, in which we capacitively couple a high-Q graphene mechanical resonator (Q ≈ 10(5)) to a superconducting microwave cavity. The initial devices exhibit a large single-photon coupling of ∼10 Hz. Remarkably, we can electrostatically change the graphene equilibrium position and thereby tune the single photon coupling, the mechanical resonance frequency, and the sign and magnitude of the observed Duffing nonlinearity. The strong tunability opens up new possibilities, such as the tuning of the optomechanical coupling strength on a time scale faster than the inverse of the cavity line width. With realistic improvements, it should be possible to enter the regime of quantum optomechanics.
石墨烯是一种有吸引力的纳米机械器件材料，因为它具有出色的性能，如高频率、高品质因数和低质量。然而，一个突出的挑战是如何在运动和外部系统之间获得大的耦合，以实现高效的读出和操控。在这里，我们报告了一种新的方法，其中我们将高 Q 值的石墨烯机械谐振器（Q ≈ 10(5)）电容耦合到超导微波腔上。初始器件表现出约 10 Hz 的大单光子耦合。值得注意的是，我们可以通过静电改变石墨烯的平衡位置，从而调谐单光子耦合、机械共振频率以及观察到的杜芬非线性的符号和大小。这种强可调性开辟了新的可能性，例如在比腔线宽的倒数更快的时间尺度上调谐光机械耦合强度。通过现实的改进，应该有可能进入量子光学机械学的领域。
