Leijssen Rick, Verhagen Ewold
Center for Nanophotonics, FOM Institute AMOLF, Science Park 104, 1098 XG, Amsterdam, The Netherlands.
Sci Rep. 2015 Nov 2;5:15974. doi: 10.1038/srep15974.
Coupling between mechanical and optical degrees of freedom is strongly enhanced by using subwavelength optical mode profiles. We realize an optomechanical system based on a sliced photonic crystal nanobeam, which combines such highly confined optical fields with a low-mass mechanical mode. Analyzing the transduction of motion and effects of radiation pressure we find the system exhibits a photon-phonon coupling rate g0 /2π ≈ 11.5 MHz, exceeding previously reported values by an order of magnitude. We show that the large optomechanical interaction enables detecting thermal motion with detection noise below that at the standard quantum limit, even in broad bandwidth devices, important for both sensor applications as well as measurement-based quantum control.
通过使用亚波长光学模式分布，机械自由度和光学自由度之间的耦合得到了显著增强。我们基于切片光子晶体纳米梁实现了一个光机械系统，该系统将这种高度受限的光场与低质量的机械模式相结合。通过分析运动的转换和辐射压力的影响，我们发现该系统表现出光子 - 声子耦合率(g_0/2\pi\approx11.5)兆赫兹，比先前报道的值高出一个数量级。我们表明，即使在宽带宽器件中，这种大的光机械相互作用也能够检测热运动，其检测噪声低于标准量子极限，这对于传感器应用以及基于测量的量子控制都很重要。
