A picogram- and nanometre-scale photonic-crystal optomechanical cavity
A picogram- and nanometre-scale photonic-crystal optomechanical cavity
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DOI：
10.1038/nature08061
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发表时间：
2009-05-28
期刊：
影响因子：
64.8
通讯作者：
Painter, Oskar
中科院分区：
文献类型：
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作者：
Eichenfield, Matt;Camacho, Ryan;Painter, Oskar
光学腔（1-6）和微波腔（7）中电磁力（辐射压力）引起的动态反作用越来越受到关注（8）。例如，反作用冷却被用作实现宏观机械振荡器的量子基态的手段。光学领域的工作一直围绕着使用辐射压力的毫米或微米尺度的结构。相比之下，在微波器件中，低损耗超导结构已被用于梯度力介导耦合到皮克质量的纳米机械振荡器（7）。在这里，我们描述的光学系统组成的一对特别图案化的纳米级光束，其中光学和机械能同时本地化到一个10微米尺度的体积，并实现大的perphoton光学梯度力的测量。由此产生的规模的每光子力和质量的结构，使腔光学机械制度的探索，其中，例如，结构的机械刚度主要是由内部光场本身提供。除了精密测量和灵敏的力检测（9），纳米光学力学还可以应用于可重构和可调谐光子系统（10），基于光的射频通信（11）以及用于波长转换和光学缓冲的巨大光学非线性的产生（12）。
The dynamic back-action caused by electromagnetic forces (radiation pressure) in optical(1-6) and microwave(7) cavities is of growing interest(8). Back-action cooling, for example, is being pursued as a means of achieving the quantum ground state of macroscopic mechanical oscillators. Work in the optical domain has revolved around millimetre-or micrometre-scale structures using the radiation pressure force. By comparison, in microwave devices, low-loss superconducting structures have been used for gradient-force-mediated coupling to a nanomechanical oscillator of picogram mass(7). Here we describe measurements of an optical system consisting of a pair of specially patterned nanoscale beams in which optical and mechanical energies are simultaneously localized to a cubic-micron-scale volume, and for which large perphoton optical gradient forces are realized. The resulting scale of the per-photon force and the mass of the structure enable the exploration of cavity optomechanical regimes in which, for example, the mechanical rigidity of the structure is dominantly provided by the internal light field itself. In addition to precision measurement and sensitive force detection(9), nano-optomechanics may find application in reconfigurable and tunable photonic systems(10), light-based radio-frequency communication(11) and the generation of giant optical nonlinearities for wavelength conversion and optical buffering(12).