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arXiv 1302.1807physics.opticsquant-ph
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用于近量子限制运动转换的纳米级光机械腔的光耦合

Optical coupling to nanoscale optomechanical cavities for near quantum-limited motion transduction

Justin D. Cohen, Sean Meenehan, Oskar Painter

摘要:

作为量子实验和经典计量学的测试平台的芯片级腔光学机械装置的发展中的一个重大挑战在于将来自纳米级光学模体积的光耦合到传统的光学元件,例如透镜和光纤。在这项工作中,我们展示了一个高效率,单面光纤耦合平台的光机械腔。通过在光子晶体拉链腔和固定光纤之间引入一个绝热波导锥来实现单模转换,在腔谐振波长为1538nm处,实现了52%的腔内光子收集效率。在3.3 MHz的基本面内机械共振的位移波动的光学平衡零差测量表明,不精确的噪声地板在于一个因素的2.8以上的标准量子限制(SQL)连续位置测量,与预测的总增加噪声的1.4声子在最佳的探测功率。极低的测量噪声和强大的光纤对准的组合提出了对这些类型的集成微光机械腔的单声子灵敏度的重大进展。

英文摘要:

A significant challenge in the development of chip-scale cavity-optomechanical devices as testbeds for quantum experiments and classical metrology lies in the coupling of light from nanoscale optical mode volumes to conventional optical components such as lenses and fibers. In this work we demonstrate a high-efficiency, single-sided fiber-optic coupling platform for optomechanical cavities. By utilizing an adiabatic waveguide taper to transform a single optical mode between a photonic crystal zipper cavity and a permanently mounted fiber, we achieve a collection efficiency for intracavity photons of 52% at the cavity resonance wavelength of 1538nm. An optical balanced homodyne measurement of the displacement fluctuations of the fundamental in-plane mechanical resonance at 3.3 MHz reveals that the imprecision noise floor lies a factor of 2.8 above the standard quantum limit (SQL) for continuous position measurement, with a predicted total added noise of 1.4 phonons at the optimal probe power. The combination of extremely low measurement noise and robust fiber alignment presents significant progress towards single-phonon sensitivity for these sorts of integrated micro-optomechanical cavities.

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