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Enhanced Optomechanical Levitation of Minimally Supported Dielectrics

zqyin 添加于 2014-12-25 10:14 | 1232 次阅读 | 0 个评论

作者
Müller T, Reinhardt C, Sankey JC
摘要
Optically levitated mechanical sensors promise isolation from thermal noise far beyond what is possible using flexible materials alone. One way to access this potential is to apply a strong optical trap to a minimally supported mechanical element, thereby increasing its quality factor Q. Current schemes, however, require prohibitively high laser power (~10 W), and the Q enhancement is ultimately limited to a factor of ~50 by hybridization between the trapped mode and the dissipative modes of the supporting structure. Here we propose a levitation scheme taking full advantage of an optical resonator to reduce the circulating power requirements by many orders of magnitude. Applying this scheme to the case of a dielectric disk in a Fabry-Perot cavity, we find a simple tilt-based tuning mechanism for optimizing both center-of-mass and torsional mode traps. Notably, the two modes are trapped with comparable efficiency, and we estimate that (e.g.) a 10-micron-diameter, 100-nm-thick Si disc could be trapped to a frequency of 10 MHz with only 30 mW circulating in a cavity of modest finesse 1500. Finally, we simulate the effect such a strong trap would have on a realistic doubly-tethered disc. Of central importance, we find torsional motion is comparatively immune to Q-limiting hybridization, allowing a Q enhancement factor of ~1500. This opens the possibility of realizing a laser-tuned 10 MHz mechanical system with a quality factor exceeding a billion.
详细资料
- 关键词: quant-ph; cond-mat.mes-hall
- 文献种类:手稿
- 期卷页: 2014年
- 日期: 2014-12-25
- 发布方式: arXiv e-prints
- 备注:arXiv:1412.7733v1; 10 pages, 6 figures
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