Optical rotation of levitated spheres in high vacuum
Optical rotation of levitated spheres in high vacuum
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DOI：
10.1103/physreva.97.051802
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发表时间：
2018-05-31
影响因子：
2.9
通讯作者：
Moore, David C.
中科院分区：
文献类型：
--
作者：
Monteiro, Fernando;Ghosh, Sumita;Moore, David C.
利用圆偏振激光束在高真空中悬浮和控制微球的旋转。在低压下，旋转频率高达6 MHz的双折射球霰石球体，由离心应力的限制。由于在高真空中的极低阻尼，在几MHz以上的速率下也观察到非晶SiO_2球的受控旋光。在10（-7）毫巴下，对于10 μ m直径的SiO2球，测得阻尼时间为6 × 10（4）s。没有额外的阻尼机制，观察以上气体阻尼，表明甚至更长的阻尼时间可能是possiblewith操作在较低的压力。在MHz频率下具有低阻尼的微球的受控旋光，包括对于非固有双折射的材料，提供了使用光学悬浮系统进行精确测量的工具。
A circularly polarized laser beam is used to levitate and control the rotation of microspheres in high vacuum. At low pressure, rotation frequencies as high as 6 MHz are observed for birefringent vaterite spheres, limited by centrifugal stresses. Due to the extremely low damping in high vacuum, the controlled optical rotation of amorphous SiO2 spheres is also observed at rates above severalMHz. At 10(-7) mbar, a damping time of 6 x 10(4) s is measured for a 10-mu m-diam SiO2 sphere. No additional damping mechanisms are observed above gas damping, indicating that even longer damping times may be possiblewith operation at lower pressure. The controlled optical rotation of microspheres at MHz frequencies with low damping, including for materials that are not intrinsically birefringent, provides a tool for performing precision measurements using optically levitated systems.