Electrically driven, optically levitated microscopic rotors
Electrically driven, optically levitated microscopic rotors
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DOI：
10.1103/physreva.99.041802
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发表时间：
2018-12
影响因子：
2.9
通讯作者：
Alexander D. Rider;Charles P. Blakemore;A. Kawasaki;N. Priel;Sandip Roy;G. Gratta
中科院分区：
文献类型：
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作者：
Alexander D. Rider;Charles P. Blakemore;A. Kawasaki;N. Priel;Sandip Roy;G. Gratta
报道了半径为2.4 μ m的电悬浮介质微球的电驱动旋转。电场用于将扭矩施加到微球的永久电偶极矩，而微球的角位移通过检测透射通过微球的光的偏振状态的变化来测量。这种技术能够实现比以前用纯光学手段实现的更大的控制。我们测量从旋转电场中释放的微球的自旋下降，偶极子相对于场的瞬时方向的谐波运动，以及驱动电场和MS的偶极矩之间的相位滞后，由于残留气体的阻力。我们还观察到陀螺进动的MS时，旋转轴的驱动场和微球的角动量是正交的。我们表明，这些意见是在定量协议的运动方程。
We report on the electrically-driven rotation of 2.4$~μ$m-radius, optically levitated dielectric microspheres. Electric fields are used to apply torques to a microsphere's permanent electric dipole moment, while angular displacement of the microsphere is measured by detecting the change in polarization state of light transmitted through the microsphere. This technique enables greater control than previously achieved with purely optical means. We measure the spin-down of a microsphere released from a rotating electric field, the harmonic motion of the dipole relative to the instantaneous direction of the field, and the phase lag between the driving electric field and the dipole moment of the MS due to drag from residual gas. We also observe the gyroscopic precession of the MS when the axis of rotation of the driving field and the angular momentum of the microsphere are orthogonal. We show that these observations are in quantitative agreement with the equation of motion.