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Complex-plasma manipulation by radiofrequency biasing

机译：射频偏置的复杂等离子体处理

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This paper presents an experimental study on the nature, the dimensions and the timescale of the perturbation introduced by radiofrequency (rf) biasing of areas adjacent to the plasma. The analysis of the rf sheath, and of the charging of particles in it, has disclosed a levitation force on particles, which is substantially different from the dc one often used in complex plasmas. Experimentally, the rf heavily loaded sheath presents characteristics completely different from the normal case V-rf less than or equal to V-dc. Regions of extra ionization and complex electrostatic structures arise. These have been visualized by nanoparticles grown in the plasma. A variety of equilibrium positions for a controlled number of microparticles (injected) can be achieved by fine balancing of dc and rf on a pixel with the neighbouring sheath kept under control. In certain situations gravity is completely compensated, allowing the study of three-dimensional clusters. The motion of clusters from 4 to about 100 particles is simultaneously monitored by a three-dimensional visualization based on two laser lights modulated in intensity. This method enables the study of time-varying effects, such as transitions and vibrations, as well as the study of static structures and lattice defects. At pressures below 40 Pa in large clusters a poloidal motion appears.
机译：本文对由等离子体附近区域的射频（rf）偏压引入的扰动的性质，尺寸和时间尺度进行了实验研究。射频鞘管及其中的粒子带电的分析已经揭示了粒子上的悬浮力，这与复杂等离子体中经常使用的直流电有很大不同。实验上，射频重负荷护套表现出的特性与正常情况下的V-rf完全小于或等于V-dc。产生额外电离和复杂静电结构的区域。这些已经通过在血浆中生长的纳米颗粒被可视化了。通过控制像素上的dc和rf的精细平衡，并使相邻鞘层处于受控状态，可以实现受控数量的微粒（注入）的各种平衡位置。在某些情况下，重力可以完全补偿，从而可以研究三维星团。通过基于强度调制的两个激光的三维可视化，可以同时监视从4个粒子到大约100个粒子的簇的运动。这种方法可以研究时变效应，例如过渡和振动，以及静态结构和晶格缺陷。在大簇中低于40 Pa的压力下会出现极向运动。

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