Nonlinear interaction of compressional waves in a 2D dusty plasma crystal.
Nonlinear interaction of compressional waves in a 2D dusty plasma crystal.
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DOI：
10.1103/physrevlett.92.085001
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发表时间：
2004-02
影响因子：
8.6
通讯作者：
V. Nosenko;K. Avinash;J. Goree;B. Liu
中科院分区：
文献类型：
--
作者：
V. Nosenko;K. Avinash;J. Goree;B. Liu
在二维汤川（屏蔽库仑）三角晶格中研究了压缩波的非线性混合和谐波产生。该晶格是悬浮在等离子体鞘中的单层高电荷聚合物微球。通过用调制的 Ar+ 激光束推动粒子，在晶格中激发两个不同频率的正弦波。观察到和频、差频以及谐波的波在晶格中传播。正如理论所预测的那样，由于摩擦阻尼，声子仅在高于激励功率阈值时才会发生非线性相互作用。
Nonlinear mixing and harmonic generation of compressional waves were studied in a 2D Yukawa (screened Coulomb) triangular lattice. The lattice was a monolayer of highly charged polymer microspheres levitated in a plasma sheath. Two sinusoidal waves with different frequencies were excited in the lattice by pushing the particles with modulated Ar+ laser beams. Waves at the sum and difference frequencies and harmonics were observed propagating in the lattice. Phonons interacted nonlinearly only above an excitation-power threshold due to frictional damping, as predicted by theory.