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首页> 外文期刊>Applied optics >Circular acoustogyration effect on gold nanoparticles grown on indium tin oxide
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Circular acoustogyration effect on gold nanoparticles grown on indium tin oxide

机译：圆形声旋转对铟锡氧化物上生长的金纳米粒子的影响

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摘要

Gold nanoparticles deposited on indium-tin-oxide coated substrates show substantial circularly polarized acoustically induced light gyration (AILG) at liquid-helium temperature. The effect was observed only during simultaneous treatment by two coherent acoustic waves with basic frequencies of 0.8-1.6 MHz and corresponding coherent double-frequency acoustical components. It was found that increasing the basic acoustical frequency to 1.6 MHz led to suppression of the effect. A Ti:sapphire laser with a pulse duration of approximately 80 fs allowed us to achieve the maximal value for the AILG. Enhancement of the pulse duration higher than 200 fs also substantially diminished the effect. The maximally achieved value of the AILG susceptibility (described by a fourth-order axial tensor) caused by the circularly polarized acoustical probe field at an acoustical power density of approximately 3 W/cm~(2) at T velence 4.2 K was equal to approximately 7.8 deg/mm for the circular acoustical wave polarization. The maximal AILG coefficient is achieved for samples that possess minimal resistivity. The investigated composites possess an acoustically induced helicoidal grating that disappeared 20 s after switching off the acoustical fields.
机译：沉积在氧化铟锡涂层基底上的金纳米粒子在液氦温度下显示出基本的圆极化声感应光旋转（AILG）。仅在同时处理两个基频为0.8-1.6 MHz的相干声波和相应的相干双频声分量的情况下，才观察到这种效果。已经发现，将基本声频增加到1.6MHz导致了对该效果的抑制。脉冲持续时间约为80 fs的Ti：蓝宝石激光器使我们能够获得AILG的最大值。脉冲持续时间高于200 fs的增强也大大降低了效果。在T velence 4.2 K处，在约3 W / cm〜（2）的声功率密度下，圆极化声探针场引起的AILG磁化率的最大值（由四阶轴向张量描述）等于圆形声波极化为7.8度/毫米。对于具有最小电阻率的样品，可以获得最大AILG系数。被研究的复合材料具有声诱发的螺旋光栅，在关闭声场后20 s消失。

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