光诱导自旋波的单向控制
Unidirectional control of optically induced spin waves
摘要：
研究了稀土铁石榴石晶体中光致自旋波的单向控制。我们观察到圆偏振光脉冲产生的两个初相位不同的自旋波包的干涉。如果自旋波源以自旋波波长的1/4间隔开并且初始相位差被设置为π/2，则这种干涉导致单向传播。光脉冲的偏振螺旋度改变了自旋波的传播方向。此外，在数值模拟中，应用两个以上的自旋波源具有合适的偏振和斑点形状，任意操纵的自旋波的相控阵列方法被复制。
英文摘要：
Unidirectional control of optically induced spin waves in a rare-earth iron garnet crystal is demonstrated. We observed the interference of two spin-wave packets with different initial phases generated by circularly polarized light pulses. This interference results in unidirectional propagation if the spin-wave sources are spaced apart at 1/4 of the wavelength of the spin waves and the initial phase difference is set to pi/2. The propagating direction of the spin wave is switched by the polarization helicity of the light pulses. Moreover, in a numerical simulation, applying more than two spin-wave sources with a suitable polarization and spot shape, arbitrary manipulation of the spin wave by the phased array method was replicated.
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