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首页> 外文期刊>Japanese Journal of Applied Physics. Part 1, Regular Papers, Brief Communications & Review Papers >Real Time Imaging of Surface Acoustic Waves on Crystals and Microstructures
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Real Time Imaging of Surface Acoustic Waves on Crystals and Microstructures

机译:晶体和微结构上表面声波的实时成像

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We have demonstrated a method for real time imaging of surface acoustic waves at frequencies in the 100MHz-1 GHz range with picosecond temporal and micron spatial resolutions using an ultrafast optical pump and probe technique. We have also demonstrated a technique for obtaining the dispersion from a set of images making up a complete spatiotemporal animation. This allows the individual modes excited in the sample to be distinguished. Wave fronts in complex nanostructures can also be mapped. This method shows great promise for the study of the physics of surface acoustic waves in very complicated geometries. One example is in the study of phononic crystals, the acoustic analogue of photonic crystals. Another is in the study of acoustic resonators. Moreover, in principle there are exciting prospects for extension with near-field optical techniques to frequencies up to 10 GHz or above.
机译:我们已经展示了一种使用超快速光泵和探针技术对皮秒声波和微米空间分辨率的100MHz-1 GHz范围内的频率的表面声波进行实时成像的方法。我们还演示了一种用于从组成完整的时空动画的一组图像中获得色散的技术。这可以区分样品中激发的各个模式。复杂纳米结构中的波前也可以绘制出来。这种方法为研究非常复杂的几何形状中的表面声波的物理学提供了广阔的前景。声子晶体的研究就是一个例子,声子晶体是光子晶体的声学类似物。另一个是在声学谐振器的研究中。此外,原则上,利用近场光学技术将频率扩展到10 GHz或更高频率具有令人兴奋的前景。

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