[06月12日]Watching acoustic waves confined in cavities

题　目：Watching acoustic waves confined in cavities
报告人：Oliver B. Wright 教授，日本北海道大学（olly@eng.hokudai.ac.jp）
时　间🧙🏻：6月12日（周一 ）🧘🏼‍♀️，上午10:00-11:00
地　点：意昂4平台南校区第一实验楼423会议室

报告摘要🤚🏼：

Keywords: picosecond, optical scattering, fiber, acoustic-optic, ultrasonics, phononic crystal, metamaterial, cavity, extraordinary transmission

Surface-acoustic and bulk-acoustic-wave wave devices based on waves in resonators have found extensive application in high-frequency signal processing. In particular phononic crystals, metamaterials and micron to sub-micron structures exhibit interesting physical properties, such as omnidirectional stop bands or tight wave confinement, that allow potential improvements to these devices. Here we present results of real-time imaging and tracking of laser-excited acoustic waves at frequencies from 100 MHz up to ~100 GHz in various novel micron-scale cavity geometries: phononic-crystal slab cavity structures, metamaterial extraordinary-transmission structures and sub-micron fibres.

参考文献：

[1] O. B. Wright  and O. Matsuda, Phil. Trans. Roy. Soc. A 373, 20140364 (2015).

[2] P. H. Otsuka, R. Chinbe, M. Tomoda, O. Matsuda, I. A. Veres, J. H. Lee, J. B. Yoon and O. B. Wright, J. Appl. Phys. 117, 245308 (2015)

[3] O. Matsuda, S. Kaneko, O. B. Wright, and M. Tomoda, IEEE Trans. Ultrason.

 Ferroelectr. Freq. Control 62, 584 (2015)

[4] T. Dehoux et al., Light Sci. Appl. 5, 16082 (2016)