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Extraordinary applications of phononic metamaterials 
Friday, 23 November 2018, 10:30
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Extraordinary applications of phononic metamaterials

Prof. Oliver Wright

Division of Applied Physics, Faculty of Engineering, Hokkaido University, Sapporo, Japan

Short abstract:

Controlling phonons is essential in a diverse range of applications. Periodic and aperiodic acoustic structures formed of individual acoustic resonators, under conditions in which the acoustic wavelength is much smaller than the resonator spacing, provide a versatile way to block, absorb, guide or transmit phonons, and understanding their behaviour has been the focus of much research. Such structures, known as acoustic or phononic metamaterials, can be constructed from meter down to nanometer length scales.

Here we first present experimental results for highly-efficient, so-called ‘extraordinary’, transmission of audio acoustic waves in a tube, a quasi-1D geometry, and then show how this phenomenon can also be observed on micron to nanometer scales in 2D and 3D geometries with GHz surface-acoustic and bulk phonons, respectively. Related experimental work on the efficient transmission of acoustic waves from water to air through an acoustic metasurface will also be presented. Applications of these phononic metamaterial technologies, from audio frequencies to GHz frequencies, will be explained.

[1] E. Bok, J. J. Park, H. Choi, C. K. Han, O. B.Wright and S. H. Lee, Phys. Rev. Lett. 120, 044302 (2018)
[2] S. Mezil, K. Chonan, P. H. Otsuka, M.Tomoda, O. Matsuda, S. H. Lee and O. B. Wright
Sci. Rep. 6, 33380 (2016)
[3] J. J. Park, K. J. B. Lee, O. B. Wright, M. K. Jung and S. H. Lee
Phys. Rev. Lett. 110, 244302-1-5 (2013)

Location ICN2 Seminar Room
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