Volume 109, Number 1, January 2015
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||16 January 2015|
An acoustic beam shifter with enhanced transmission using perforated metamaterials
1 Department of Physics and Materials Science, City University of Hong Kong - Tat Chee Avenue, Kowloon Tong, Hong Kong
2 College of Electronic Science and Technology, Shenzhen University - Shenzhen, PRC
3 School of Physics and Astronomy, University of Birmingham - Birmingham B15 2TT, UK
4 Shenzhen Research Institute, City University of Hong Kong - Shenzhen, PRC
Received: 20 October 2014
Accepted: 19 December 2014
We experimentally demonstrate an acoustic beam shifter with enhanced transmission based on subwavelength perforated metamaterials with a wide working frequency range from 2.8 to 4.6 kHz. An oblique perforation angle allows a flexible beam shifting distance and negative refraction for one side of incidence angles. While the beam shifting action is broadband due to the geometric nature of design, beam shifting with enhanced efficiency is found at the frequency with Fabry-Pérot (FP) resonance through a two-dimensional pressure field mapping. Such a method in combining extraordinary transmission and beam shifting with properly designed metamaterials, enables designing flexible and also transformation acoustic devices with high transmission efficiency in a general context.
PACS: 43.20.+g – General linear acoustics / 43.35.+d – Ultrasonics, quantum acoustics, and physical effects of sound / 46.40.Cd – Mechanical wave propagation (including diffraction, scattering, and dispersion)
© EPLA, 2015
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