| Issue |
EPL
Volume 87, Number 5, September 2009
|
|
|---|---|---|
| Article Number | 57003 | |
| Number of page(s) | 4 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/87/57003 | |
| Published online | 16 September 2009 | |
Far-field focusing of acoustic waves by a two-dimensional phononic crystal with surface grating
1
Key Lab of Acoustic and Photonic Materials and Devices of Ministry of Education and Department of Physics, Wuhan University - Wuhan 430072, China
2
Department of Physics, Center South University - Changsha 410073, China
Corresponding author: zyliu@whu.edu.cn
Received:
16
May
2009
Accepted:
18
August
2009
We show that by adding a surface grating onto a two-dimensional phononic crystal slab, negative refraction of acoustic waves can be observed in the originally forbidden frequency region. Far-field focusing by this mechanism is demonstrated with exact numerical simulations, which is in agreement with the physical analysis based on the wave-beam negative-refraction law. Potential applications of the effect in acoustic devices are expected.
PACS: 78.20.Ci – Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity) / 43.20.+g – General linear acoustics / 43.58.+z – Acoustical measurements and instrumentation
© EPLA, 2009
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