Abstract
A thin beam of waves usually diverges due to diffraction, which is a limitation of any device using such waves. However, a surface acoustic wave (SAW) on a sphere with an appropriate aperture does not diverge but is collimated, realizing ultra-multiple roundtrips along an equator of the sphere. This effect is caused by the balance between diffraction and focusing on a spherical surface, and it enables realization of high-performance ball SAW sensors.
Original language | English |
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Pages (from-to) | 41-51 |
Number of pages | 11 |
Journal | Electrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi) |
Volume | 168 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2009 Jul 15 |
Keywords
- Multiple roundtrips
- Naturally collimated beam
- Sphere
- Surface acoustic wave
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering