Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 51, Issue 25, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aac3cc
Keywords
lamb-wave; phononic crystal; photoacoustic measurement
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Funding
- National Key R&D Program of China [2017YFA0303700, 2017YFA0305100]
- National Natural Science Foundation of China [11625418, 11134006, 11474158, 11404164, 51702152, 51472114, 51721001]
- Ministry of Science and Technology [2016YFB0700301]
- Natural Science Foundation of Jiangsu Province [BK20140019]
- Priority Academic Program Development of Jiangsu Higher Education (PAPD)
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In this work, we experimentally confirmed an effective Lamb-wave guiding method, which utilizes a localized phononic cavity mode in a 2D phononic crystal. The phononic crystal is created by a periodic distribution of solid pillars built on an elastic plate, while the cavity mode is induced by replacing part of the pillars by the hollow pillars. In the experiments, transmission characteristics of the Lamb-waves within the waveguides are studied comprehensively. Elastic field distributions of the cavity mode are mapped in the deep-subwavelength regime. In geometrical shapes, both a straight waveguide and a bended one are made for practical measurement, demonstrating visually that the elastic energies are well localized around the hollow pillars and can be transported around the bends.
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