Locally resonant phononic crystals band-gap analysis on a two dimensional phononic crystal with a square and a triangular lattice
| Autor: | Khouloud Sellami, Hassiba Ketata, Mohamed Hédi Ben Ghozlen |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Condensed matter physics Band gap Plane wave expansion method 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Square (algebra) Rod Electronic Optical and Magnetic Materials 010309 optics Crystal 0103 physical sciences Hexagonal lattice Electrical and Electronic Engineering 0210 nano-technology Electronic band structure Bloch wave |
| Zdroj: | Optical and Quantum Electronics. 51 |
| ISSN: | 1572-817X 0306-8919 |
| DOI: | 10.1007/s11082-019-2028-0 |
| Popis: | Locally resonant phononic crystals (LRPC) are a new type of sound insulating material. Using the plane wave expansion method based on the Bloch theorem, we compute the band structure of two dimensional (2D) phononic crystals (PC) with square and triangular lattices. Such PC typically consists of infinitely long carbon rods coated with silicon rubber and embedded in an elastic background. Computational results show that gaps appear at the lower frequency range, which are lower than those expected from the Bragg mechanism. Those gaps are generated due to local resonances; the optimum gap is obtained by tuning the thickness ratio of the coating layer. The gap created by the LRPC depends on the filling fraction of the coating cylinders. |
| Databáze: | OpenAIRE |
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