The manipulation of self-collimated beam in phononic crystals composed of orientated rectangular inclusions
| Autor: | Chia Nien Tsai, Lien Wen Chen |
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| Rok vydání: | 2016 |
| Předmět: |
Diffraction
Materials science Straight path Computer simulation Wave propagation business.industry Physics::Medical Physics Bandwidth (signal processing) 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology 01 natural sciences Finite element method Collimated light Optics 0103 physical sciences Acoustic metamaterials Physics::Accelerator Physics General Materials Science 010306 general physics 0210 nano-technology business |
| Zdroj: | Applied Physics A. 122 |
| ISSN: | 1432-0630 0947-8396 |
| Popis: | Self-collimation is wave propagation in straight path without diffraction. The performance is evaluated by bandwidth, angular collimating range and straightness of equi-frequency contours. The present study aims to manipulate the self-collimated beam in square-array phononic crystals by means of orientated rectangular inclusions. Finite element simulations are performed to investigate the effects of the aspect ratio and orientation angle of rectangular inclusions on the self-collimated beam. The simulation results show that the proposed design successfully achieves all-angle self-collimation phenomenon. In addition, it also shows that the propagation direction of a self-collimated beam can be effectively manipulated by varying the orientation angle of inclusions. Numerical simulation result of the S-shaped bend demonstrates that acoustic collimated beam can be steered with negligible diffraction. Overall, the proposed design has significant potential for the realization of applications such as collimators, acoustic waveguides and other phononic crystals-based systems. |
| Databáze: | OpenAIRE |
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