Open AccessThe influence of point defect array on directional emission of phononic crystal waveguide
Author(s) -
Wei Qi,
Cheng Ying,
Xiaojun Liu
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.124301
Subject(s) - directivity , waveguide , materials science , optics , radiation , crystal (programming language) , point (geometry) , acoustics , physics , telecommunications , geometry , mathematics , computer science , antenna (radio) , programming language
A novel composite waveguide is proposed to improve the directional emission of phononic crystal waveguide by introducing a point defect array. The finite element simulations indicate that the point defects attached to the output surface of phononic crystal waveguide produce resonant modes, which act as secondary radiation sources. The interferences of sound wave radiated from these radiation sources and waveguide can enhance the normal radiation intensity by 161.21% and reduce the half-power angular width by 85.35%. In addition, when the number of the point defects is large enough, the directivity approaches a steady value. The investigation provides a new method to improve the directional emission of phononic crystal waveguide.