Open AccessExploring bandgap generation mechanism of phonon crystal
Author(s) -
Chiming Wang,
Wangqiang Xiao,
Dehui Wu,
Changming Lin,
Jingjing Xiao,
Kaihan Yao,
Yuanyi Luo,
Zhanhao Xu,
Xiaoying Zhang
Publication year - 2020
Publication title -
new journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.584
H-Index - 190
ISSN - 1367-2630
DOI - 10.1088/1367-2630/ab60ef
Subject(s) - physics , superposition principle , phonon , vibration , resonance (particle physics) , band gap , condensed matter physics , modal analysis , crystal structure , normal mode , mode (computer interface) , modal , crystal (programming language) , optics , quantum mechanics , materials science , crystallography , computer science , programming language , chemistry , polymer chemistry , operating system
In this paper, based on the theoretical research of structural modal analysis, different types of phonon crystal modal structures are designed for the first time, and the characteristics and the generation mechanism of the bandgap were studied through theoretical calculations and experiments. According to the phenomenon in the experimental results, we can find that the vibration transmission characteristics of phonon crystal structure α 3 are the best, and it is also superior to that of phonon crystal structure α 10 (full period structure). Therefore, the comparison of theoretical analysis with experimental phenomena shows that the bandgap generation mechanism should be modal resonance instead of local resonance in the finite periodic structure. The profound reason lies in there is no separate Z direction local vibration mode of periodic structure in the vibration mode of finite structure, and the bandgap of finite structure is the mode superposition torsional resonance mechanism between scatterer and substrate mode.