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Title: Formation of Bragg band gaps in anisotropic phononic crystals analyzed with the empty lattice model

Journal Article · · Crystals
DOI:https://doi.org/10.3390/cryst6050052· OSTI ID:1282889
 [1];  [2]; ORCiD logo [1]
  1. Univ. de Franche-Comte, Besancon (France). Franche-Comte Electronics Thermal Mechanics and Optics
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Chemistry

Bragg band gaps of phononic crystals generally, but not always, open at Brillouin zone boundaries. The commonly accepted explanation stems from the empty lattice model: assuming a small material contrast between the constituents of the unit cell, avoided crossings in the phononic band structure appear at frequencies and wavenumbers corresponding to band intersections; for scalar waves the lowest intersections coincide with boundaries of the first Brillouin zone. However, if a phononic crystal contains elastically anisotropic materials, its overall symmetry is not dictated solely by the lattice symmetry. We construct an empty lattice model for phononic crystals made of isotropic and anisotropic materials, based on their slowness curves. We find that, in the anisotropic case, avoided crossings generally do not appear at the boundaries of traditionally defined Brillouin zones. Furthermore, the Bragg "planes" which give rise to phononic band gaps, are generally not flat planes but curved surfaces. Lastly, the same is found to be the case for avoided crossings between shear (transverse) and longitudinal bands in the isotropic case.

Research Organization:
Univ. of Franche-Comte, Besancon (France); Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0001299; FG02-09ER46577
OSTI ID:
1282889
Journal Information:
Crystals, Vol. 6, Issue 5; ISSN 2073-4352
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (3)

Topological Optimization of Phononic Crystal Thin Plate by a Genetic Algorithm journal June 2019
Surface acoustic wave modes in two-dimensional shallow void inclusion phononic crystals on GaAs journal July 2019
All-acoustic signal modulation and logic operation via defect induced cavity effects in phononic crystal coupled-resonator acoustic waveguides journal November 2019